Q5 - How To Read Each Mdc-211-Zt Command Status Via The Modbus Communication - ICP DAS USA MDC-211-ZT User Manual

Q5 - How to read each MDC‐211-ZT command status via the Modbus
communication?
MDC-211-ZT can view the real-time status of each Modbus command directly in a Web
UI, and also store the status in the Internal Register starting with the address 39600 (0x2580),
that meaning the Modbus Master can use function code 04 to read the command status.
One command can read up to 126 Internal Register data.
For example of Figure 5.2 above, Modbus Master uses the function code 04 to read the
connection status from 39600 as Table 5.1.
Table 5.1 The corresponding Internal Register address of the command status
Command No.
#001
#002
#003
#004
#005
Figure 5.2 Modbus command real-time status example
Addresses State Code
39600
39601
39602
39603
39604
ICP DAS, MDC-211-ZT user manual , v1.0
Copyright © 2018 by ICP DAS. All rights are reserved.
Web Page Display
GOOD
00 00
83 02 ILLEGAL DATA ADDRESS
83 03 ILLEGAL DATA VALUE
FF 00 DISABLED
TIMEOUT
FF FF
Page 40