USB-I/O Interface Adapter GPIO-24. Programmer's Reference Manual.
4.1. GPIO_GET_FW_VER (0x0B)
Each single GPIO-24 adapter has its unique serial number (SN). It is assigned during manufacturing and identifies the adapter. The SN of the GPIO-24 adapter is a 4-byte number. The GPIO_GET_SN command retrieves the serial number of the GPIO-24 adapter.
GPIO_GET_SN Command
| Byte 0 | GPIO_GET_SN | Command ID (0x0C). |
| Byte 1 | ECHO | Echo to associate a command with the response. |
| Bytes 2..7 | Reserved | Reserved (must be 0). |
Command is an 8-byte array of the following format:
- Byte 0: GPIO_GET_SN (0x0C)
This byte contains command ID (command type). It should be set to 0x0C.
- Byte 1: ECHO
This byte is used to associate a response received from GPIO-24 adapter with a specific command. Response will contain exactly the same value in its echo byte.
- Bytes 2..7: Reserved
These bytes are reserved for future usage and must be set to 0.
For convenience GPIO_GET_SN_CMD structure is declared in reports.h file.
GPIO-24 adapter sends GPIO_GET_SN response after command execution. Device serial number is specified inside the response.
GPIO_GET_SN Response
| Byte 0 | GPIO_GET_CFG | Response ID (0x0C). |
| Byte 1 | ECHO | Echo to associate a command with the response. |
| Byte 2 | ST | Command execution status. |
| Byte 3 | UPPER_SN | UPPER_SN byte. |
| Byte 4 | HI_SN | HI_SN byte. |
| Byte 5 | LOW_SN | LOW_SN byte. |
| Byte 6 | LOWEST SN | LOWEST_SN byte. |
| Byte 7 | Reserved | Reserved |
Response is an 8-byte array of the following format:
- Byte 0: GPIO_GET_SN (0x0C)
Response ID (response type). This byte will contain 0x0C.
- Byte 1: ECHO
Echo byte copied from the corresponding command. It is used to associate the response with the specific command.
- Byte 2: ST
Status of the command execution:
GPIO_ST_SUCCESS (0x00) – The
I/Opins output values were successfully configured.GPIO_ST_INVALID_PORT (0x03) – Invalid port number has been specified.
- Byte 3..6: Serial Number bytes:
SN of the GPIO-24 adapter is a 4-byte number. GPIO_GET_SN response serial number consists of following bytes:
UPPER_SN
HI_SN
LOW_SN
LOWEST_SN
- Byte 7: Reserved
This byte is reserved for future usage.
For convenience GPIO_GET_SN_RSP structure is declared in reports.h file.
