Hand-Held Radio Interface User s Guide Models: NB-HHRI-01 & WB-HHRI-01

Transcription

1 PROGRAM Hand-Held Radio Interface User s Guide Models: NB-HHRI-01 & WB-HHRI-01 The Hand-Held Radio Interface (HHRI) system is designed to operate Toro computerized central irrigation control systems and field satellites/decoders (except OSMAC) to provide remote manual control operation. The HHRI unit enables most central controlled and satellite manual operations to be accessed remotely from the field through a hand-held two-way radio with numeric DTMF keypad or a touch-tone telephone. Figure 1 shows a step-by-step diagram of the HHRI system communication process. Step 1 - A command is issued through the keypad of the hand-held radio and transmitted to the HHRI unit. (The hand-held radio and the HHRI unit must be programmed to the same radio frequency.) Step 2 - The HHRI unit validates the command and sends it to the PC-based Network central or the TouchNet for Network LTC Plus central. Step 3 - The central signals the satellite or decoder to perform the requested operation. Step 4 - An audio confirmation signal is issued by the HHRI unit back to the hand-held radio. Figure 1 TouchNet Central For LTC Plus Satellite TouchNet Two-Way Hand-Held Radio With DTMF Keypad Hand-Held Radio Interface OR 2 SItePro Central Computer 3 Satellite Controllers Or Decoders Hardware Installation Before installation, the following services must be performed by an authorized Toro representative: Installation site survey to analyze the location for the best radio frequency. Procurement of the radio frequency license from the FCC. Selection of the required antenna type, size and height based on the distance and terrain between the central and areas requiring hand-held manual operations. Selection of the antenna cable type and length required for proper operation. Determining the specific antenna requirement to meet the FCC or local regulations. Determine the required lightning protection and grounding requirements. Locating The Hand-Held Radio Interface (HHRI) The HHRI unit is designed for an indoor office environment. Choose a location where the ambient air temperature is between -10 and +40 C, and relative humidity in the 20-80% range. CAUTION: Operation outside the temperature and humidity range may cause severe damage to the HHRI unit.

2 Power Connection The HHRI unit is provided with an external power transformer with DIN plug and wall plug cord for use with 120 V a.c. or 220 V a.c. power source (model specific). See Figures 2 for connection diagrams. Antenna Connection For most installations, it is recommended that the antenna is located away from the HHRI unit and raised high enough to provide good coverage. A roof-mounted antenna will provide much better coverage than the small rubber duck type antenna. This is particularly helpful when using an external keyboard (central computer) since many keyboards malfunction in the presence of a strong radio frequency fields. Setup With SitePro Central The HHRI unit can be interfaced with the SitePro Central computer through HHRI Port 1 and a designated COM port or a Rocket Port (depending on how your computer is equipped) using the appropriate SitePro interface cable. Cable assembly P/N is used for a designated COM port connection and cable assembly P/N is used for the Rocket Port connection. See Figure 2 for connection diagrams. If assistance is needed in configuring either the SitePro Central or the HHRI unit during installation, please contact your Toro distributor or field service representative. Setup With Touchnet Central The HHRI unit can be interfaced with TouchNet through HHRI Port 1 using the TouchNet interface cable assembly P/N See Figure 2 for connection diagrams. If assistance is needed in configuring either the TouchNet Central or the HHRI unit during installation, please contact your Toro distributor or field service representative. Software Installation Step 1 - Ensure that all HHRI unit hardware components are properly installed. Note: The following steps 2 and 5 are required for PC-based central systems only. Step 2 - Run the self-prompting installation software (INSTALL.EXE). Follow the step by step software set-up and select the proper options as instructed. Step 3 - After the software set-up has concluded, switch ON the HHRI unit. Step 4 - The HHRI unit should show in its LCD display PC ONLINE AWAKE if operating with a Site-Pro central or TOUCHNET ONLINE AWAKE if operating with a TouchNet central. If the message does not appear, re-initialize Site-Pro or TouchNet. If the problem persist, see Troubleshooting on page 10 for additional solutions. Step 5 - Ensure that the central irrigation control program is operational. Note: The Hand-held radio and the HHRI unit must be programmed to the same frequency to enable the system communications. Step 6 - Set the hand-held radio frequency to the same frequency of the HHRI unit. Verify that voice communication is working properly. Set the speaker volume on the HHRI unit to the desired level. Step 7 - Test the HHRI unit operation by transmitting from the hand-held radio as follows: Note: Audible signals called response tones are transmitted to the hand-held radio which enable you to easily determine how the system is functioning during set-up and remote command operation. Two distinct tones are transmitted in various combinations: A high pitch, short duration tone called a dit, and a lower pitch longer duration tone called a dah. Press and hold the Push-To-Transmit (PTT) switch in the left side of the hand-held radio. Press the then press then release the PTT switch. You should hear one of the following response tones: Dit-dit which indicates the system is ready for remote operation. Dit-dah which indicates the system is inoperable and not ready for remote operation because the HHRI unit is in sleep mode. Dah-dah which indicates the system is not available for remote operation because the HHRI unit is not connected properly to the central and/or the central software is not operating properly. If this response tone occurs, check all previous installation steps, then retry the system test. This response tone will also be automatically sent to the hand-held radio if the HHRI unit becomes inoperable. Step 8 - Continue to the next section System Configuration Figure Central Computer 2. - External Antenna 3. - HHRI Unit 4. - HHRI Power Transformer 5. - HHRI Port Interface Cable, DB9M/DB9M 7. - Central Computer Com Port 8. - Rocket Port Cable Assembly 9. - Rocket Port 25-Pin Female Socket TouchNet Unit Interface Cable, DB9M/DB25M TouchNet 25-Pin Female Socket HHRI Telephone Socket 4

