Manual. Specifications. Contents. Options

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1 Page 1 ATE-502: USB Relay Controller - 4 Relays The ATE-500/600 series is a range of modular I/O controllers. It uses small standardized boards which allows you to configure the system to your requirements. The ATE-502 is a relay controller with 4 relays. It can be controlled with ASCII commands via USB. Specifications 4 Relays 5A/250Vac with 2x 1 common and 2x 4 NO contacts Connections via screw terminals Arduino software compatible Control with ASCII commands USB virtual COM with FTDI adapter or cable Powered via USB or 5Vdc power supply Dimensions 10 x 8 x 2 cm (approx.) Open source hardware and software Made in Holland Contents The ATE-502 includes: ATE-101 Carrier Board with Arduino Pro Mini and ATE-502 Sketch firmware ATE-201 Relay Board with 4 relays Options The ATE-502 has the following options: USB Basic FTDI Adapter 5V (SFE09716) USB FTDI Cable 5V (SFE09718) 5Vdc Power Supply (ACDC5012) Enclosure Hammond 1598B

2 Page 2 Assembly The ATE-502 USB Relay Controller consists of ATE-101 and ATE-201, which should be assembled as shown on the picture. Connections For USB connection the FTDI Basic USB Board can be used or the FTDI USB Cable. The USB Board can be placed on the ATE-101 Arduino Board. The FTDI adapter board should be placed correctly, as on the picture. The FTDI adapter and ATE-101 board have the indications GRN and BLK.

3 Page 3 When an FTDI Cable is used make sure the green wire is connected to the pin indicated GRN and the black wire to the pin indicated BLK.

4 Page 4 The ATE-201 Relay Board has 2 common connections and 4 NO (Normally Open) connections. The common connections are connected to each other and to the 4 relay contacts. OUT 1 OUT 2 OUT 3 OUT 4 COMMON COMMON 5V POWER INPUT The Relay Board is powered via the USB input on the ATE-101 Arduino Board. If you want to power the Relay Board with a 5Vdc power supply, then you can use the 5V POWER INPUT. In this case jumpers on both boards must be changed. Power Supply The ATE-502 can be powered via USB or 5Vdc power supply. An 5Vdc power supply is not required because the maximum current is 300mA. The maximum current via USB is 500mA. If you have more devices on USB which require current, you can use an external stabilized 5Vdc power supply (like ACDC5012). In this case jumpers on both boards must be changed. The Relay Board and the Arduino Pro Mini have a power on led.

5 Page 5 Jumper settings At delivery the jumpers on every board are by default set for power via USB use. The jumpers settings should be as on the photos above: ATE-101: 4-3 5V ATE-201: 3-4 INT If you want to use an external 5Vdc power supply, the jumper settings should be as follows: ATE-101: no jumper ATE-201: 1-2 EXT ATE-502 Tester The ATE-502 Tester is a Windows program which can be used to test the controller. This software and source code can be downloaded from When an FTDI USB Board or cable is connected for the first time, Windows will install the driver and will give it a port number. After opening the Tester, type in this port number and click on Open. If you do not know the port number, you can click on List Ports and you will see the available port(s). The Tester will read the status of the relays continuously and show the results. When you click on Toggle, you can switch the relay on and off. Green indicates contact is closed and red indicates contact is open. Communicating with the Controller The Address and Baud Rate of the unit can be set and are stored in the controller s memory. By default the controller is listening for serial data at 9600 baud, and has address 00. The controller will always use 1 Stop Bit, 8 Data Bits and No Parity. The commands the controller uses are in the CC X<CR> symbol is used to define the start of a command.

6 Page 6 AA is the address of the unit from 00 to 99. CC is a two letter command used to determine the command type. X is a one or more characters which determines the parameter for the command. <CR> is the carriage return character. This is ASCII character 13, or 0x0d. Each time a valid command is received the unit will respond with #AA followed by any values that are requested from the unit. ON: Relay On Command This command is used to turn a single relay on. ON 1 will turn relay 1 on for the unit with address 44. It can also be used to turn all the relays on, this occurs when the parameter value is 0. OF: Relay Off Command Similar to the on command this command will turn relays off in the same manner. OF 1 will turn relay 1 off for the unit with address OF 0 will turn all relays off. WR: Write Relays Command The write relays command is used when more than one relay is to be turned on or off at once. The parameter is a decimal number which, in binary, represents the on and off status of relays 1-4. The least significant bit of this value controls relay 1. A set bit (1) turns the relay on, a cleared bit (0) turns the relay off. Example: To turn relays 1 and 2 on (and others off) the binary value required is In decimal this is 3. To issue this to a controller with address 44, the required command WR 3 RS: Relay Status Command This command will return the status of relays 1-4. If the parameter is between 1 and 4 then the unit will return with a 0 or 1 corresponding to that relay. RS 1 will return #44 1 if the relay is on, or #44 0 if the relay is off. If the parameter is 0 then the unit will respond with the status of all 4 relays, in similar form as the Write Relays command. E.g.: If relays 1 and 2 are on RS 0 will return # is in binary, and each bit represents each relay status from 8 down to 1. SA: Set Address Addresses are valid from A unit will only respond if its address in memory is the same as that of the command sent, or if the address of the command sent is 00.

7 Page 7 The address is saved to non-volatile memory inside the controller, meaning it will be preserved even after power is disconnect from the controller. SB: Set Baud Parameters from 1 to 10 are valid, corresponding to the following values. 1: 1200 baud 6: baud 2: 2400 baud 7: baud 3: 4800 baud 8: baud 4: 9600 baud (default) 9: baud 5: baud 10: baud The baud rate is saved to non-volatile memory inside the controller, meaning it will be preserved even after power is disconnect from the controller. Serial Terminal Program You can use a serial terminal program to communicate with the controller. One of the popular Windows terminal programs is Tera Term. It can be downloaded from When you have connected the controller to the PC and you start Tera Term, you will get the following screen. If you select Serial you can select the port you are using.

8 Page 8 After OK you get an empty screen. Default speed is 9600baud. When you push the reset button on the Arduino microcontroller, then after a few seconds the version of the firmware will appear. To be able to see the commands you are typing, you need to change the terminal setup. Click on Setup and Terminal

9 Page 9 Set New-Line Transmit to CR+LF and switch Local echo on. Click on OK. If you now type a command, you will see it on the screen. To switch relay 1 on, you can After Enter the controller will switch the relay on and respond with #00. To read the status of the relays, you can

10 Page 10 Loading new firmware The ATE-502 uses the Arduino Pro Mini (5V) which is an Atmel ATmega328 microcontroller with Arduino bootloader. The Arduino is loaded with ATE-502 Sketch. The source code can be downloaded from You are free to modify the code. You can load the modified code or any other code via USB into the Arduino Pro Mini with the Arduino development environment, available at Before loading it is recommended to place the 10-9 Auto Reset jumper on the ATE-101 Carrier Board.