This chapter describes the operation of the ZUP series via the serial communication port. details of the
initial set-up, operation via RS232 or RS485, the command set and the communication protocol are
described in this chapter.
The ZUP addresses can be set to any address between 1 and 31. Follow the procedure described
below to set the address.
1. Momentarily press the ADDR pushbutton on the front panel so the ADDR LED illuminates and the
VOLTS display shows ‘Addr’.
2. Rotate the front panel knob. While rotating the knob the AMPS display will show the selected
address. When the rotation is stopped, the address shown will be the selected address. The display
will return to show the actual voltage and current approx. 3 sec. from termination of rotating knob.
3. While the unit is in operation, depressing the ADDR pushbutton will cause the display to show the
selected address.
Toselect between RS232 or RS485 serial communication the following steps should be taken.
1. Press and hold REM pushbutton.(holding REM depressed for more than 1sec does not change the
local/remote status).
2. Press and hold REM pushbutton. After approx. 3sec. the display will continuously cycle between
‘rs232’ and ‘rs485’ approx. every 3sec.
3. Toselect RS232, release the REM pushbutton while ‘rs232 is displayed. Toselect RS485, release
the REM pushbutton while ‘rs485 is displayed.
4. Approx. 3sec after releasing the REM, the display returns to show the actual voltage and current.
Six optional rates are possible:300, 600, 1200, 2400, 4800, 9600. To select the desired rate, the
following steps should be taken. The power supply should be at Local operation mode during the
following procedure:
1. Press and hold ADDR pushbutton. After approx. 3 sec. the display will continuously cycle between
the six optional rates approx. every 2 seconds.
2. Toselect the desired rate, release ADDR while that rate is displayed.
3. After releasing ADDR the display will return to show the actual voltage and current.
To enable the operation via RS232 or RS485, the power supply should be at Remote mode. At this
mode, all the front panel functions are disabled except Local/Remote pushbutton.
Transition from Local to Remote control:
1. Via the front panel: Momentarily press REM pushbutton so the REM LED illuminates. Toreturn from
Remote to Local control, momentarily press REM pushbutton so the REM LED extinguishes.
2. Via the serial communication port (RS232/RS485): By sending a :RMTn; command to the power
supply. Refer to par. 5.5.2.
CHAPTER 5 RS232 & RS485 REMOTE CONTROL
5.1 INTRODUCTION
5.2 CONFIGURATION
5.2.1 Address setting
5.2.2 RS232 or RS485 selection
5.2.3 Baud rate setting
5.2.4 Local/Remote selection
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