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1.6 Serial Port Altitude Data Resolution
The default resolution of the altitude digitizer serial data is 100 feet. To enable 10-foot
resolution, connect pin 2 of the DA-15S D-Subminiature connector to ground (see Table
VIII.) The serial port resolution may also be configured via software, see §4.6. See §4.7 for
one-foot resolution.
1.7 Serial Communication Format
Model SSD120-(XX)N( )-RS5 carries out serial communication asynchronously with the
"Start/Stop" system. The specifics of the format, ie. the number of data bits, baud rate etc.,
is determined by the protocol selected. The default protocol is 1200bps, 8 data bits, 1 stop
bit and no parity.
1.8 Serial Communication Protocol
Refer to Table IX & X and §4.6 & §4.7 & §4.10
Protocol is user selectable by grounding or leaving open pin 9 or pin 10 of the DA-15S
serial data D-Subminiature receptacle, or by selecting protocols via software see §4.6.
1.8.1 UPS Aviation Technologies/Garmin AT/IIMorrow Nav. Devices.
Leaving pin 9 and 10 of the DA-15S serial data receptacle open results in a protocol
compatible with UPS Aviation Technologies' (IIMorrow) Navigation devices. The Digitizer
will send a seventeen byte message beginning with # AL, then a space followed by five
altitude bytes; the letter "T" and the sensor temperature, two checksum bytes and a
carriage return. (1200bps, 8 data bits, 1 stop bit, no parity). The following is an example of
the serial message for UPS AT (Garmin AT) (IIMorrow) devices.
Message
#AL +00800T+25D8
1.8.2 Trimble Garmin Navigation Devices Protocol
Grounding pin 10 of the DA-15S serial data receptacle results in a protocol compatible with
some navigation devices manufactured by Trimble and Garmin. The Digitizer will send a
ten-byte message. The message begins with ALT followed by a space and five altitude
bytes; concluding with a carriage return. (9600bps, 8 data bits, 1 stop bit, no parity). The
following are examples of serial messages for Trimble or Garmin devices:
Message
ALT -9900
ALT 10500
Definition
C
Pressure Altitude 800 feet
R
C
Digitizer disabled.
R
C
Pressure Altitude 10,500 feet
R
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Definition
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