USB-I/O Interface Adapter GPIO-24. Programmer's Reference Manual.
11.10. GPIO_RESET_PLS_CNT (0x2C)
GPIO-24 adapter can send GPIO_EV_PLS_CNT event to your application.
You can configure event generation conditions with GPIO_SET_PLS_CNT_CFG command. For more detailed information see Section 11.2, “Pulse Counter Event”.
| Byte 0 | GPIO_EV_PLS_CNT | Event ID (0x86) |
| Byte 1 | CNT | Events counter |
| Byte 2 | EVENT_TYPE | Cause of the event |
| Byte 3 | PLS_CNT_NUMBER | ID number of the pulse counter, which has generated the event |
| Byte 4 | VALUE[0] | Current number of detected pulses or elapsed time |
| Byte 5 | VALUE[1] | |
| Byte 6 | VALUE[2] | |
| Byte 7 | VALUE_TYPE | Type of returned value (current number of detected pulses or elapsed time) |
Event is an 8-byte array of the following format:
- Byte 0: GPIO_EV_PLS_CNT (0x86)
Event ID (event type). This byte will contain 0x86.
- Byte 1: CNT
Events counter value.
USB-I/Oadapter increments event counter with every event.- Byte 2: EVENT_TYPE
This byte may contain one of three possible values:
GPIO_PLS_CNT_EV_OVERFLOW (1) – maximum number of pulses (16,777,215) is reached.
GPIO_PLS_CNT_EV_REPEAT (2) – the event is sent periodically.
GPIO_PLS_CNT_EV_MATCH (3) – user-defined measurement limits are reached: time period is exceeded (Time Based Mode:) or threshold number of pulses is detected (Pulse Based Mode:).
- Byte 3: PLS_CNT_NUMBER
The ID number of the pulse counter, which has generated the event:
0 – pulse counter on A.3 pin;
1 – pulse counter on A.4 pin.
- Bytes 4..6: VALUE
If Byte 7: VALUE_TYPE equals to GPIO_PLS_CNT_VAL_TIME (1), Bytes 4..6: VALUE contain the time period in units of 10 ms, that have passed since last reset of the pulse counter.
If Byte 7: VALUE_TYPE equals to GPIO_PLS_CNT_VAL_PULSES (0), Bytes 4..6: VALUE contain current number of pulses counted since last reset of the pulse counter.
Byte 6: VALUE[0] – most significant byte (high byte).
Byte 5: VALUE[1] – middle byte.
Byte 4: VALUE[2] – least significant byte (low byte).
- Byte 7: VALUE_TYPE
The type of value specified in Bytes 4..6: VALUE:
GPIO_PLS_CNT_VAL_PULSES (0) – Bytes 4..6: VALUE contain the number of detected pulses.
GPIO_PLS_CNT_VAL_TIME (1) – Bytes 4..6: VALUE contain the elapsed time in units of 10 ms.
For convenience GPIO_EV_PLS_CNT structure is declared in reports.h file.
