Q5: How To Read The Status Of Each Connection - ICP DAS USA MDC-714i User Manual

Q5: How to read the status of each connection?

A5: The status for each connection is saved in the sequence of polling definition from local register
address 39600. The maximum number of polling definition in the config.csv file is 250, so the
available address for the connection status is from 39600 to 39849. A Modbus master use
function code 04 to read the status, up to 126 register of status can be read in one command.
For example, the status of the graph shown above is presented as the third column in the
following table.
Def. Address
number
Def.#001 39600
Def.#002 39601
Def.#003 39602
Def.#004 39603
Def.#005 39604
Def.#006 39605
The value of status:
0: Good
0xFFFF: Timeout
0x8XYY: Exception Rresponse.
Exception Name
Code
01 Illegal Function
02 Illegal Data Address
03 Illegal Data Value
04 Illegal response
length
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Status Status display on web page
0 GOOD
0 GOOD
0xFFFF TIMEOUT
0x8201 ERROR: ILLEGAL FUNCTION
0 GOOD
0x8402 ERROR: ILLEGAL DATA ADDRESS
X - Modbus Function Code.
Meaning
The function code received is not an allowable action.
The data address received in the query is not an
allowable address.
A value contained in the query data field is not an
allowable value.
The request would generate a response with size bigger
than that available for MODBUS protocol.
YY - Exception Code.
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