User`s guide

10-2
DCM-200 9-Pin ‘D’ Connector 25-Pin ‘D’ Connector
TB2-1 (Tx) 2 3
TB2-4 (Rx) 3 2
TB2-6 (GND) 5 5
Table 10-1
Typical Connections to a Personal Computer
10.4 Starting Direct Radio Communications Mode
1) Using the MP32 configuration software and the Metretek programming cable,
load the V2.4 or higher firmware into the DCM-200 following the instructions in
Chapter-5. It is not necessary to change the Configuration of the unit if it has
already been programmed.
2) Read the Configuration using MP32 and the programming cable. Note the Serial
Port settings. Your computer or dumb terminal will need to be configured to
match these settings. If the DCM-200 hasn’t been programmed, set the baud
rate to 9600 or 19200, 1 stop bit, no parity and 8 data bits.
3) See Figure 10-2. Use a coin, screwdriver or other metallic object to short out the
CALL jumper. While still shorted, reset the unit by either cycling power or by
shorting Pins-5 & 6 of the programming port.
4) Both the green and red LEDs should starting flashing together twice per second.
At this point you can remove the short from the CALL jumper.
5) Configure your dumb terminal or computer to match the serial settings (baud
rate, etc.) of the DCM-200.
6) You can now directly issue commands to the Motorola radio and observe its
responses. A list of supported commands can be found in Motorola’s 98-
08901C39 manual (g18 radio) or 98-08901C68 manual (g20 radio).
7) A reset or a power cycle will return the DCM-200 to normal operation.