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Document: UM-1021
3.2
MODBUS RS-232 / RS-485 INTERFACE OPTION 10-0253
The 10-0253 Modbus option PCB add both RS-232 and RS-485 Modbus RTU slave
ports. Figure 3.9 shows this optional PCB which mounts to connectors on the upper right
corner of the ViewSmart 200 motherboard. TB1 provides two pairs of T/Rx terminals
and a floating terminal for shield continuation. This makes it easy to multi-drop
ViewSmart 200's onto an RS-485 cable without doubling wires into the same screw
terminals. RS-232 interface may be made by connecting to DB9 connector S1. Section
3.2.1 lists all modbus registers and their function codes.
Follow correct IEEE RS-232 and RS-485 installation guidelines when using the 10-
0253 option.
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ViewSmart 200/2050/2150 Controller User's Manual
Figure 3.8
29
Revision Level B
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