Section 7
Parameter Settings
71
FT742-SM (RS422 & RS485) Sensors
– User Manual
7.4.28 US: Set or Query Saved Parameters
Command
Parameter
US
Command
Syntax
SET Sensor:
$<listenerID>,US<setting>*<checksum><cr><lf>
$aa,USS*hh<cr><lf>
QUERY Sensor:
$<listenerID>,US?*<checksum><cr><lf>
$aa,US?*hh<cr><lf>
Sensor output:
$<talkerID>,US=<match>*<checksum><cr><lf>
$aa,US=c*hh<cr><lf>
Parameters
<setting>
S
Copies the User Parameters and saves them as the Saved
Parameters.
<match>
P
indicates the User Parameters are the same as the Saved
Parameters
F
indicates the User Parameters are not the same as the Saved
Parameters
Examples
Example 1
Set and Verify new user saved parameters
Message
Comment
$01,USS*//<cr><lf>
Set saved parameters
$01,US?*//<cr><lf>
Query the saved parameters
$WI,US=F*4F<cr><lf>
Sensor response
Description
There are three copies of Parameters stored in Flash memory namely, User Parameters,
Factory Parameters, Saved Parameters respectively. All three copies are initially loaded
with the same default settings.
Figure 29: Relationship between the 3 flash copies of Parameter Settings
The User Parameters is the copy that the sensor operates from, at all times. When sending
a command to the sensor, it is the User Parameter copy which is updated. The user
parameters copy is non volatile so the sensor will keep the last settings when it is powered
up again.
The Factory Parameters retain the original default settings and cannot be modified, but can
be used to replace the User Parameter, by using the RSF command (see Section 7.4.20)
Continued over the page…