3 System Configuration Security Code To help safeguard against unauthorized hand-held radio operation, the HHRI unit utilizes a three-digit security code which must be entered prior to issuing any irrigation system operating commands. The factory default security code is and can be used if desired; however, selecting your own security code is recommended. If you do not wish to change the security code, you can skip the following procedure and continue to Time-Out Duration section. Step 1 - While pressing the PTT switch on the hand-held radio, press the radio keys in the sequence shown in Figure 3. Step 2 - Release the PTT switch and listen for the response tone. A dit-dit-dit response tone indicates that the entry was accepted. A dit-dah-dit-dah response tone indicates that the entry was not accepted and must be tried again. Figure 3 Select Security Code Operation Begin Command Code Current Security Code New Security Code New Security Code End (Three Digits) (Three Digits) (Three Digits) Default Code = 123 Confirmation Select Security Code Example: Set security code to 444 Note: The above procedure is typical of the way all commands are entered on the hand-held radio keypad. The correct sequence and number of keys pressed is essential for successful operation. A response tone will always be generated after the key sequence to indicate an acceptable or unacceptable command entry. Time-Out Duration The HHRI unit can be taken off-line manually or automatically and placed in a sleep mode when not in use. A time-out duration can be set which enables the HHRI unit to remain awake indefinitely or for a period of time from 15 to 255 minutes before automatically returning to the sleep mode. The time-out period starts as soon as the wake-up command has been responded to. One minute prior to returning to the sleep mode, a warning response tone (dit-dit-dit-dit-dit) will be automatically sent letting you know the remote system is about to go off line. You will also hear this response tone whenever an operation command is issued with one minute or less remaining in the time-out period. Step 1 - While pressing the PTT switch on the hand-held radio, press the radio keys in the sequence shown in Figure 4. Step 2 - Release the PTT switch and listen for the response tone. A dit-dit-dit response tone indicates that the entry was accepted. A dit-dah-dit-dah response tone indicates that the entry was not accepted and must be tried again. Note: To keep the HHRI unit on line indefinitely, enter 000 for the time-out duration. Figure 4 Time-Out Duration Operation Begin Command Code Security Code Time-out Duration End (Three Digits) (Three Digits: Minutes 000 = No Time Out) Set Time-Out Duration Example: Set time-out to 60 Minutes using the default Security Code. 3

