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HA20 2-Channel Controller
3.2 Modbus RS-232 / RS-485 Interface Option
(P/N 10-0253)
The 10-0253 Modbus option PCB adds both RS-232 and RS-485
Modbus RTU slave ports. Figure 3-8 shows this optional PCB
which mounts to connectors on the upper right corner of the HA20
motherboard. TB1 provides two pairs of T/Rx terminals and a floating
terminal for shield continuation. This makes it easy to multi-drop
HA20s 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.
WARNING
Follow correct IEEE RS-232 and RS-485 installation guidelines
when using the 10-0253 option.
HA20 Technical Manual
Figure 3-8. Modbus RS-232 / RS-485 Interface Option (P/N 10-0253)
3-6
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