read_io_channel — Read a value from the specified I/O channels.
read_io_channel reads input values from the specified transmission channels. The channels are passed in IOChannelHandle and can be opened and configured by open_io_channel, the values are returned in Value. The parameter Status returns for each read value in Value a quality message. The value 0 indicates that the corresponding value of Value could be read. Any other status value depends on the interface. Please refer to the interface-specific documentation in the directory 'doc/html/reference/io' for further explanation.
Handles of the opened I/O channels.
Status of read value.
If the parameters are valid, the operator read_io_channel returns the value 2 (H_MSG_TRUE). If necessary an exception is raised. In this case, an extended error information may be set and can be queried with the operator get_extended_error_info.
write_io_channel, query_io_device, set_io_channel_param