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ICP DAS
2.2. modbusRequestXV
Description:
This function is used to send a Modbus protocol request in an LP-22xx/52xx system.
Syntax:
int
modbusRequestXV(char cPort, char cFunction, WORD wAddr, WORD wCount,
Parameters:
cPort:
[Input] The number of the COM port for the XV-Board. 1=COM1=/dev/ttyO1.
cFunction:
[Input] The Modbus RTU protocol function code.
wAddr:
[Input] The channel address.
Note: Input the channel address mapping in
wCount:
[Input] The number of channels.
szBuf[ ]:
[Input/Output] Used to set or read back the value from a function code.
wBufLen:
[Input] The length of the szBuf[ ].
Return Values:
0: The function was successfully processed.
Other: The processing failed.
Refer to Chapter 3:
char szBuf, WORD wBufLen)
"Error
Codes" for details of other returned values.
LinPAC-52xx Series XV-Board API User Manual
[ C ]
decimal
format.
8
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