55 Communicator | 3.05
5. Go over the number of controllers and make sure there is no conflict between the units (make
sure that two units do not have the same configuration number).
6. If all above are OK:
a) Check the wiring for 232/485 communication card.
b) Check RF card signal strength (refer to Testing the Cellular Signal Strength, page 17).
'Lost unit number' alarm
1. Verify that the Communicator is connected to a power supply.
2. Press Hot Key 0 (page 28) and check if either some or all of the controllers are missing (empty
squares).
3. Verify communication with the missing unit:
a) If the system has a wired connection, go to System – Test – Wired RS232/485 (refer
to page 34).
b) If the system has an RF link, go to Radio System – Test Radio RF Signal (Refer to
page 34).
4. If you are using a 232/485 communication card, check the Baud Rate on both sides (refer to
Routing Methods, page 26).
5. If an RF communication card is being used, check Additional Channel Setting (refer to Routing
Methods, page 26).
6. Go over the controller numbers and make sure there is no conflict between the units (make
sure two units do not have the same configuration number).
7. If all above are Ok:
a) Make sure the wiring is OK for communication card 232/485.
b) Check signal strength for RF card (refer to Testing the Cellular Signal Strength, page
17).
No local communication with PC
1. Ensure that the serial port Baud Rate matches the PC baud rate (refer to Routing Methods,
page 26).
2. Go to Computer Port list. 'Com 1 RD' LED should flash on the front panel. Test the
communicator through RotemNet software.
NOTE: If the LED does not flash, it is not the right computer port.
3. If using a USB cable, reinstall the driver from the CD (refer to USB Driver Installation, page 49).
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