Moxa V2426A-C2-W7E [57/88] Epm 3438 programming guide

V2400A Series Expansion Modules Software Installation and Programming Guide

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7. The system should find the new hardware and install the driver automatically. Check the Windows Device

Manager to verify.

EPM-3438: Programming Guide

Some operations can be configured through programming; the following “DIO” example can be found on the

software DVD at \examples\ExpansionCard\EPM-3438.

Moxa functions for DI/DO

Function HANDLE mxdgio_epm3438_open(int HWIndex);

Description This function opens access to the DIO device.

Input <HWIndex> The first or second EPM-3438 board.

Output None

Return When successful, this function returns an access to the DIO device; otherwise, an error.

Function void mxdgio_close(HANDLE fd);

Description This function closes the access to the DIO device.

Input <fd> The access to the device.

Output None

Return None

Function int mxdgio_get_input_signal(HANDLE fd, int port);

Description This function gets the signal state of a digital input channel.

Input <fd> The access to the device.

<port> port #

Output <state> DIO_HIGH (1) for high, DIO_LOW (0) for low

Return Returns 1 for a high signal or 0 for a low signal, if successful. Otherwise, it returns a value of -1.