User manual

4.3.1.2.2.1 EXTERNAL I/O 1 (GREEN)
These radio buttons select configuration of Pin 3 on the Power - I/O Connector (green wire):
 Analog Input
An option on units not equipped with the cooling fan option - can be used to monitor an external voltage (0 to 10
volts). Monitoring is from the Offline Diagnostics screen
 Tx Controlled Fan
Selecting this option will cause the unit to turn the fan ON at the start of a transmission and OFF after a
predetermined timeout (TX Controlled Fan Timeout) at the completion of a transmission. The length of time the
fan is on is the length of the transmission plus the timeout time. This option is displayed for versions of firmware
that support fan control output based on transmissions (Ver 2.04 and later).
 Digital Output
An option for units not equipped with the cooling fan option. This connection can be used to control the open-
collector transistor on the connector. The open-collector output can sink a maximum current of 100 mA when the
modem board rev is 0 or 1. The output is controlled from the Offline Diagnostics screen. Error! Reference source
not found. shows the Field Programming Software interface for Digital I/O.
 Channel Select 1
For use with models NOT equipped with the cooling option. This setting will configure the connection to be an
analog input for 2 or 4 Channel Select Mode. If Channel Select 2 is NOT selected, this input and Channel Select 2
input selects between Channels 1, 2, 3 and 4. A low level (logic 0) is a voltage less than the Channel Select Voltage
and a high level (logic 1) is a voltage greater than the Channel Select Voltage. The Channel Select Voltage is
selected on the Radio Tab. For 2 Channel Select Mode, see Table 6 "4 Channel Select Mode". If configured as a
Digital Output, the open-collector transistor requires an external pull-up (i.e., resistor) to a voltage of 2 to 10 volts.
 Tx Controlled Fan Timeout
Used to set the interval of time the unit will keep the fan turned ON after a transmission is completed. The range is
5 to 255 seconds in 1 second intervals.
4.3.1.2.2.2 EXTERNAL I/O 2 (WHITE)
These radio buttons select configuration of Pin 4 of the Power - I/O Connector (white wire):
 Analog Input
For use on units not equipped with the cooling option - can be used to monitor an external voltage (0 to 10 volts)
 Rx TP Output
Performs as the demodulated signal level test point. The Rx TP level is half of the internal Rx Test Point
 Ant. SW Control
Supports the use of a redundant base station. Ant. SW Control configuration is dependent on hardware
configuration and should not be changed in the field
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