Moxa Technologies NE-4100 user manual Command Code Usage Reading Single DIO Parameters

NE-4100 Series User’s Manual	DIO Commands
//define DIO Packet format
//Used for Command and ACK packet
typedef struct _DIO_Packet_Struct {
DIOHeaderStructheader;
char data[255];
} DIOPacketStruct, *pDIOPacketStruct;

Command Code Usage

1.Reading Single DIO Parameters:

Command code: 1(hex)

Version: 2(hex)

Command Status: doesn’t matter

Length of data: 1(hex), represents one byte.

data[0]: Fill in the number of the DIO you wish to access. The DIO number starts from 0(hex). Return:

Command Status: Check the Command Status code on the previous page.

Length of data: 3(hex). Must be 3 bytes of return code in this mode.

data[0]: The number of the DIO you wish to access.

data[1]: DIO mode(hex), 0 for IN, 1 for OUT

data[2]: DIO status(hex), 0 for LOW, 1 for HIGH

C code example:

BOOL ReadSingleDIO(int port, int *mode, int *status)

{

DIOPacketStruct packet;

packet.header.command = 1;	// read single DIO command
packet.header.version = 2;	// DIO protocol version
packet.header.length = 1;	// data length
packet.data[0] = (char)port;	// Number of the DIO

send(SocketFd, (char *)&packet, sizeof(DIOHeaderStruct)+1, 0); //Send TCP Packet

//Process the returned data here. return TRUE;

}

2.Writing a Single DIO Parameters:

Command code: 2(hex)

Version: 2(hex)

Command Status: doesn’t matter

Length of data: 3(hex); represents three bytes.

data[0]: The number of the DIO you wish to access.

data[1]: DIO mode(hex), 0 for IN, 1 for OUT

data[2]: DIO status(hex), 0 for LOW, 1 for HIGH Return:

Command Status: Check the Command Status code on the previous page.

Length of data: 3(hex). Must be 3 bytes of return code in this mode.

data[0]: The number of the DIO you wish to access.

data[1]: DIO mode(hex), 0 for IN, 1 for OUT

data[2]: DIO status(hex), 0 for LOW, 1 for HIGH

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