UNIVERSAL RS-232/422/485 CONVERTER FA-UNICON

Transcription

1 UNIVERSAL RS-// CONVERTER FA-UNICON Universal RS-// Converter The FA-UNICON converter may be used to convert RS- signal levels to RS-/ signal levels or RS-/ signal levels to RS- signal levels. The FA-UNICON kit contains the following components: (A) RS-// Converter (RS- = DB Female, RS- = DB Male) (B) DB Male to Male Gender Changer (C) DB Male to RJ PC Connector (D) ' Cable with RJ PC Plug and RJ PC Plug (E) ' Cable with RJ PC Plug and RJ PC Plug DL0 Connection The RS-// Converter, may be used to convert the RS- ports of a DL0 CPU into RS- signal levels. Use components A, C, and D for this connection. The RJ PC modular plug on component D plugs directly into the Port or Port female connector socket on the DL0 CPU. The PC modular plug on component D plugs into the PC modular connector on component C. The RS- connection to an external device or Automationdirect.com Network is made at the male DB- plug connector on component A. This RS- connection may be connected to a multidrop RS- network since the line controls the RS- transmitters. This converter configuration must be powered by an external V dc supply. Automationdirect.com is a Trademark of Automationdirect.com Incorporated. Copyright 99, FA Engineering LLC, 09 Photonics Dr., New Port Richey, FL.. Date of Publication: March 00 Order Number: FA-UNICON-M

2 DL0 Connection The RS-// Converter, may be used to convert either RS- port of a DL0 CPU into RS- signal levels. Use components A, C, and E for this connection. The RJ PC modular plug on component E plugs directly into the Port or Port female connector socket on the DL0 CPU. The PC modular plug on component E plugs into the PC modular connector on component C. The RS- connection to an external device or Automationdirect.com Network is made at the male DB- plug connector on component A. When Port is used, the RS- connection is point to point only since there is no line to control the RS- transmitters. When Port is used, the RS- connection may be a multidrop RS- or RS- network since the line on Port controls the RS-/ differential transmitter. This converter configuration requires no external V dc supply. The converter is powered by the V dc provided by the DL0 CPU. NOTE: The red and black leads on the converter must remain unconnected when V dc power is used. D--DCU RS- Data Communications Unit Connection The RS-// Converter may be used to convert the RS- port of a DL0 Data Communications Unit, D--DCU, into RS- signal levels. Use component A for this connection. The male DB- connector of the Converter plugs directly onto the female DB- connector socket on the D--DCU. The RS- connection to an external device is made at the female DB- connector on the other side of the Converter. This converter configuration must be powered by an external V dc supply. D--DCU RS- Data Communications Unit Connection The RS-// Converter may be used to convert the RS- port of a DL0 Data Communications Unit, D--DCU, into RS- signal levels. Use components A and B for this connection. Plug DB male to male gender changer onto the Converter's female DB- connector. Then plug the gender changer directly onto the female DB- connector socket on the D--DCU. The RS- connection to an external device or DirectNET Network is made at the male DB- plug connector on component A. This RS- connection is point to point only since there is no line to control the RS- transmitters. This converter configuration must be powered by an external V dc supply.

3 External Power Requirements When the converter is used with a DL0 CPU, no external power is required. The Converter is typically externally powered from the V dc supply on a DL0 High Capacity Rack, however, any V dc power source capable of supplying 00 ma may be used. Connect the red and black wires to the external V dc supply. The converter may also be powered from a regulated V dc supply. Please refer to the wiring diagram on page 9. General Purpose Bi-Directional RS- to RS- and RS- Conversion The RS-// converter may be used to bi-directionally translate RS- signals to high current differential RS- or RS- signals. See pages - for RS- and RS- multidrop wiring examples. Serial Communication Specifications RS-C RS-/ Driver Load Maximum Cable Length Maximum Data Rate (bits per second) Driver Voltage Driver Active State K - K 0 ft 9.K ± - ±0V > +V 0 Ω max. 000 ft 0 M ±.V min. + < - General Specifications Supply Voltage No Load Supply Current Maximum Load Supply Current Maximum Operating Temperature - V dc or V dc ±0% ma (when connected to D--DCU) 00 ma (0 Ω Termination Maximum) 0 C V dc or 0 0 C V dc supply

4 RS- Devices to Converter Wiring Diagrams Personal Computer Converter V D--DCU Data Communication Unit Pin DTE Pin DCE Personal Computer Converter 0 + V D--DCU Data Communication Unit 9 Pin DTE Pin DCE Note: This document follows the EIA standard for RS- pin names. and are pin names and do not indicate signal direction. Please see page for additional information. Convert SIMATIC TI RS- to RS- RS- FA-UNICON RS- / TI RS- 0 + V Xmit Enable DO+ DO- DI- DI+

5 Four Wire (RS-) Multi-Drop Wiring Recommended for Automationdirect.com PLC applications XMIT EN +V XMIT EN +V XMIT EN +V XMIT EN +V TX RX Slave Stations---- Master Station FA-UNICON RS- RS- Personal Computer DCE Device Earth Gnd 0 Ohm Typ.

