34 TA2922 Universal Line Interface Service Manual
© Tait Electronics Limited March 2010
serial data to and from the radio internal option serial port through to the outside
world. See “Powerup Serial Timer Enable” on page 43.
In this configuration the same external TX and RX data lines are used for
programming, but a power up timer allows a short period of time where the
programming application may read or write to the TA2922 shortly after power on.
The serial TX and RX port may optionally be configured for 3.3V TTL operation
as opposed to RS-232 with a different component population.
W RADIO DATA OUT
■ Signal direction: output
■ Signal level: -10 to +10V
■ Signal impedance: < 1k ohms
RS-232 data from TA2922 board to PC for programming parameters and option
board software upgrades. The TA2922 may be configured to transparently pass
serial data to and from the radio internal option serial port through to the outside
world. See “Powerup Serial Timer Enable” on page 43.
In this configuration the same external TX and RX data lines are used for
programming, but a power up timer allows a short period of time where the
programming application may read or write to the TA2922 shortly after power on.
The serial TX and RX port may optionally be configured for 3.3V TTL operation
as opposed to RS-232 with a different component population.
XRTS IN
■ Signal direction: input
■ Signal level: -10 to +10V
■ Signal impedance: 5k ohms
RS-232 ‘ready to send’ flow control input from PC to TA2922 board. This feature
is not implemented in software at time of release and may be included in a future
software release.
Y CTS OUT
■ Signal direction: output
■ Signal level: -10 to +10V
■ Signal impedance: < 1k ohms
RS-232 ‘clear to send’ flow control output from TA2922 board to PC. This feature
is not implemented in software at time of release and may be included in a future
software release.
Z AUX I/O
■ Signal direction: bidirectional
■ Signal level: N/A
■ Signal impedance: 50 ohms
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