Rockwell Automation 2755 2D Hand-Held Scanner - Manual (Page 151)

E–6 PLC-5 Controller Application
Publication 2755-6.7
2. Configure Channel 0 in the User Mode Channel 0 Configuration
screen.
Note that Termination 1 is set for \0xa or Line Feed [LF], and
Termination 2 is set for \0xd or Carriage Return [CR]. These
terminators, along with the ARL instruction in the PLC-5, allow you
to read one message at a time with [CR] [LF] terminators.