Rockwell Automation 2755 AdaptaScan Bar Code Readers - Manual (Page 21)

Overview 1–13
RS-232
The RS-232 port provides point-to-point communications with a
device having an RS-232 port, such as a PLC-5 Channel 0 port or
computer.
RS-232
PLC-5
Channel 0
(Configured for RS-232)
Reader
Protocols
The RS-485/RS-422 and RS-232 serial ports support these protocols.
Protocol Description
Allen-Bradley
DF1
A peer-to-peer protocol that combines features of ANSI X3.28-1976
specification subcategories D1 (data transparency) and F1 (two-way
simultaneous transmission with embedded responses).
Allen-Bradley
DH485
A network protocol that allows DH485 devices (using the RS-485 stan-
dard) to communicate on the Allen-Bradley DH485 link.
Terminal
Provides a simple interface to most serial devices. This is the least se-
cure protocol since it does not confirm the delivery or accuracy of mes-
sages. If security is required, we recommend that you use DF1 protocol
with Block Check Characters (BCC) and ACK/NAK handshaking.