SeaIO 462

Modbus Function	Valid Range	Description
(0x01) Read Coils	0 - 95	Reads the state of TTL outputs, skipping over inputs. Uses absolute addressing. Usable with 1 or 8 outputs only. Must start at a multiple of 8 when reading 8 outputs. (ie. 16-23)
(0x02) Read Discrete Inputs	0 - 95	Reads the TTL inputs, skipping over outputs. Uses absolute addressing. Usable with 1 or 8 inputs only. Must start at a multiple of 8 when reading 8 inputs. (ie. 16-23)
(0x05) Write Single Coil	0 - 95	Writes to a single TTL output. Uses absolute addressing.
(0x0F) Write Multiple Coils	0 - 95	Writes multiple TTL outputs, skipping over inputs. Uses absolute addressing. Usable with 1 or 8 outputs only. Must start at a multiple of 8 when writing 8 outputs. (ie. 16-23)
(0x41) Read Programmable IO	n/a	Reads the entire 96-bit I/O space.
(0x42) Write Programmable IO	n/a	Writes the entire 96-bit I/O space, masking out inputs.
(0x03) Read Holding Registers	0 - 8	Reads the state of the SeaIO 462 / 463 Holding Register Set.
(0x06) Write Single Register	1 - 8	Configures the module based on the SeaIO 462 / 463 Holding Register Set