GE AquaTrans AT868 - Page 21

Installation 1-13
September 2004
Using an INMAC Converter To wire the RS485 serial port using an INMAC converter, refer to
Figure 1-5 on page 1-16 and complete the following steps:
1. Route one end of the cable through the conduit hole and wire the
leads to the COMMUNICATION terminal block as shown in
Figure 1-5 on page 1-16. Then, secure the cable clamp.
2. Connect the other end of the cable to the converter, as shown in
Figure 1-3 below.
3. Do one of the following:
• Proceed to another section to continue wiring the AT868.
• Reinstall the plastic shroud, replace the front cover on the
enclosure and tighten the screws.
Figure 1-3: Typical RS485 Connections
Using a Factory Serial
Interface
Use the following steps to link the AT868 to the control system using
a factory-installed RS485 serial interface:
1. Route the wires through the conduit hole and connect the TMT+
lead to Pin 2 (RX) on the COMMUNICATION terminal block
(see Figure 1-5 on page 1-16).
2. Connect the TMT- lead to Pin 1 (TX) on the COMMUNICATION
terminal block. Then, secure the cable clamp.
3. Connect the other end of the cable to the control system.
4. Do one of the following:
• Proceed to another section to continue wiring the AT868.
• Reinstall the plastic shroud, replace the front cover on the
enclosure and tighten the screws.
4 RD IN
Model AT868
Converter
TX 1
RX 2 3
N.C. 3 2
N.C. 4 1 TD OUT
N.C. 5