Modbus Function Set - Lochinvar Knight 81 Instructions Manual

3
ModBus Confi guration

ModBus Function Set

Function
Dec HEX
1 01
2 02
3 03
4 04
5 05
6 06
7 07
8 08
11 0B
12 0C
15 0F
16 10
17 11
23 17
(continued)
Sub Function
HEX
Dec
0
1
2
4
10
11
12
13
14
15
16
17
18
20
ModBus and BACnet Communication Instructions
Read Coil Status
Read Input Status
Read Holding Registers
Read Input Registers
Force Single Coil
Preset Single Register
Read Exception Status
00 Diagnostic - Return Query Data
01 Diagnostic - Restart Communication
02 Diagnostic - Return Diagnostic Register
04 Diagnostic - Force Listen Mode
Diagnostic - Clear Counters and Diagnostic
0A
Registers
0B Diagnostic - Return Bus Message Count
0C Diagnostic - Bus Communication Error Count
0D Diagnostic - Bus Exception Error Count
0E Diagnostic - Return Slave Message Count
0F Diagnostic - Return Communication Error Count
10 Diagnostic - Return Slave NAK Count
11 Diagnostic - Return Slave Busy Count
12 Diagnostic - Return Bus Character Overrun Count
14 Diagnostic - Clear Overrun Counter and Flag
Get Communication Event Counter
Get Communication Event Log
Write Multiple Coils
Write Multiple Registers
Report Slave ID
Read / Write Multiple Registers
Description
9