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Reverse engineering: Wintex TD2200


      work in progress
Functional blocks, adjustable elements association
Images

work in progress

The Wintex TD2200 is a digital handheld multimeter of Korean provenience. It seems to have a decent accuracy (0.1% on DC voltage). It also contains a RS232 port for communication with the computer. The package I got also contained a RS232/USB converter with the CP210x chip (driver here). The multimeter has a miniUSB connector (pinout to be determined) for RS232; the interface cable has a miniUSB on one end and a Canon 9F (standard RS232) on the other end. The interface is optoisolated.

The meter is built around the Cyrustek ES51922 (local copy) chip.

The software coming with the device is fairly lousy and Windows-only. However it does the basic data collection job.

On hardware level, the communication protocol is 7bit, 19200 baud, no parity, no handshake.

On software level, the meter sends a line of 12 ASCII characters per measurement (typ. several per second), example (mV, small fluctuating voltage) here:

401344;40080{0D}{0A}
401322;40080{0D}{0A}
401256;40080{0D}{0A}
400061;00080{0D}{0A}
401480;40080{0D}{0A}
402299;00080{0D}{0A}
406057;00080{0D}{0A}
400341;40080{0D}{0A}
400419;40080{0D}{0A}
400466;40080{0D}{0A}
400514;40080{0D}{0A}
400553;40080{0D}{0A}
400498;40080{0D}{0A}
401566;40080{0D}{0A}
400322;40080{0D}{0A}

The RS232 nature of the device seems to allow its connection to other electronics as a data acquisition unit. A wireless bridge, e.g. mediated via wifi, can be also used to connect it to the data collection server. A Bluetooth/UART converter could be used for connecting it to a cellphone.

The meter can measure temperatures using a K-type thermocouple. The value can be adjusted with a small SMD trimpot (VR4), located on the board between the Power and Light buttons.

The TD2200 contains the following chips:


Functional blocks, adjustable elements association

The multimeter is internally quite similar to Uni-Trend UT61E, with additional circuitry for measurement of coils and for thermocouple handling.


Images


Without cover

Display removed

Main chip

Main chip

Optoisolated serial output

Back side

Back side, under display

Cover inside

Cover outside

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