Moxa Technologies MiiNePort E2-H - Response; C Code Example; Read Multiple Dios; Command

MiiNePort E2/E3 DIO Commands
D-4
Response
Byte # Descriptor Value Description
1 Header 2 command number, fixed
2 Header 2 version, fixed
3 Header 0, 1, 2, 3,
4, 5, 6,
0xFF
command status/error code (0 = okay)
4 Header 3 data length, fixed
5 Data 0, 1, 2, 3 desired DIO channel #
6 Data 0, 1 0: channel has been changed to input mode
1: channel has been changed to output mode
7 Data 0, 1 this byte is ignored for input mode
0: channel status has been changed to low
1: channel status has been changed to high
For example, the seven-byte response sequence 2-2-0-3-0-0-0 indicates that DIO 0 has been changed to input
mode.
C Code Example
void WriteSingleDIO(int port, int mode, int status)
{
DIOPacketStruct packet;
packet.header.command = 2; // write single DIO command
packet.header.version = 2; // DIO protocol version
packet.header.length = 3; // data length
packet.data[0] = (char)port; // number of the DIO
packet.data[1] = (char)mode; // DIO mode
packet.data[2] = (char)status; // DIO status;
send(SocketFd, (char *)&packet, sizeof(DIOHeaderStruct)+3, 0);
//Send TCP packet
//Process the returned data here
}
Read Multiple DIOs
Command
Byte # Descriptor Value Description
1 Header 5 command number, fixed
2 Header 2 version, fixed
3 Header (any) this byte is only used in the module’s response
4
Header
2
data length, fixed
5 Data 0, 1, 2 starting DIO channel number
6 Data 1, 2, 3 ending DIO channel number
This command requests the status of a range of DIO channels, specified in bytes 5 and 6. For example, the
six-byte command sequence 5-2-0-2-0-2 requests the status of DIO channels 0 through 2.