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HA40 4-Channel Controller
3.2 MODBUS RS-232 / RS-485 Interface Option
(P/N 10-0253)
The 10-0253 Modbus option PCB add both RS-232 and RS-485
Modbus RTU slave ports. Figure 3-7 shows this optional PCB,
which mounts to connectors on the upper right corner of the HA40
motherboard. TB1 provides two pairs of T/Rx terminals and a floating
terminal for shield continuation. This makes it easy to multi-drop
HA40s 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 3.3.1
function codes.
CAUTION
Follow correct IEEE RS-232 and RS-485 installation guidelines when
using the 10-0253 option.
Figure 3-7. HA40 Modbus Interface Option (P/N 10-0253)
HA40 Technical Manual
lists all modbus registers and their
3.2.1 MODBUS Register And Function Code
Summary
The following table identifies the available modbus RTU register
locations and function codes.
VARIABLE
Read/Write Coils:
Alarm Ack/Reset
NOTE:
After writing a TRUE to this register, the HA40 automatically returns it to
FALSE.
Read Only Discrete:
Chan 1 Fault Alarm
Chan 1 Alarm 1
Chan 1 Alarm 2
Chan 1 Alarm 3
Chan 2 Fault Alarm
Chan 2 Alarm 1
Chan 2 Alarm 2
Chan 2 Alarm 3
Chan 3 Fault Alarm
Chan 3 Alarm 1
Chan 3 Alarm 2
Chan 3 Alarm 3
Chan 4 Fault Alarm
Chan 4 Alarm 1
Chan 4 Alarm 2
Chan 4 Alarm 3
3-6
READ
WRITE
ALIAS
FUNCTION
FUNCTION
CODE
CODE
2001
1
5
12001
2
NA
12002
2
NA
12003
2
NA
12004
2
NA
12005
2
NA
12006
2
NA
12007
2
NA
12008
2
NA
12009
2
NA
12010
2
NA
12011
2
NA
12012
2
NA
12013
2
NA
12014
2
NA
12015
2
NA
12016
2
NA
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