Moxa M-1401 Manual descargar pdf (Pagina 14)

ioLogik MXIO DLL API Reference Programming Flow

2-4

Connecting to a Single Serial I/O

ioLogik 4000 and R2000 I/O can be used in RS-485, RS-232 control networks. For access to I/O

over RS-485 or RS-232, please pay attention to the following:

z Your computer must be equipped with an RS-232 or RS-485 communication port.

z Make sure that the baudrate and communication parameters for the computer and the I/O are

identical.

z Make sure that the I/O is running under Modbus/RTU

ioLogik 4000 remote I/O

ID: 10

ioLogik E2000 Ethernet I/O

ID: 10

Four steps are required to access remote I/O data using the MXIO Linux Library.:

1. Use MXSIO_OpenCommport to open the COM port and connect to the serial I/O.

2. Use MXSIO_Connect to connect to the serial I/O using the Unit ID (e.g., 10).

MXSIO_Connect should return a handle.

3. Use the handle to access the desired I/O point with Modbus command sets or direct I/O

command sets.

4. To finish the operation, use MXSIO_Disconnect and MXSIO_CloseCommport to release

Windows system resources.

Program Flow III.

Connecting Single RS-485 I/O.

MXSIO_OpenCommport

MXSIO_Connect

Direct I/O

Command Sets

Modbus Command Sets

MXSIO_ Disconnect

MXSIO_Closecommport

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Moxa M-1401 Manual Pagina 14