Campbell Scientific SR50A Distance Sensor - Manual (Page 14)

SR50A Sonic Ranging Sensor
FIGURE 1. SR50A to MD485 Wiring
3.6 RS-232 and RS-485 Settings
Once the jumpers are set for RS-232 operation a terminal program such as
Hyperterminal can be used to change factory default or existing settings. The
following settings apply to Hyperterminal or any other program that is used for
communications.
BAUD Rate Current SR50A Setting Note
Data Bits 8
Parity None
Stop Bits 1
Flow Control None
The factory default BAUD rate is 9600 BAUD. Once the BAUD
rate is changed the new BAUD rate must be used for further
communications to the SR50A. It is important to keep track of
the BAUD rate setting on the SR50A. If the BAUD rate setting
is unknown, we recommend trying the default value of 9600
BAUD. If that does not work, start at BAUD rate 1200 and go
through all the BAUD rate settings until the correct one is found. NOTE
When the hyperterminal session is started the command “SETUP” needs to be
entered. Hitting the Enter will transmit the CR LF characters which are
required after the text “SETUP”. The text “SETUP” is not case sensitive so
any combination of upper and lower case letters will work.
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