Trans-Cal SSD120-N-RS5, Owners & Installation Manual, Page: 13 / 57

grounds on the 15 pin D-subminiature connector are internally connected to ground and
may be used to ground protocol pins, as well as provide data ground to the receiving GPS
or other device. Pin 3 (RxD) of the 15-pin serial data connector is used for calibration only.
See
Table IX
for connector pin assignments and
§4.6
through
§4.10
for software assigned
protocols. Shielded cable is recommended for both serial and parallel data wiring
harnesses.
3.3 Serial Altitude Data Port Test Equipment
The output of the serial port may, or may not be directly displayed by the GPS or
other device receiving the serial data. There are several ways to test the output of the
serial port:
a) Use a TCI Model ATS-400 Test Set to display the serial altitude data.
b) Connect to an open serial port on a personal computer using serial data
capture software such as PROCOMM™, VERSATERM™, SOFTWARE WEDGE™,
TERMINAL (Windows® 3.x) or HYPERTERMINAL (Windows® 95, 98, 2000 or XP.)
c) Use a dedicated serial data test box such as the BLACK BOX™ RS232
Monitor.
d) Test for serial output using an oscilloscope to view the 9 Vdc square wave
group transmitted about twice a second.
3.4 Parallel ICAO Altitude Data Port Test Equipment
The output of the parallel ICAO altitude data may be monitored by any number of
transponder ramp test sets, which allow display of the ICAO altitude digitizer/encoder code.
The IFR Model ATC-600A Portable Transponder Test Set is one example. Alternatively,
the Trans-Cal Industries’ ATS-400 or EET-200 may be used to display the parallel data.
SERI AL DATA
RECEPTACLE DA-15S
PARALLEL DATA AND POWER
CONNECTOR DA-15P
Page 13 of 57