NE-4100 Series User’s Manual DIO Commands
D-2
C Code Example
//define DIO Header format
typedef struct _DIO_Header_Struct {
char command;
char version; /* This specification is version 2 */
char status;
char length;
} DIOHeaderStruct, *pDIOHeaderStruct;
//define DIO Packet format
//Used for Command and ACK packet
typedef struct _DIO_Packet_Struct {
DIOHeaderStruct header;
Char data[ 255];
} DIOPacketStruct, *pDIOPacketStruct;
Read Single DIO
Command
Byte # Descriptor Value Description
1 Header 1 command #, fixed
2 Header 2 version, fixed
3 Header (any) this byte is only used in the module’s response
4 Header 1 data length, fixed
5 Data 0, 1, 2, 3 desired DIO channel #
For example, the 5-byte command sequence 1-2-0-1-0 requests the status of DIO 0.
Response
Byte # Descriptor Value Description
1 Header 1 command #, 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 is in input mode
1: channel is in output mode
7 Data 0, 1
0: channel status is low
1: channel status is high
For example, the 7-byte response sequence 1-2-0-3-0-0-0 indicates that DIO 0 is in input mode.
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