Rockwell Automation 160 RSI SERIAL COMM MODULE - Manual (Page 20)

4–2 Modes of Operation
Modes of Operation The RS1 Module has three modes of operation.
• Power-up mode
• Run mode
• Error mode
Power-up Mode
The following sequence of operation occurs:
1. During power-up, the READY LED illuminates.
2. The module reads and stores the DIP switch settings.
If the power-up sequence is successful, the module enters the run
mode and the COMM LED flashes green or turns solid green.
If the power-up sequence fails, the COMM LED will go to solid red
and the module will enter the Error Mode. See the Error Mode
description in this section.
Run Mode
After a successful power-up, the RS1 Module enters the run mode
and operates as a slave device to a master device. In run mode, the
module:
• Accepts and responds to messages from the master on the
network.
• Monitors cable integrity.
If an error is detected, the module enters error mode (see below).
Error Mode
If the module detects an error, the COMM LED flashes red or turns
solid red. Refer to Chapter 9 for details on how to recover from an
error.