Difference between revisions of "MASTECH MAS345"
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It is also sold under the names Velleman DVM345DI, McVoice M-345pro, and Sinometer MAS345. | It is also sold under the names Velleman DVM345DI, McVoice M-345pro, and Sinometer MAS345. | ||
Manual: [http://web.archive.org/web/20080305031323/http://www.p-mastech.com/products/04_dm/mas345_hys004695.pdf Original version] (2008), [http://www.elv-downloads.de/service/manuals_hw/45988_MAS345_UM.pdf German version from ELV] (2002) | |||
Software: [http://www.elv-downloads.de/service/manuals_hw/45988_MAS345_Software_V20.zip "DMM VIEW" version 2.0] (from ELV; for Win98/NT/ME/2000/XP; supports MAS343, MAS344, MAS345, M9803R) | |||
See [[MASTECH MAS345/Info]] for more details about the device. | See [[MASTECH MAS345/Info]] for more details about the device. | ||
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* '''?''': Sharp B B6 PC817 | * '''?''': Sharp B B6 PC817 | ||
* '''Crystal''': ca. 32kHz | * '''Crystal''': ca. 32kHz | ||
* '''Fuse''': 15A/250V (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack) | * '''Fuse''': 15A/250V (6x30mm) (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack) | ||
'''RS232 cable''': | '''RS232 cable''': | ||
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== Protocol == | == Protocol == | ||
The protocol is documented in the vendor software's "Help" window (seems to apply to MAS343, MAS344, and MAS345; the M9803R protocol is different). | |||
* Serial port settings: '''600''' baud, '''7n2''' | |||
* Every time the host sends any character to the DMM, it returns '''14 ASCII bytes''' containing the measurement value and so on. The documentation states that a request interval of >= 1 second is "required for stable measuring data from meter". | |||
{| border="0" style="font-size: smaller" class="alternategrey sortable sigroktable" | |||
|- | |||
!Byte(s) | |||
!Description | |||
|- | |||
| 1-2 | |||
| Measuring mode: DC, AC, OH, CA, TE, ... | |||
|- | |||
| 4 | |||
| Sign | |||
|- | |||
| 5-9 | |||
| Decimal point and current measurement value. Examples: "10.00", "0L", "3.999". | |||
|- | |||
| 10-13 | |||
| Unit. Examples: mV, A, KOHM, nF, ... | |||
|- | |||
| 14 | |||
| Carriage return | |||
|} | |||
== Resources == | == Resources == | ||
TODO. | TODO. | ||
Revision as of 23:36, 6 July 2012
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.
Manual: Original version (2008), German version from ELV (2002)
Software: "DMM VIEW" version 2.0 (from ELV; for Win98/NT/ME/2000/XP; supports MAS343, MAS344, MAS345, M9803R)
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 (6x30mm) (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack)
RS232 cable:
- TODO.
Photos
TODO.
Protocol
The protocol is documented in the vendor software's "Help" window (seems to apply to MAS343, MAS344, and MAS345; the M9803R protocol is different).
- Serial port settings: 600 baud, 7n2
- Every time the host sends any character to the DMM, it returns 14 ASCII bytes containing the measurement value and so on. The documentation states that a request interval of >= 1 second is "required for stable measuring data from meter".
| Byte(s) | Description |
|---|---|
| 1-2 | Measuring mode: DC, AC, OH, CA, TE, ... |
| 4 | Sign |
| 5-9 | Decimal point and current measurement value. Examples: "10.00", "0L", "3.999". |
| 10-13 | Unit. Examples: mV, A, KOHM, nF, ... |
| 14 | Carriage return |
Resources
TODO.