
Chromalox 2104 Technical Manual 73
Figure 9.3
RS422A Wiring Connections (4-wire)
2104 2104
GND
23
RCV-
20
RCV+
19
RCV+
RCV-
GND
XMT-
22
XMT+
21
XMT+
XMT-
GND
23
RCV-
20
RCV+
19
XMT-
22
XMT+
21
Note: 270 Ω resistors recommended across receive line on computer and last controller.
270 Ω
270 Ω
Computer with RS422
Interface Card
Figure 9.4
RS485 Wiring Connections (2-wire)
2104 2104
GND
23
R/T-
22
R/T+
21
GND
23
R/T-
22
R/T+
21
R/T+
R/T-
GND
Note: 270 Ω resistors recommended across receive line on computer and last controller.
270 Ω
270 Ω
Computer with RS485
Interface Card
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