46 Chromalox 3101 Operator's Manual
Hardware Setup (continued)
When shipped from the factory, the multidrop
communications interface is set for RS422.
If you are using RS485, two switches in the
controller hardware must be positioned for the
communications interface. Locate the switches
on the bottom of the controller and position
them as shown in Figure 9.1.
Figure 9.1
RS422/RS485
Communications
Switches
Controller Bot-
tom Surface
Digital Communications Wiring
Wiring connections for the digital communica-
tions interface are made on terminals 9-13 using
shielded serial interface cable.
.............. #1 #2
RS-422 ..... Down Up
RS-485 ..... Up Down
Switch
Note: The DTR output is always enabled when the 3101 power is on.
Figure 9.2
RS232 Wiring
Connections
Computer
RS232 Communications
XMT
RCV
GND
3101
21
19
22
23
20
XMT
RCV
DTR
GND
DSR
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