NE-4100 Series User’s Manual
DIO Commands
D-3
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(DIOHeader1, 0);
//Send TCP Packet
// Process the returned data here.
return
TRUE;
}
Write Single DIO
Command
Byte #
Descriptor
Value
Description
1 Header 2
command
number,
fixed
2 Header 2
version,
fixed
3
Header
(any)
this byte is only used in the module’s response
4
Header
3
data length, fixed
5
Data
0,1,2,3
desired DIO channel number
6 Data
0,
1
0: set to input mode
1: set to output mode
7 Data
0,
1
this byte is ignored for input mode
0: set to low
1: set to high
For example, the 7-byte command sequence
2-2-0-3-0-0-0
requests that DIO 0 be set to digital
input mode.
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 7-byte response sequence
2-2-0-3-0-0-0
indicates that DIO 0 has been changed to
input mode.
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