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The Brymen BM25x series supports the BC-20X that is an opto-isolated serial cable. The link seems to be unidirectional i.e. when activated the DMM periodically sends updates to the host while the host cannot control the DMM in any way. The protocol is documented in "6000-count-digital-multimeters-r1.pdf" that is available from the manufacturer. Every 15 byte packet consists of a bitmap where the bits correspond to segments or symbols on the LCD display i.e. the DMM essentially sends the contents of its screen to the host in every update. This driver then decodes the measured quantity, unit and its value from the bitmap. |
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| .. | ||
| bm25x.c | ||
| es519xx.c | ||
| fs9721.c | ||
| fs9922.c | ||
| m2110.c | ||
| metex14.c | ||
| rs9lcd.c | ||