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TLD2 TNET Line Driver

TLD2 Port
Boosts Signal Strength
Powering TNET Terminals
LED Indicators
Power Adapter Jacks
Network Configuration
Modular Ports
TNET Interface Signal List
Datasheet (141k/PDF documents require Adobe Acrobat Reader pdf)


The TlD2 is used to connect terminals to the TNET System. The TNET (TransTerm Network) is an on-line real time interactive data communication system with which up to 250 remote terminals can send and receive messages to and from a central host computer. The TLD2 functions as both a repeater and a hub on the network. Each TLD2 provides six (6) additional ports to attach terminals to the TNET network. The TLD2 has one input port and seven output ports. Typically, the port labeled "IN" connects to the TNET Network Controller or to an "upstream" TLD2's "OUT" port, the ports labeled "1" through "6" connect to individual terminals, and the port labeled "OUT" connects to the next "downstream" TLD2's "IN" port, although all the output ports can connect to Terminals or other TLD2s.

TLD2 Port

Each TLD2 port is isolated and protected from external noise and signal disturbances. If a cable is damaged or a terminal receives a power surge only terminals "down stream" from the disturbance are effected.

Boosts Signal Strength

The TLD2 Line Driver functions as a signal amplifier by boosting all of the received signals. This enables cable runs of up to 2000 feet between each TLD2s and any adjacent device on the network (unless the cable also carries power).

Powering TNET Terminals

The TLD2 can supply power to the attached terminals with some limitations. Powered terminals cannot be more than 100 feet from the TLD2, and different terminal options can effect a terminal's power consumption (i.e. attaching a handheld laser scanner). Alternatively, a terminal with it's own power adapter can be up located up to 2000 feet from its TLD2.

L.E.D. Indicators

LED indicators on the IN, OUT and the six device ports visually indicate incoming data activity at that port. The "IN" indicator will signal that the TIM1B network controller or upstream TLD2 is properly connected and the controller is polling. The "OUT" L.E.D. indicates that devices further down the trunk are connected and responding correctly. The "1" through "6" L.E.D.s indicate that the terminal attached to that port is properly connected and responding.

Power Adapter Jacks

The TLD2 has two power input jacks but is shipped with only one 1 AMP power adapter. Typically, the single adapter will provide power for the TLD2 and up to six (6) attached devices (depending on terminal options). If more power is required, another adapter can be connected to the second power jack. Additional power may be required if a card reader, laser or CCD scanner, or if some other high-powered device is attached to any of the terminals. In some cases, each terminal may need a separate power adapter.

Network Configuration

Up to 250 TNET terminals can be connected downstream on the TIM1B Network Controller using "daisy-chained" TLD2s connected in a "star-node" topology.

Modular Ports

All of the ports on the TLD2 are RJ45 8-pin modular jacks. The pin-to-signal assignments for the modular jacks are listed below. Notice that the device ports and the "OUT" port are identically pinned, but on the "IN" port, the transmit and receive pairs are reversed. This allows the use of straight through pin­to­pin modular cabling on the network.
RJ-45 Pin No. In Port Signal Description OUT DEVICE Port Signal Description Wire Color (silver satin) TMA-1 Cable Adapter RJ-45 pin number (on terminals)

DB-25M pin no.

1 +12 VDC (Output) +12 VDC (Output) Blue 1 20
2 Ground Ground Orange 2 7
3 TD+ Transmit data + RD+ Receive data + Black 3 23
4 TD- Transmit data - RD- Receive data - Red 4 22
5 RD+ Receive data + TD+ Transmit data+ Green 5 25
6 RD- Receive data - TD- Transmit data - Yellow 6 24
7 Ground Ground Brown 7 1
8 +12 VDC (Output) +12 VDC (Output) Grey 8 21

3 strapped to 16

  • Position 1 is on left-hand side of modular cable plug as you hold it pins up with tab facing away from you.


TNET Communications Ports (inputs & outputs)
  • Serial asynchronous compatible EIA RS-422 interface (RJ45 connector)
  • Light weight aluminum extrusions on left and right sides, aluminum top and bottom panels with front and back ABS end caps.
Operating Environment
  • Operating -- 0ºC to 60ºC (32ºF to 140ºF); Humidity: 5 to 95% noncondensing
  • Storage Temperature -- -30ºC to 70ºC (-20ºF to 158ºF); Humidity: 0 to 100%
Storage Environment
  • Operating -- 0ºC to 60ºC (32ºF to 140ºF); Humidity: 5 to 95% noncondensing
  • Storage Temperature -- -30ºC to 70ºC (-20ºF to 158ºF); Humidity: 0 to 100%
Standard Power adapter
  • Input:  95-125V rms single phase 2-wire 47-63 Hz
  • Output: 12 VDC (unregulated )  1000ma
  • Height:  1.75"  (4.4 cm), Width:   6.9"  (17.5 cm), Depth: 4.2"  (10.67cm)
  • Basic Unit - 1.00 lbs.,
  • Power Adapter - 1.150 lbs.
Max Power Consumption- 
  • TLD2:  1.8VA,  TLD2 & powered terminals:  12VA
Optional Switchable Power Adapter
  • Input:  198 - 256V or 95V -125V rms 2 wire 47-63Hz 
  • Output:  12 VAC (unregulated) 500ma -  140-200 ma. min.
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