4 HHRI System Operation Commands Operating Modes The HHRI unit can be taken off-line and placed in a Sleep mode when not in use. Once in a sleep mode, a Wake-Up command must be issued from the hand-held radio to bring the HHRI unit back to Operation mode. Sending A Sleep Command Step 1 - While pressing the PTT switch on the hand-held radio, press the radio keys in the sequence shown in Figure 5. Step 2 - Release the PTT switch and listen for the response tone. A dit-dit-dit response tone indicates that the entry was accepted. A dit-dah-dit-dah response tone indicates that the entry was not accepted and must be tried again. Figure 5 Sleep Mode Command Operation Begin Command Code Security Code End (Three Digits) Sleep Mode Sending a Wake-Up command Step 1 - While pressing the PTT switch on the hand-held radio, press the radio keys in the sequence shown in Figure 6. Step 2 - Release the PTT switch and listen for the response tone. A dit-dit-dit dit-dit response tone indicates that the entry was accepted. The HHRI unit is now in Operation mode and ready to accept radio commands. A dit-dit-dit dah-dah response tone indicates that the HHRI unit is awake, but is not communicating with the central controller. Check for proper central operation and retry the wake-up command. Figure 6 Wake-Up Command Operation Begin Command Code Security Code End (Three Digits) Sleep Mode System Command Codes The irrigation system command codes are organized into five categories: Manual Start And Syringe (Command Codes 10 19) Multi-Manual (Command Codes 20 29) Pause And Resume (Command Codes 30 39) Cancel And Hold (Command Codes 40 49) Special Functions (Command Codes 50 59) Within these categories you will find the various irrigation system control operations, their assigned command code and the proper key sequence required to send the command. Please note that not all commands are relevant to all central control systems. Notations are provided with each command category to define the system operation variables. Note: The following irrigation system operation commands apply to the Network DR2, Network LTC, TouchNet and Network 8000 control systems only. All Network CDS operation commands are listed in a separate section. 4

5 In order for the commands to be performed by the central controller, the following criteria must be met: The HHRI unit and central computer must be properly connected and all components switched ON. The TouchNet must be programmed and operational or the PC-based Network central program must be running and the HHRI unit software correctly installed and functional. The HHRI system must be in Operation mode and ready for transmitted operation commands. Step 1 - While pressing the PTT switch on the hand-held radio, press the radio keys in the sequence shown in Figure 7. Step 2 - Release the PTT switch and listen for the response tone. A dit-dit-dit response tone indicates that the entry was accepted. A dit-dah-dit-dah response tone indicates that the entry was not accepted and must be tried again. Note: Downloading operating information from the PC or TouchNet central to the satellites will take priority over commands issued from the hand-held radio. Therefore, hand-held radio commands will be ignored during the period of time required to complete the download process. Network DR2 and TouchNet require for the Group Number in the command sequence. For Network DR2, Satellite Number (000=All) does not apply. Figure 7 Manual Start And Syringe Commands Operation Begin Command Code Group Satellite No. Program No. Run Time End (Two Digits) (Three Digits (Two Digits) (Two Digits 000 = All) Min.) Manual Start Manual Start w/ Repeats Manual Syringe By Run Time = Does not apply to Network 8000 = Does not apply to Network DR2, Network LTC or TouchNet Multi-Manual Commands Operation Begin Command Group Satellite No. Run Time. Station No. Run Time End Code (Two Digits) (Three Digits) (Two Digits (Two Digits) (Two Digits Min.) Min.) Multi Manual w/single Run Time Enter one to six* stations Multi Manual w/individual Run Time Enter one to six* Station/Run Times Cancel Multi-Manual = Does not apply to Network 8000 *Touchnet = 1 4 Pause And Resume Commands (These commands do not apply to TouchNet) Operation Begin Command Code Group Satellite No. Program No. Pause Time End (Two Digits) (Three Digits (Two Digits (Two Digits 000 = All) 00 = All) Min.) System Pause System Resume Pause One Or All Programs Resume One Or All Programs = Network LTC and Network DR2 will pause and resume all programs only. Pause time does not apply. Enter any two digit for pause time. 5

6 Figure 8 Cancel And Hold Commands Operation Begin Command Code Group Satellite No. Program No. Station No. End (Two Digits (Three Digits (Two Digits (Two Digits) 00 = All) 000 = All) 00 = All) System Cancel Cancel One Or All Programs Cancel a Station System Rain Hold Rain Hold And Cancel Remove System Rain Hold Program Hold Program Hold And Cancel Remove Program Hold = Group number 00 (all) and Satellite number 00 (all) do not apply to this operation. = Group number 00 (all) does not apply to this operation. = Does not apply to Network = The only Cancel/Hold command available to TouchNet. Note: Some global operating commands (i.e., Cancel All ) issued from the hand-held radio require extended processing time to complete. In some cases this condition may produce a System Inoperable response tone (dah-dah). If this occurs, simply wait an additional 60 seconds for the central computer to finish processing, after which the Command Accepted response tone (dit-dit-dit) will be transmitted indicating that the operation was completed. Figure 9 Control Request Command (Applies to Network 8000 Only) Operation Begin Command Code Group Satellite Number Control Request Code End (Two Digits) (Three Digits) (Two Digits ) Control Request 6

