Datasheet Te l e p h o n e L i n e RTU Modules The Telephone RTU system consists of a pair of devices, a transmitter and a receiver that allow the transmission of 4 analog and 4 digital signals over a twisted pair or dedicated telephone line. The signals are encoded and transmitted as a unidirectional FSK signal. The 4 analog input signals at the transmitter are multiplexed to a single analog output at the receiver. There are 2 selection inputs on the receiver to determine which signal appears at the output. The four digital inputs at the transmitter are presented as four digital outputs on the receiver. There is a fifth digital output which is activated when the communications link is broken. Both the receiver and the transmitter are housed in a metal enclosure with a TS35 rail mounting foot. Optional brackets may be installed for panel mounting. Contact the factory for details. The Telephone RTU works on any twisted pair (with distance limitations) or any telephone line that is unpowered and has no dial tone. In Ontario the units were tested on a 9600bps analog line, "Sched 4 Type 4" provided by Bell. This type of line allows almost any transmission distance to be covered since the maximum input to output loss is guaranteed. The transmission speed is 600bits per second of FSK encoded data. Each transmission "package" consists of 16 bytes (of 12 bits length). The protocol itself has been written specifically for this application. The units have been designed to meet North American telephone interface standards and are isolated from the telephone line by 600 ohm transformers. Connection is achieved through the 6 way RJ11 (telephone) connectors. Irrespective of whether communications is to occur over the telephone line as described above, or a twisted pair only the two middle pins (pins 3 and 4) are used. Pin 2 of the transmitter is connected to pin 2 of the receiver. Pin 3 of the transmitter is connected to pin 3 of the receiver. See figure 1. United States Canada Mexico Weidmuller Inc. Weidmuller Ltd. Weidmuller, S.A. de C.V. 821 Southlake Blvd. 10 Spy Court 5 Sur No. 4311 Richmond, Virginia 23236 Markham, Ontario L3R 5H6 Col. Huexotitla Telephone: (800) 849-9343 Telephone: (800) 268-4080 72534 Puebla, Pue. Mexico Facsimile: (804) 379-2593 Facsimile: (905) 475-2798 Telephone: (22) 37 2549 Email: [email protected] Email: [email protected] Facsimile: (22) 43 1981 Website: www.weidmuller.com Website: www.weidmuller.ca Email: [email protected] 8/3 Telephone Line RTU Figure 1 - Interconnection Specifications: Typical transmission medium twisted pair or analog telephone data line, no dial tone, unpowered (in Ontario this is 9600 bps, "Sched 4 Type 4") Transmission Speed 600 bps, 16 bytes, 12 bits per byte Transmission Protocol: Proprietary Transmission Interface 600Ω transformer coupled Communications Failure Delay of 3 seconds. Analog: Accuracy at 25°C: 0.08% ± 1 bit typical (based on 0.1% input resistors) Step Function Response 600-1700ms (typical) Minimum pulse width (high or low) 300ms (typical) Maximum Frequency (sine wave) 0.1Hz (typical) Digital: Step Function Response 600-1550ms (typical) Minimum digital input pulse width (high or low) 450ms (typical) Maximum Frequency 0.1Hz (typical) 2 8/4 Telephone Line RTU Specifications: Transmitter Module Power Supply Voltage 15-30Vdc Supply Current (typical) 120mA @ 15V, 80mA @24V, 75mA @ 30V Analog Input 4 inputs, resistor selectable 0-20mA (factory setting) or 0-10Vdc other ranges possible, contact Weidmuller Analog Input Impedance (nominal-using recommended values): 0-10Vdc input 20KΩ (use 2 x 10kΩ.1% per channel) 0-20mA input 250Ω (use 1 x 250Ω 0.1% per channel) Accuracy ±0.1% across temperature range Digital Input Current 6mA @ 30Vdc supply 5mA @ 24Vdc supply 3mA @ 15Vdc supply As a result of the low current gold plated contacts should be used, or electronic drivers. Iin=(V-1.6)/4700 where V is the voltage supplied to the anode of the input opto (marked Com.An.). LED Flash rate 250ms on, 250ms off Operational Temp -20° to 70°C Catalog Number Transmitter Module 991652 0000 Use the following table to determine which resistors to change for a given input configuration. Recommended values are Rx=Ry=4.99kΩ, 0.1% for 0-10Vdc input or Ry=10Ω, Ry=250Ω ohms, 0.1% for 20mA input. Default is 0-20mA. Calibration: see Application Notes Figure 2 - Dimensions Contact Weidmuller for the “Telephone RTU” Application Guide or download it from our website www.weidmuller.ca 3 8/5 Telephone Line RTU Specifications: Receiver Module Power Supply Voltage 15-30Vdc Supply Current (typical) 135mA @ 15V, 120mA @24V, 125mA @ 30V Analog Output: Jumper configurable 0-20mA (factory setting) or 0-10Vdc (other ranges possible, contact Weidmuller). Single output Accuracy ±0.1% across temperature range Analog Drive Output: Voltage output 10mA @ 10V 1000Ω min. Current output 20mA output <=500Ω over full supply voltage range RLmax (20mA out) Digital Input ((50*Vs)-200 where RL is the load in ohms and Vs is the supply voltage. Analog Channel Selection: SelA, B Digital Input 2, Optically Isolated Digital Input Current 6mA @ 30Vdc supply 5mA @ 24Vdc supply 3mA @ 15Vdc supply. As a result of the low current gold plated contacts should be used, or electronic drivers. lin=(V-1.6)/4700 where V is the voltage supplied to the anode of the input LED (marked Com.An.). Digital Output Built-in Back EMF diodes for direct relay drive. Standoff Voltage 50Vdc Maximum Output Current 100mA Maximum On voltage @ 100mA 1Vdc (typical) Digital Output 5, Open collector (4 associated with the inputs, 1 for communications failure). Built-in back EMF diodes for all outputs- commoned at Com.Kt When an input is active, (current flowing through the LED input) the associated output will be active (sinking current). When there has been a communications failure, the COMMUNICATION FAILURE output will go active (sinking current). LED Flash rate(nominal): Communications Active 300ms on, 300ms off Communications Inactive 1.5s on 1.5s off Operational Temp Transmitter -10° - 70°C Catalog Numbers Receiver Module 991653 0000 There is a single analog output. It may be configured for voltage or current output by setting a jumper. Ranges may be adjusted away from 0-20mA (factory setting) and 0-10V, see Application Note "Telephone RTU" for details. For convenience, Channel 1 is presented when the channel selection is disconnected. Calibration: see Application Notes 4 Specifications subject to change without notice. 99990203- 06/2001 Printed in Canada 8/6