Moxa M-1401 Handbuch PDF herunterladen (Seite 35)

Chapter 5. Modbus Command Sets

Four basic Modbus commands are provided in the Modbus command set. However, you must refer

to the Modbus reference table in ioAdmin to extract data from the Modbus packet.

MXIO_ReadCoils

This function reads the on/off status for a contiguous group of

coils on the same I/O.

C/C++

Arguments

Return Value

int MXIO_ReadCoils ( int hConnection,

BYTE bytCoilType,

WORD wStartCoil,

WORD wCount,

BYTE bytCoils[ ]);

hConnection: Handle for the I/O connection.

bytCoilType: Coil type to be read.

1: read coils (output bit).

2: read discrete (input bit).

wStartCoil: Specifies the starting coil address to be read.

The address is beginning at 0.

wCount: The number of coils to be read.

bytCoils: An array that stores the status of coils; each

byte holds eight coil values. Bit 0 of 1st byte

represents 1st coil status.

Succeed MXIO_OK.

Fail Refer to Return Codes.

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Moxa M-1401 Handbuch Seite 35