7 System Operation Commands - For Network CDS The following system operation commands apply to the Network CDS control system only. The operation commands for the Network DR2, Network LTC, TouchNet For LTC Plus and Network 8000 control systems are listed in the HHRI System Operation Commands section. In order for the commands to be performed by the central controller, the following criteria must be met: The HHRI unit and central computer must be properly connected with all components switched ON. The central control program must be functioning and the applicable HHRI software correctly installed and functional. The HHRI unit must be awake and ready for system operation commands. The system operation commands are organized into three command code categories; Manual Start, Multi-Manual and Cancel and Hold. Within these categories, you will find the various irrigation system control operations, their assigned command code and the associated key sequence required to send the command to the central. Step 1 - While pressing the PTT switch on the hand-held radio, press the radio keys in the sequence shown in Figure 10. Step 2 - Release the PTT switch and listen for the response tone. A dit-dit-dit response tone indicates that the entry was accepted. A dit-dah-dit-dah response tone indicates that the entry was not accepted and must be tried again. Figure 10 Manual Start Command Operation Begin Command Code CSG No. Station Group No. Program Number End (Two Digits) (Three Digits, 000 = All) (Two Digits) Manual Start Program Multi-Manual Commands Operation Begin Command Code CSG No. Run Time Station No. Run Time End (Two Digits) (Two Digits - (Three Digits) (Two Digits Min.) Min.) Multi-Manual w/single Run Time Enter One To Four Stations Multi-Manual w/individual Run Time Enter One To Four Stations/Run Times Cancel And Hold Commands Operation Begin Command Code CSG No. Program Number Station Number End (Two Digits, 00 = All) (Two Digits, 00 = All) (Three Digits) Cancel All Cancel One Or All Programs Cancel A Station System Rain Hold Rain Hold And Cancel Remove System Rain Hold Program Hold Program Hold And Cancel Remove Program Hold = Group Number 00 (All) does not apply to this operation. 7

8 Advanced HHRI Operation And Commands Placing Telephone Calls Using Two-Way Radio Two-way radios can place autopatch telephone calls through the HHRI unit using the telephone line connected to the rear of the HHRI unit. The HHRI unit operates in a simplex mode. In other words, it can only receive or transmit at any given time but not simultaneously. If the HHRI unit is transmitting, it cannot receive and when it is receiving, it cannot transmit. The HHRI unit uses a Voice Operated Switch (VOX) circuit on the telephone line. The VOX circuit switches the HHRI unit from transmit mode to receive mode when it detects the incoming audio from the telephone line has stopped. Step 1 - Press the telephone call. keys on the two-way radio DTMF keypad. This tells the HHRI unit that you wish to place a Step 2 - Listen for the three quick beeps (dit-dit-dit) to come back from the HHRI unit. If Autopatch operation has been disabled (Autopatch timer=0) from the Configuration Menu, then an error message will be heard. Step 3 - Begin dialing the telephone number you wish to call after the dial tone ends. After entering the telephone number, you have to press the key to place the call. Alternatively, the phone number will be dialed if no keys are pressed after a few seconds. The DTMF tones being sent to the phone line will be heard to confirm dialing. Step 4 - Once the called party answers, the phone VOX circuit takes over. When the called party speaks, the HHRI unit transmits his or her voice. Step 5 - A periodic ticking sound will be heard by the mobile user as the HHRI unit briefly switches from transmit mode to receive mode to determine whether the mobile user wishes to interrupt the conversation and has begun transmitting. Step 6 - If neither party is talking, a single beep will be heard periodically to remind the mobile user that the phone patch is still in operation. Step 7 - A time-out timer exists in order to shut down the phone patch automatically in the event that the mobile user goes out of range or has a battery outage. Warning beeps or a voice message will be sent 30 seconds before the timeout timer expires and the phone call is terminated. The mobile user may press the key in order to reset the time-out timer and continue the phone call. Step 8 - End the conversation from the two-way radio by pressing the message should be heard to confirm the disconnection. key. A high and low beep sequence or a voice Auto Dial Memory The HHRI unit provides an Auto dial Memory feature enabling storage of up to ten telephone numbers which can be automatically dialed. Refer to Programming Auto Dial Numbers for steps to entering telephone numbers. To make an Auto dial call from a two-way radio: Step 1 - Press the keys on the two-way radio DTMF keypad, followed by the Auto dial Memory number you wish to place the call to. Memory number 0 will be used if no number is sent after the command. Step 2 - Once the called party answers, the phone VOX circuit takes over. When the called party speaks, HHRI unit transmits his or her voice. Step 3 - A periodic ticking sound will be heard by the mobile user as the HHRI unit briefly switches from transmit mode to receive mode to determine whether the mobile user wishes to interrupt the conversation and has begun transmitting. Step 4 - If neither party is talking, a single beep will be heard periodically to remind the mobile user that the phone patch is still in operation. Step 5 - A time-out timer exists in order to shut down the phone patch automatically in the event that the mobile user goes out of range or has a battery outage. Warning beeps or a voice message will be sent 30 seconds before the timeout timer expires and the phone call is terminated. The mobile user may press the key in order to reset the time-out timer and continue the phone call. Step 6 - End the conversation from the two-way radio by pressing the message should be heard to confirm the disconnection. key. A high and low beep sequence or a voice 8

