TB7300 Installation and Operation Manual Appendix C Testing with the TBA0STU Calibration Test Unit 89
© Tait International Limited December 2022
Checking Digital Programming Input Switches
There are 10 switches connected to digital I/Os (DIO) 3 to 12.
DIO3 is connected to switch 1 and DIO12 to switch 10.
By default, the base station digital inputs are active low, so moving the
switches to the down (0) position will activate the digital input. Setting the
digital input for active high will activate the digital input with the switch in
the up (1) position.
LEDs on the WebUI indicate the input and output states.
Checking Digital Output LEDS 1 and 2
These LEDS are connected to DIO1 and DIO2 and will light if the outputs
are active low.
There are no switches connected to DIO1 and DIO2, so alarms and task
builder applications using these inputs cannot be tested with the CTU.
Notice There is a central ground banana socket that is 19.6mm
(0.75”) spacing from the RX gate, TX relay, TX Key and RSSI connec-
tors to enable a dual banana plug to be used for signal output and
ground. The banana sockets on each system IO can be used for timing
and other tests of the base station.
Monitoring RX Gate Output
An LED will indicate when the RX gate output has activated, the RX gate
output is active low.
RX Gate only works in analog mode.
Checking RSSI Levels
A voltage proportional to the received RF signal level is available on this
output.
RSSI is the only output that is functional in analog, P25 and DMR modes.
Checking TX Relay
An LED will indicate when the antenna (simplex) relay is active. From
version 3.25 firmware (and later) this output can be accessed as digital
output 13 on TaskBuilder.
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