Honeywell HA40 technical manual Modbus RS-232 / RS-485 Interface Option

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 lists all modbus registers and their 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)

3.2.1MODBUS Register And Function Code Summary

The following table identifies the available modbus RTU register locations and function codes.

		READ	WRITE
VARIABLE	ALIAS	FUNCTION	FUNCTION
		CODE	CODE
Read/Write Coils:
Alarm Ack/Reset	2001	1	5
Note:

After writing a TRUE to this register, the HA40 automatically returns it to

FALSE.

Read Only Discrete:

Chan 1 Fault Alarm	12001	2	NA
Chan 1 Alarm 1	12002	2	NA
Chan 1 Alarm 2	12003	2	NA
Chan 1 Alarm 3	12004	2	NA
Chan 2 Fault Alarm	12005	2	NA
Chan 2 Alarm 1	12006	2	NA
Chan 2 Alarm 2	12007	2	NA
Chan 2 Alarm 3	12008	2	NA
Chan 3 Fault Alarm	12009	2	NA
Chan 3 Alarm 1	12010	2	NA
Chan 3 Alarm 2	12011	2	NA
Chan 3 Alarm 3	12012	2	NA
Chan 4 Fault Alarm	12013	2	NA
Chan 4 Alarm 1	12014	2	NA
Chan 4 Alarm 2	12015	2	NA
Chan 4 Alarm 3	12016	2	NA

HA40 Technical Manual 3-6 Revision 1 (08/08)