Allen-Bradley 2755-DS1A Product Data page 5

AUX Port
The AUX port communicates with a standard ASCII terminal using the
RS-232 interface. This terminal is referred to as the AUX terminal. The
AUX port can switch between two modes of operation.
Decoder Configuration
The ASCII terminal is used to access built-in setup menus to configure
and monitor decoder operations; format and configure host
communications; and display bar code data, output counters and decoder
status.
Manual Data Entry
The ASCII terminal is used to:
– enter data at the keyboard when the unattended scanners cannot read a
label. This feature is useful when labels are damaged or missing.
– display messages from the host.
– display bar code data, output counters and decoder status.
The decoder features an AUX Terminal jumper on the main logic board to
switch between configuration and manual data entry operations. Another
way to switch between these two modes is to connect specific pins in the
AUX port connector. The port and logic board jumpers are initially set for
decoder configuration operations.
HOST Port
The HOST port supports RS-232, RS-422, and DH485 (Allen-Bradley
multidrop interface). The HOST port allows the exchange of commands and
data between the decoder and a host computer or Allen-Bradley PLC
controller.
Power Connector and On/Off Switch
The NEMA Type 1 decoder uses an IEC 320 power entry connector.
The NEMA Type 4 decoder uses an environmental 3-pin connector with a
separate ON/OFF toggle switch (that is sealed to comply with NEMA
Type 4 standards).
The power cords available for each decoder are listed under the
Accessories Section.
Product Data
Bulletin 2755
Single/Dual-Head Enhanced Bar Code Decoders
5