The type of read / write to preform. Note that not all types can be written. For example an attempt to write to D_INPUTS or INPUTREG would cause an EINVAL error. Also you can not directly write to SETUPREGS, you must use an appropriate Ioctl.
- Enumerator:
| COILS |
Coils are any relay type outputs.
|
| D_INPUTS |
Digitial inputs. Single bit inputs.
|
| HOLDINGREG |
Configuration registers.
|
| INPUTREG |
Registers only used on A/D type devices.
|
| SETUPREG |
Advanced device configuration registers.
|
| SEAMAXPIO |
Programmable type I/O.
|