6 Two Wire (RS-) Multi-Drop Wiring Not recommended for Automationdirect.com PLC applications. All transmitted data is echoed with this configuration. The RS device must be able to process the echoed data. Personal Computer Master Station RS- FA-UNICON RS- TX RX 9 0 +V Xmit EN Ohms ----SLAVE STATIONS V Xmit EN V Xmit EN Otuput V Xmit EN Ohms Earth Ground

7 Cable Shielding Shielding improves noise immunity (magnetic field protection). It is important to ground the shield at the receiver end only. Grounding the receiver end only provides the least high frequency signal attenuation and the best rejection of unwanted signals. Grounding both ends of the shield will cause magnetic field induced noised currents to flow through ground. Noise may then appear on the data lines due to transformer like coupling with the shield. If the cable shield must be used as the system ground conductor then placing a 00 Ω resistor in series with the shield and the ground connection will reduce noise producing ground currents. Connecting Cables and Line Termination A dual, RS-, or single, RS-, twisted pair plus ground connection between devices is recommended. Proper termination of the balanced transmission line is required to prevent data errors. A typical AWG solid wire with.00 inch plastic cover, twisted. times per foot has a characteristic impedance of about 0 Ω. Thus the selection of the two Ω line-to-ground terminating resistors (see below). Line-to-ground termination is preferred to the often shown line-to-line 0 Ω termination. In noisy or long line applications the much better line-to-ground (signal ground) common-mode rejection capability is particularly important. RS- and RS- line terminations should be at the extreme ends of the cable runs only. Addition of intermediate terminations will adversely load the line. RS- Line Termination (At ± extreme end of each Line) + + Line to Line Ω 0Ω Ω RS- Line Termination (extreme ends only) /+ Line to Line /+ 0Ω Intermediate Drops 0Ω /+ 0Ω Line to Ground 0Ω /+ 0Ω Intermediate Drops 0Ω - - /- /- /- /-

8 MORE ABOUT RS- RS--C (RS-) is an interface standard from the Electronic Industries Association (EIA). The standard names and defines 0 communication signals, assigned to separate pins in a -pin connector. The five unassigned pins may carry nonstandard signals required by any individual system. Each signal is transmitted as a positive or negative electric current between and volts (usually volts). The signal assigned to each pin flows in one direction only. Signals output, for example, from a computer must input to a terminal, and vice versa. RS- signals travel over a serial interface cable that may have up to wires, each of which can be attached to a pin in the connector at either end of the cable. Since most signals are not required for simple communication, cables have as few as or wires, with only the necessary wires attached to the connectors. Often it is necessary to install jumpers at one or both of the connectors to ensure that control signals are satisfied. The signals flow between two types of interface ports, data communication equipment (DCE) and data terminal equipment (DTE). The pin names are the same for both DCE and DTE equipment, however, the direction of signal flow is reversed. The table below shows names, pin assignments, and directions of signal flow for the commonly used RS- signals. RS- DTE and DCE Pin Names and Signal FlowPin Pin Abbrev. Name Signal Direction DCE DTE FG Frame Gound None None Transmit Data Receive Data Request to Send Clear to Send Data Set Ready Signal Ground Data Carrier Detect 0 Data Terminal Ready Ring Indicator Description DTE Data Path DCE Data Path DTE has data to XMIT DTE may XMIT data DCE has data to XMIT Modem has carrier DCE may XMIT data Identifying the Communication Port as DCE or DTE With an unknown RS- port powered, measure the dc voltage between pin- and ground (pin-) and pin- and ground. If the most negative pin is pin- then the port is DTE. If the most negative pin is pin- then the port is DCE. Improper connection of pins and will not damage the interface.

9 RS- TO RS-/ CONVERTER WING DIAGRAM Date: FA-UNICON RS- RS- / 0 +V Xmit Enable DCE Device 0V +V Red +VDC Black 0V +VDC Supply Alternate to +V -VDC Supply Project Location * +V dc, pin, may be connected to RS-, pin 0, to turn ON the RS-/ differential transmitter. Or an RS- hardware handshaking line ( or typically) may be connected to to control the ON/OFF state of the RS-/ transmitters. If the Converter is powered by a regulated V dc supply connected to pins and then no connection should be made to the tinned and stripped red and black V dc supply wires exiting the case. 9