114 LXE Diagnostics
MX3 Reference Guide E-EQ-MX3RG-J-ARC
Communication Port Utility (COMTST81.EXE)
This command is run at the DOS prompt. There are no parameters. The program requires LXE
cable part number 155746-0001.
This command file is used to test the TX, RX and handshaking lines of the unit’s COM port. A
loopback connector is needed to perform this test. The configuration of the connector for the RS-
232 endcap follows.
Note: The optional endcap with an RS-232 serial port, when installed in the MX3, is COM1 or
COM2. The MX3’s IR Port is COM2.
RS-232 Endcap Connector
Figure 5-1 RS-232 Serial Connector (COM1 or COM2)
Pin Signal Description
1 DCD Data Carrier Detect – Not Connected
2 RXD Receive Data – Input
3 TXD Transmit Data – Output
4 DTR Data Terminal Ready – Not Connected
5 GND Signal/Power Ground
6 DSR Data Set Ready – Not Connected
7 RTS Request to Send – Output
8 CTS Clear to Send – Input
9 RI
or
+5V DC
Ring Indicator – Input (Default)
or
Bar Code Scanner Power -400mA max
(Use BIOS Setup software to configure)
RS-232 Endcap COM Port
Loopback Configuration
7 RTS CTS 8
3 TX RX 2
Figure 5-2 RS-232 Endcap COM Port Loopback Configuration
