Tenma 72-2540 low voltage power supply remote control

Lab setup during Covid-19 teleworking (TL;DR)

The power supply powers the whole caribou setup. It is connected to PCLCD51 where it can be accessed through /dev/ttyACM0. Two shell scripts can be found in caribou home directory (/home/caribou/): pwrSupplyOn.sh and pwrSupplyOff.sh.

pwrSupplyOn.sh first switches the supply output off, then sets it to 12 V, 1.5 A and enables OCP (Over Current Protection). As a last step it switches the output on. You can use this script to power-on or power-cycle the board.

pwrSupplyOff.sh switches the supply output off. Use it to power the setup off.

Both scripts call python scripts located in /home/caribou/tenma-serial/.

General description

The device can be controlled over a serial interface. One can connect either over an RS-232C or USB port. The USB port has a built-in USB-to-serial converter, that presents itself as an ACM device on the USB side. So it typycally maps to /dev/ttyACM0 on a linux machine. You can talk to it using any serial terminal software or also by redirecting the keyboard input to the corresponding device (e.g. /dev/ttyACM0). The serial port settings and list of commands is further down on this page.

The other way is to use scripts that translate a bit more user friendly interface to the serial commands. For example: https://github.com/kxtells/tenma-serial

Serial port settings

  • Baud rate: 9600
  • Parity bit: None
  • Data bit: 8
  • Stop bit: 1
  • Data flow control: None

Serial port command format

  • COMMAND<X>:<NR2>
  • COMMAND<Boolean>

  • <X> Output channel (always 1 in case of a single channel supply 72-2540)
  • <NR1> Digits with an implied decimal point assumed at the right of the least-significant digit. Example: 273 (Integer number)
  • <NR2> Digits with an explicit decimal point. Examples: .273, 0.273
  • <Boolean>: Boolean value 1 or 0.

List of serial port commands


  • Description: Sets the output current
  • Response time: 50ms
  • Example: ISET1:2.225 sets the CH1 output current to 2.225A


  • Description: Returns the output current setting
  • Example: ISET1? returns the CH1 output current setting.


  • Description: Sets the output voltage.
  • Example: VSET1:20.50 sets the CH1 voltage to 20.50V.


  • Description: Returns the output voltage setting.
  • Example: VSET1? returns the CH1 voltage setting.


  • Description: Returns the actual output current.
  • Example: IOUT1? returns the CH1 output current.


  • Description: Returns the actual output voltage.
  • Example: VOUT1? returns the CH1 output voltage.


  • Description: Turns on or off the beep.
  • <Boolean>: 0=OFF, 1=ON.
  • Example: BEEP1 turns on the beep.


  • Description: Turns on or off the output.
  • <Boolean>: 0=OFF, 1=ON.
  • Example: OUT1 turns on the output.


  • Description: Returns the POWER SUPPLY status.
  • Contents 8 bits in the following format:
    • bit 0: CH1 mode: 0=CC, 1=CV
    • bit 1: N/A
    • bit 2: N/A
    • bit 3: N/A
    • bit 4: Beep: 0=Off, 1=On
    • bit 5: Lock: 0=Lock, 1=Unlock
    • bit 6: Output: 0=Off, 1=On
    • bit 7: N/A


  • Description: Returns the device identification.
  • Example: *IDN? returns manufacturer, model name, serial number: TENMA 72-2540 SN:xxxxxxxx Vx.xx


  • Description: Recalls a panel setting.
  • <NR1>: Memory number 1 to 5.
  • Example: RCL1 recalls the panel setting stored in memory number 1.


  • Description: Stores the panel setting.
  • <NR1>: Memory number 1 to 5.
  • Example: SAV1 stores the panel setting in memory number 1.


  • Description: Over current protection.
  • <Boolean>: 0=OFF, 1=ON.
  • Example: OCP1 turns on the OCP


  • Description: Over voltage protection.
  • <Boolean>: 0=OFF, 1=ON.
  • Example: OVP1 turns on the OVP
Edit | Attach | Watch | Print version | History: r4 < r3 < r2 < r1 | Backlinks | Raw View | WYSIWYG | More topic actions
Topic revision: r4 - 2021-08-12 - DominikDannheim
    • Cern Search Icon Cern Search
    • TWiki Search Icon TWiki Search
    • Google Search Icon Google Search

    CLIC All webs login

This site is powered by the TWiki collaboration platform Powered by PerlCopyright & 2008-2023 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback