Trans-Cal SSD120-N-RS5, Инструкция для владельца и по установке, Страница: 8 / 57

Page 8 of 57
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 Definition
#AL +25D8
C
R
Pressure Altitude 800 feet
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 Definition
ALT -9900
C
R
Digitizer disabled.
ALT 10500
C
R
Pressure Altitude 10,500 feet