User Manual

Page 2-34 Hardware Features
Communication Ports
The Allegro CE has five possible communication ports:
❏ Two 9 pin serial ports (located on the top of the case)
❏ One infrared port (on top of the case)
❏ One USB port (available through the optional USB/Power Dock)
❏ One internal expansion port (available for most expansion pods)
Some of these ports are recessed to protect them in case the Allegro is
dropped. They are also completely sealed.
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▲ 9 Pin Serial Communication Ports
The standard 9 pin serial communication ports (COM1 and COM2)
allow for the simultaneous operation of two serial devices such as
printers, modems, and bar code wands. Additional power is
provided on COM1 to power bar code wands and other sensors. The
data transfer rate on these ports ranges from 300 baud to 115 Kbaud.
Rubber connector protectors keep dirt and moisture out of the ports.
The ports are sealed without the protectors.
Be sure to use the serial communication cable (9 pin to 9 pin)
included with the Allegro to connect the Allegro to a desktop PC. A
wiring diagram of the cable is shown in Chapter 5, Technical Reference.
Note that a standard ‘straight through’ serial cable will not work.
9 Pin D Connector Pinouts
Pin #
1 Data Carrier Detect (DCD) Input
2 Receive Data (RCD) Input
3 Transmit Data (TXD) Output
4 Data Terminal Ready (DTR) Output
5 Ground (GND)
6 Data Set Ready (DSR) Input
7 Request To Send (RTS) Output
8 Clear To Send (CTS) Input
9 Ring Indicator (RI) Input