Rockwell Automation 2755 AdaptaScan Software - Manual (Page 111)

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Publication 2755-838
Terminal block connections in the wiring base provide all power,
I/O, and communication links to a Reader. The RS-422/RS-485 or
RS-232 port may be used at the same time as the DeviceNet link.
DeviceNet
Supports multiple Readers and allows them to communicate with
other devices on the network. The DeviceNet cable consist of four
wires (2 power and 2 communications) and a shield connected to the
Reader wiring base.
RS-422 / RS-485 Port
An RS-422 / RS-485 port allows multidrop communications with a
single device or network such as a SLC 500 DH-485 network.
RS-232 Port
Provides point-to-point communications with a device having an
RS-232 port such as a PLC-5 Channel 0 port configured for RS-232.
Note: The Configuration Port Connector on the Reader is used to
download configurations, not the RS-232 connection.
The RS-485/RS-422 and RS-232 serial ports support these protocols.
Terminal
Use dumb terminal (ASCII) protocol to communicate with a variety
of devices. This is the least secure of the protocols.
DF1
Use DF1 protocol to communicate with devices such as a PLC-5 that
also supports DF1 protocol. DF1 protocol provides error checking
capabilities.
DH-485
Use DH485 protocol to communicate with DH485 devices such as
an SLC 500 DH485 network or point-to-point link.
Communication Ports
Protocols