3.3LED Indicators
Eight LED’s on the front of the modem indicate the following states:
Transmit Data 1 | Green | On when modem 1 is transmitting data. |
Receive Data1 | Green | On when a RF carrier of greater than 0.9uV is detected |
PSU 1 | Red | On when Modem 1 power supply is good. |
Fail 1 | Red | On when a fault is detected in Modem 1 |
Data 2 | Green | On when modem 2 is transmitting data. |
Receive Data 2 | Green | On when a RF carrier of greater than 0.9uV is detected |
PSU 2 | Red | On when Modem 2 power supply is good. |
Fail 2 | Red | On when a fault is detected in Modem 2 |
3.4 Fuses |
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Fuse 1 | 1 Amp Fuse for modem 1 PSU | |
Fuse 2 | 1 Amp Fuse for modem 1 PSU | |
3.5Program Switch
Three way switch for changing the parameters of both modem 1 and modem 2.
Central | Run |
Right | Program modem 1 |
Left | Program modem 2 |
3.6Alarm Reset Resets alarm states
3.7Antenna Connections
Two 50 ohm,
Antenna 1 | Socket for Antenna 1 |
Antenna 2 | Socket for Antenna 2 |
3.8Power Supply
Three pin plug for 240V mains power supply is
4.0OPERATION
When power is applied to the Dual Redundant Base Station all the monitored parameters are checked along with the LED’s. If no faults are found modem 1 is enabled. The Duty Cycle Timer is enabled and this then cycles the two modems according to the time set in the service menu. ( 1 to 48 Hours)
If a fault is detected in the operational modem then the Fault LED will light, the Fault Relay will energise, an error code will be set in the service menu and the alternative modem will be selected.
A transmission is started by sending data to RD (pin 2) on the serial communication port. The operational radio modem places this data in the transmitter buffer memory while it checks to see if the RF. channel is free. If it is