4.4 RS232/485 commands
For the RS485 version, all commands are preceded by the device address. If the address matches, a
carriage return is sent.
Command Description Response
@ Read Unit ID Model number, Firmware version and serial number.
Eg. SY035,V3.0, 1234cr
*H Programme heading A heading of up to 46 characters can be programmed to appear on the printout
Follow the *H command by the required message, terminated by carriage return if
less than 46 characters. The header is then reported back for confirmation.
*R Read display Reads whatever is displayed.
*TC Calibrate clock The built in clock can be speeded up or slowed down to improve accuracy. The
range of values is +/- 31. Each positive step increases the clock speed by
4.068ppm, each negative step reduces it by 2.034ppm. *TCF will put the clock
into frequency test mode and report the current calibration value. To enter a
new value send *TC+nn or *TC-nn where nn is a 2 digit number in the range
+/-31
*TR Read time Reports the current time & date in the form:YY/MM/DD hh:mm:ss(cr)
*TS Set time Set the clock to a new time and date. Enter in the form: *TSYYMMDDhhmmss
*U Programme units A label of up to 8 characters can be programmed to appear on the printout
following the displayed value. Follow the *U command by the required label,
terminated by carriage return if less than 8 characters. The label is then reported
back for confirmation.
5 Analogue output option
The analogue output, voltage or current, is proportional
to the indicated value. Fsout refers to the indicated value which results in a full scale
analogue value. eg. If the analogue output is 0-10V and the full scale value is set to 50.00, readings
of 50 or higher would give an output of 10V. Readings of 0 or less would give 0V out (Actual minimum
voltage out is typically 0.02V). To view the current full scale value press the 4 key. To change it press
the 4 key again. Use the 5 6 & 4 keys to set the value then press PROG. For current output see
5.1, for voltage 5.2
5.1 4-20mA calibration
A 4mA output signal is generated. If necessary adjust the ZERO trimmer. Press 5or6
tto move on or PROG to return to step 5.
5.11
A 20mA output is generated. If necessary adjust the SPAN trimmer. Press 5or6 t to
repeat step 5.1 or PROG to return to step 5.
5.2 Voltage calibration
A 0V output is generated. No zero trim is required with the voltage out option. Check that
it is 0.025V or less. Press 5or6 t to move on or PROG to return to step 5.
5.21
A full scale output voltage is generated. This can be adjusted using the SPAN trimmer to
5V, 10V or any value between as required. Press 5or6 t to repeat step 5.1 or PROG
to return to step 5.
FSout
AdJ 4
AdJ20
SPAn
AdJ
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