9 Receiving Phone Calls At The Two-Way Radio The HHRI unit can also be used to route telephone calls from the telephone line to a two-way radio. To receive a phone call on the two-way radio: Step 1 - Connect a phone line to the back of the HHRI unit. After a phone line is connected, callers can dial the to it. With REMOTE PAGING enabled, the caller will hear Enter the message. By entering, the caller prompts the HHRI unit to transmit a simulated ring signal over the air to the two-way radio user. To answer the call, a two-way radio user must enter the command. Step 2 - Once the called party answers, the phone VOX circuit takes over. When the phone user speaks, the HHRI unit transmits his or her voice. Step 3 - A periodic ticking sound will be heard by the mobile user as the HHRI unit briefly switches from transmit mode to receive mode to determine whether the mobile user wishes to interrupt the conversation and has begun transmitting. Step 4 - If neither party is talking, a single beep will be heard periodically to remind the mobile user that the phone patch is still in operation. Step 5 - A time-out timer exists in order to shut down the phone patch automatically in the event that the mobile user goes out of range or has a battery outage. The length of the timer is set in the Configuration Menu. Warning beeps or a voice message will be sent a few seconds before the time-out timer expires and the phone call is terminated. The mobile user must press the key to reset the time-out timer and continue the phone call. Step 6 - End the conversation from the two-way radio by pressing the message should be heard to confirm the disconnect. key. A high, then low beep sequence or a voice Note: If uncertain about the settings of Remote Paging and Call Forwarding modes, contact your local Toro distributor or field service representative. Programming Auto Dial Numbers The HHRI unit provides an Auto dial Memory feature enabling storage of up to 10 telephone numbers which can be automatically dialed. These must be programmed prior to use by two-way radio users. To program the Auto dial phone numbers: Step 1 - Select the Program mode by pressing the (dash) key on the keypad. The HHRI unit will prompt you to enter the password. Press and the F1 key. Step 2 - Press 5 to enter the Auto dial Memory sub-menu. Step 3 - Either press number key 0 9 or use the arrow keys to step through the Auto dial memory. The first 20 characters of the Auto dial phone number will be displayed. Note: Each phone number can be up to 30 characters in length. Step 4 - To enter or change the contents of the Auto dial Memory, enter the new phone number using the number keys on the keypad. The following keys have special functions: Key Character Displayed Function _ (underscore) Insert a pause in the dialing sequence DEL {none} Delete the previous character F1 {none} Save the phone number F2 # DTMF # key F3 DTMF key F4 F Flash hook Step 5 - Press the F1 key to save the phone number. Step 6 - Repeat steps 3 through 5 as desired, then press the (dash) key to exit to the main programming menu. 9

