hostlink.h File Reference

Omron Host Link (C-mode) frame codec (PC_ENABLE_HOSTLINK) - zero-heap ASCII command/response framing for the Omron serial host-link protocol, the RS-232/485 sibling of FINS. More...

#include "protocore_config.h"

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Detailed Description

Omron Host Link (C-mode) frame codec (PC_ENABLE_HOSTLINK) - zero-heap ASCII command/response framing for the Omron serial host-link protocol, the RS-232/485 sibling of FINS.

A Host Link frame is ASCII:

@ UU XX <text> FF * CR

• @ start, UU the 2-digit unit/node number, XX the 2-char header code (e.g. RD), <text> the data, FF the 2-hex-char FCS, then the * + CR (0x0D) terminator.
• FCS = the 8-bit XOR of every character from @ through the last text character, rendered as two uppercase hex digits.
• A response's text begins with a 2-char end code (00 = normal).

This is the frame codec (build + FCS-validated parse); the serial transport is the app's.

Author

Douglas Quigg (dstroy0)

Date

2026

Definition in file hostlink.h.