HA20 2-Channel Controller
HA20 Technical Manual
3-6
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.
Figure 3-8. Modbus RS-232 / RS-485 Interface Option (P/N 10-0253)
Summary of Contents for HA20
Page 6: ...HA20 2 Channel Controller HA20 Technical Manual v ...
Page 7: ...HA20 2 Channel Controller HA20 Technical Manual 1 1 1 General Description ...
Page 12: ...HA20 2 Channel Controller HA20 Technical Manual 2 1 2 Operation ...
Page 22: ...HA20 2 Channel Controller HA20 Technical Manual 3 1 3 Motherboard Interface PCB ...
Page 30: ...HA20 2 Channel Controller HA20 Technical Manual 3 9 ...
Page 31: ...HA20 2 Channel Controller HA20 Technical Manual 3 10 ...
Page 32: ...HA20 2 Channel Controller HA20 Technical Manual 4 1 4 Enclosures ...
Page 35: ...HA40 4 Channel Controller HA40 Technical Manual 5 1 5 Parts List ...
Page 37: ...HA20 2 Channel Controller HA20 Technical Manual 6 1 6 Specifications ...
Page 39: ...HA20 2 Channel Controller HA20 Technical Manual 7 1 7 Warranty ...