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22 SPAN-IGM User Manual Rev 2
Chapter 2 SPAN Installation
2.3.8 COM3 Serial Port
The COM3 serial port is multiplexed with the USB port, so only one of these two ports can be enabled at
a time.
The USB port is enabled by default. If the system configuration requires an additional serial connection,
disable the USB port and the EVENT1 (MARK1) input and enable the COM3 port.
2.3.8.1 Enable the COM3 Serial Port
To enable COM3, issue the following commands:
ENCLOSURECOMSELECT COM3
SAVECONFIG (optional)
The command above also disables the EVENT1 input.
2.3.8.2 Connect the COM3 Serial Port
If using a NovAtel interface cable (part number 01019015):
1. Connect the interface cable to the AUX connector on the SPAN-IGM.
2. Connect the COM3 Port connector on the cable to the communication device.
If creating a custom interface cable, refer to Appendix A, Technical Specifications on page 52 for the AUX
connector pin out.
2.3.8.3 Disable the COM3 Serial Port
If the system configuration changes and the USB port is needed instead of the COM3 port, disable the
COM3 port and enable the USB port.
ENCLOSURECOMSELECT USB
SAVECONFIG (optional)
The command above also enables the EVENT1 input.
2.3.9 Enable RS-422 serial connections
The User port (COM2) and the MIC port can operate as either RS-232 or RS-422 serial ports. By default,
both ports operate as RS-232.
For the User port, the standard used is determined by the Mode1 pin on the Main connector.
• When the Mode1 pin is left open or tied high, the User port operates as an RS-232 serial port.
• When the Mode1 pin is tied low, the User port operates as an RS-422 serial port.
For the MIC port, the standard used is determined by the Mode2 pin on the Main connector.
• When the Mode2 pin is left open or tied high, the MIC port operates as an RS-232 serial port.
• When the Mode2 pin is tied low, the MIC port operates as an RS-422 serial port.
The Mode2 pin also enables and disables the CAN bus port.
• When the Mode2 pin is left open or tied high, the CAN bus port is enabled.
• When the Mode2 pin is tied low, the CAN bus port is disabled.
When the serial ports are switched to RS-422, there are changes to the pinout on the Main
connector. For information about the changes, see SPAN-IGM Ports on page 56.