User's Manual

14221-1200-4010, Rev. B

14. GPS NMEA-FORMATTED SERIAL DATA CONNECTION

To obtain GPS NMEA-formatted serial data from the MRU, use the following procedure to complete the

serial data connections:

1. Connect the DB-9 female connector labeled “GPS” of Interface Cable to the computer’s serial port

DB-9 male connector—either directly or extended via a serial cable. Serial Programming Cable

CA-013671-020 (20 feet) can be used to extend the length; see Section 13.1 for additional

information.

2. Tighten the screws firmly, and then route the cabling as required.

If the computer is not equipped with a DB-9 serial port connector, a suitable adapter is required, such

as USB-to-RS-232 Adapter Cable, Harris part number CN24741-0001.

3. Follow the manufacturer’s instructions on processing the NMEA-formatted GPS data from the radio.

Industry software to process GPS information through this interface is not supported by

Harris.

15. MOBILE DATA CONNECTION

If the radio installation must support mobile data communications of a computer running Mobile Data

Terminal (MDT) or similar software, use the following procedure to connect the computer to the radio:

1. Obtain the Serial Programming cable CA-013671-020 (or equivalent). This is a 20-foot-long standard

serial data cable. It is shown in Figure 13-1 on page 68.

2. Connect this cable’s male DB-9 connector to the female DB-9 connector on the rear of the MRU

radio (XG-100M). Tighten the two (2) connector jackscrews.

3. Route the cable through the vehicle’s interior wire/cable channeling to the computer.

Remove interior panels, door kick panels, etc., as necessary. Protect the cable from possible chafing

and tie-and-stow it as necessary.

4. Connect the cable’s female DB-9 connector to the computer.

If the computer is not equipped with a DB-9 serial port connector, a suitable adapter is required, such

as USB-to-RS-232 Adapter Cable, Harris part number CN24741-0001.

Mobile data should not be obtained from the CH-721 control head.

Before data communications can occur on a P25 system, the respective data option must be

enabled. Contact the Technical Assistance Center (TAC) for additional information. TAC

contact information is included on page 21.

NOTE