10 Sending HHRI Commands Using A Telephone Commands can be placed using a touch-tone land line based or wireless telephone. For this function to operate, an active telephone line must be connected to the phone socket provided on the the back of the HHRI unit. All commands found in this manual can be issued using a touch-tone telephone. Note that while telephone operation is in use, hand-held radio commands can not be sent to the HHRI unit. Step 1 - Connect a telephone line to the telephone jack at the back of the HHRI unit (see Figure 2 on page 2). Step 2 - Using another land line or wireless telephone, place a call to the telephone line that is connected to the HHRI unit. Step 3 - Proceed with the commands just as you would issue a command using a hand-held radio. Note: At initial connection, if no commands are issued for 30 seconds, the HHRI unit will disconnect the call and prompt the user with Call ended. After the first command is issued, the HHRI unit will remain connected for two minutes without any issued commands. If no command is issued after two minutes, the HHRI unit will disconnect and prompt the user with Call ended. Step 4 - To properly end the telephone operation from the HHRI unit, send a with Call ended. command. The HHRI unit will respond Note: If the telephone operation is disconnected before the time-out or properly ending the operation, the HHRI unit will not allow connection until two minutes has elapsed. Troubleshooting The following troubleshooting steps are provided to help you isolate and resolve a problem associated with the hardware and/or software components of the Network Hand-Held system. If voice transmission between the base station and the handheld radios is not present or functioning properly, contact an authorized Toro representative for assistance. If the radios are functioning properly but the Network Hand-Held system is not responding to hand-held radio commands, perform the two fundamental troubleshooting steps (1 and 2) below, then continue to the specific problem you are encountering. If the problem cannot be resolved using the following troubleshooting procedures, contact your Toro distributor for further assistance. Step 1 - Check and confirm that all components and cables are properly connected. Refer to the cable connection diagram in Figure 2 on page 2. Step 2 - Check and confirm that the HHRI unit is switched on and the LCD and program light is on. The following problem is the most commonly encountered: Problem: Solution: Specifications The Program light on the HHRI unit flashes on and off continuously (one second on/three seconds off). This condition indicates the HHRI unit is not communicating with the PC or TouchNet central. Confirm the PC central program is running or the TouchNet is programmed and switched on. Check the serial cable for damage and/or bad connections. Hand-Held Remote Interface (HHRI): Input Voltage - 12 V d.c., 5 V d.c. Input Current - 12 V d.c./1.5a max., 5 V d.c./3.0a max. Enclosure Dimensions - 10" W x 8.5" D x 4" H (25.4 cm W x 21.6 cm D x 10.2 cm H) Power Supply Transformer (supplied): Input - 120/220 V a.c., 50/60 Hz, 0.7A max. Output - 12 V 1.5A, 5 V 3.0A CAUTION: If replacing the HHRI power supply transformer, use Toro P/N Using a transformer which does not meet these specifications can cause damage and/or malfunction to occur. Control System Software/Firmware Version Requirements: The HHRI system is compatible with the following Central/Satellite software and/or firmware versions only: Network CDS, Version 1.5 or higher Network DR2, (all) Network LTC, Version 2.5 or higher Network 8000, Version 5.3 or higher TouchNet For LTC Plus, (all) SitePro, (all) 10

11 Notes: 11

12 Electromagnetic Compatibility Complies with Part 68, Part 22 and Part 90 of the FCC Rules. Ringer Eq No.: 6 FCC Reg #: OMSUSA PA - T FCC ID #: MNT - PC - UC Domestic: This equipment generates and uses radio frequency energy and if not installed and used properly, that is, in strict accordance with the manufacturer's instructions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a FCC Class B computing device in accordance with the specifications in Subpart J of Part 15 of FCC Rules, which are designed to provide reasonable protection against such interference in a residential installation. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient the receiving antenna. Relocate the irrigation controller with respect to the receiver. Move the irrigation controller away from the receiver. Plug the irrigation controller into a different outlet so that the irrigation controller and receiver are on different branch circuits. If necessary, the user should consult the dealer or an experienced radio/television technician for additional suggestions. The user may find the following booklet prepared by the Federal Communications Commission helpful: "How to Identify and Resolve Radio-TV Interference Problems." This booklet is available from the U.S. Government Printing Office, Washington, DC Stock No International: This is a CISPR 22 Class B product The Toro Company, Irrigation Division An ISO-9000-Certified Company Form Number Rev. C