Impulse 463E - Manual (Page 78)

© Sealevel Systems, Inc. - 75 - SeaI/O User Manual
Retrieve Module PIO Configuration
Which IOCTL_GET_PIO (4)
Description Requests from the SeaIO module the IO space configuration, as
well as the module model.
The last parameter is expected to be a pointer to a ‘seaio_ioctl_s’
structure. Firstly, the u.pio.model will be populated on return with
an integer representation of the SeaIO module model number.
Secondly, depending on the model, several fields may be
populated. For the 462/463 models, the
u.pio.config_state.PIO96.channel1 and
u.pio.config_state.PIO96.channel2 fields will each contain a one-
byte representation of the IO direction of 6 ports.
The ‘Set PIO Config’ section under Modbus commands better
describes the returned data format.
Models SeaIO 462 / 463
Expected
Data Type Pointer to a seaio_ioctl_s structure
Return Codes -22 EINVAL A NULL pointer has been supplied where a
pointer to a data buffer was expected.
≥ 0 Success
( Reference the return values for both Read( ) and Write( ) )