MASTECH MAS345

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The MASTECH MAS345 is a 3999 counts, CAT II handheld digital multimeter with RS232 connectivity.

It is also sold under the names Velleman DVM345DI, McVoice M-345pro, and Sinometer MAS345.

See MASTECH MAS345/Info for more details about the device.

Hardware

Multimeter:

Main chip: MASTECH Japan M343-01 F0951D174 (80 pins, 16 + 16 + 24 + 24)
?: ST 74HC4060 N00U732
?: Texas Instruments 12AL9JM 0P07CP
?: GC7555AP AA7057HS
?: Sharp B B5 PC817
?: Sharp B B6 PC817
Crystal: ca. 32kHz
Fuse: 15A/250V (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack)

RS232 cable:

TODO.

Photos

TODO.

Protocol

TODO.

Resources

TODO.

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