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Appendix D. RS-232 and RS-485 Operation
D-6
summarizes the settings that can be changed using the SR50AT
RS-232 or RS-485 operating modes. Recommended changes are shown in
parenthesis.
TABLE D-5. RS-232 and RS-485 Settings
Setting Description
Options
Default Value
Baud Rate
1200
4800
9600
19200
38400
9600 bps
Address RS-232/RS-485
Any two Alphanumeric Characters
33
Serial Operational Mode
Measure on Poll
Auto Measure Auto Output
Auto Measure Polled Output
Auto Measure Auto Output
(Change this to Measure on Poll.)
Distance to Target or
Depth output
Distance to Target
Depth
Distance to Target
Distance to Ground
Decimal Value in Met
re
s
0.0
Measurement Interval Units
Seconds
Minutes
Hours
Seconds
Measurement Interval Value
Integer 1-255
60
Output Unit
Met
res
Centimet
re
s
Millimet
re
s
Feet
Inches
Met
re
s
Setting Description
Options
Default Value
Quality Output
On
Off
Off
(Change this to ON.)
Temperature Output
On
Off
Off
Output valid only for the SR50ATT
Diagnostics Output
On
Off
Off
(Change this to ON.)
D.4.1 Baud Rate Setting
The factory default baud rate setting of 9600 bps is suitable for most
applications. Lower baud rates (1200 or 4800 bps) may improve
communication reliability or allow for longer cable lengths. Higher baud rates
(19200 or 38400 bps) may be used where faster communications are required.
The quiescent current draw for the SR50AT in serial mode is normally 1.25
mA for baud rates of 9600 or less. The current draw increases to 1.5 and 2.25
mA for the baud rates of 19200 or 38400 bps, respectively.