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I would be interested if anyone has more information. Except for the 'D' command for reading the currently measured value I have not been able to find a description of the protocol. With the pull-down resistor communication is working and I can read the measured values on my PC.Īccording to the schematic the RS-232 port is only connected to the multimeter part of the device. The levels used are far from standard-compliant, but the USB-to-UART converter accepts it. In my case adding a resistor of 10k between the negative output of the charge-pump of the level shifter of the USB-to_UART converter, and the RxD pin fixed this. I am using a USB-to-UART converter which did not include a pull-down on RxD to pull the input to idle level when nothing was connected. This might have worked on old-fashion implementations of a serial port, but in my case it did not. The implementation of TxD only uses a pull-down between signal ground and the TxD pin using the transistor of the opto-coupler and a 3.3k resistor. The schematic of a MS-9150 shows that only TxD and RxD are connected, and that opto-couplers are used for isolation. This is caused by the implementation of the TxD 'transceiver' of the MS-9150. Both RxD and TxD lights were showing activity, the TxD light however was only very faint. Using this adapter the connection seemed correct, but I did not see a response on my screen yet. Finally a DB25F-DB9M converter and a DB9F-DB9F gender changer made the proper connections for TxD and RxD (These came from my stock, I guess a DB25F to DB9F should work as well). To get the device connected to my PC a breakout box with lights to check the connections turned out to be very useful. (Commands are executed after sending a linefeed ' ' character) The port on this device is RS-232, using following settings: In the end I got it working so I thought I would share my findings. The posts here got me started on the RS-232 connection of the device. This appears to be the same device as a Metex MS-9150. Some time ago I became the owner of a Tenma 72-5085.

Metex ms 9150 manually