Difference between revisions of "MASTECH MAS345"
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[[File:Mastech mas345 device front.jpg|thumb|right|MASTECH MAS345]] | [[File:Mastech mas345 device front.jpg|thumb|right|MASTECH MAS345]] | ||
The [http://web.archive.org/web/20080305031323/http://www.p-mastech.com/products/04_dm/mas345.html MASTECH MAS345] is a | The [http://web.archive.org/web/20080305031323/http://www.p-mastech.com/products/04_dm/mas345.html MASTECH MAS345] is a 4000 counts, CAT II handheld digital multimeter with RS232 connectivity. | ||
It is also sold under the names [http://web.archive.org/web/20070224223043/http://www.globalspecialties.com/pro70.html Global Specialties Pro-70 | It is also sold under the names [http://www.circuitspecialists.com/csi345.html Circuit Specialists CSI345]<sup>1</sup>, [http://web.archive.org/web/20070224223043/http://www.globalspecialties.com/pro70.html Global Specialties Pro-70], [http://www.xlsmess.de/html/mcvoice_-_m-345pro.html McVoice M-345pro], [http://www.sinometer.com/jpg/MAS345.jpg Sinometer MAS345]. and [http://www.velleman.eu/products/view/?country=ot&lang=de&id=341708 Velleman DVM345DI]. | ||
<small> | |||
<sup>1</sup> The [http://www.circuitspecialists.com/products/csi345.zip software shipped by Circuit Specialists] is MasView 1.1. | |||
</small> | |||
== Hardware == | == Hardware == | ||
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* '''Main chip''': MASTECH Japan M343-01 F0951D174 (80 pins, 16 + 16 + 24 + 24) | * '''Main chip''': MASTECH Japan M343-01 F0951D174 (80 pins, 16 + 16 + 24 + 24) | ||
* '''14-stage binary counter/oscillator''': [http:// | * '''14-stage binary counter/oscillator''': [http://www.st.com/internet/analog/product/69763.jsp ST 74HC4060] ([http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00000318.pdf datasheet]) (marking: "ST 74HC4060 N00U732") | ||
* '''Precision | * '''Precision perational amplifier''': [http://www.ti.com/product/op07c Texas Instruments OP07C] ([http://www.ti.com/lit/gpn/op07c datasheet]) (marking: "12AL9JM 0P07CP") | ||
* ''' | * '''CMOS multifunctional time base circuit''': [http://translate.google.com/translate?sl=zh-CN&tl=en&js=n&prev=_t&hl=de&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fproduct.ch.gongchang.com%2Fd16189061.html&act=url Green Sea Technology GC7555AP] ([http://www.chinaeds.com/zl/201041695739344804_GC7555AD,GC7555APpdf.pdf datasheet], [https://translate.googleusercontent.com/translate_c?act=url&hl=de&ie=UTF8&prev=_t&rurl=translate.google.com&sl=zh-CN&tl=en&u=http://www.chinaeds.com/d.aspx%3Fid%3D298797&usg=ALkJrhh8MzVMH7GdvsM85Mvt0pR1rHF_-w English translation]) (marking: "GC7555AP AA7057HS") | ||
* ''' | ** This is an NE555 compatible chip, apparently. | ||
* ''' | * '''General-purpose photocoupler''': [http://www.sharpsma.com/optoelectronics/isolation-devices/dc-input-photocouplers/PC817X2J000F Sharp PC817] ([http://www.sharpsma.com/webfm_send/1092 datasheet]) (marking: "B > B5 PC817 Sharp") | ||
** "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B5": date code == May 1991 | |||
* '''General-purpose photocoupler''': [http://www.sharpsma.com/optoelectronics/isolation-devices/dc-input-photocouplers/PC817X2J000F Sharp PC817] ([http://www.sharpsma.com/webfm_send/1092 datasheet]) (marking: "B > B6 PC817 Sharp") | |||
** "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B6": date code == June 1991 | |||
* '''Crystal''': ca. 32kHz | * '''Crystal''': ca. 32kHz | ||
* '''Fuse''': 15A/250V (6x30mm) (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) | ||
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'''RS232 cable''': | '''RS232 cable''': | ||
* | * See [[Multimeter_cables#MASTECH_MAS34X_cable]]. | ||
== Photos == | == Photos == | ||
Revision as of 16:18, 22 July 2012
The MASTECH MAS345 is a 4000 counts, CAT II handheld digital multimeter with RS232 connectivity.
It is also sold under the names Circuit Specialists CSI3451, Global Specialties Pro-70, McVoice M-345pro, Sinometer MAS345. and Velleman DVM345DI.
1 The software shipped by Circuit Specialists is MasView 1.1.
Hardware
Multimeter:
- Main chip: MASTECH Japan M343-01 F0951D174 (80 pins, 16 + 16 + 24 + 24)
- 14-stage binary counter/oscillator: ST 74HC4060 (datasheet) (marking: "ST 74HC4060 N00U732")
- Precision perational amplifier: Texas Instruments OP07C (datasheet) (marking: "12AL9JM 0P07CP")
- CMOS multifunctional time base circuit: Green Sea Technology GC7555AP (datasheet, English translation) (marking: "GC7555AP AA7057HS")
- This is an NE555 compatible chip, apparently.
- General-purpose photocoupler: Sharp PC817 (datasheet) (marking: "B > B5 PC817 Sharp")
- "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B5": date code == May 1991
- General-purpose photocoupler: Sharp PC817 (datasheet) (marking: "B > B6 PC817 Sharp")
- "B": model = PC817X2J000F/PC817XF2J00F, ">": China factory, "B6": date code == June 1991
- Crystal: ca. 32kHz
- Fuse: 15A/250V (6x30mm) (for the 10A jack; interestingly the PCB silkscreen says "20A" for that jack)
RS232 cable:
Photos
Multimeter:
RS232 cable:
See Multimeter_cables#MASTECH_MAS34X_cable.
Protocol
The protocol is (partially) 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, RTS low, DTR high
- Every time the host sends a (any?) character to the DMM (the vendor software sends D/0x44), 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".
Packet format:
| Byte(s) | Description |
|---|---|
| 1-2 | Measuring mode (DC, AC, OH, CA, TE, DI, ...) |
| 3 | Always a space (?) |
| 4 | Sign ('-' or ' ', i.e. a minus or a space) |
| 5-9 | Decimal point and current measurement value (Examples: 10.00, 0L, 3.999) |
| 10-13 | Unit (Examples: V, mV, A, mA, kOhm, MOhm, nF, ...) |
| 14 | Carriage return (13/0x0d) |
Example packets:
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| D | C | - | 0 | 0 | 0 | . | 0 | V | \r | ||||
| A | C | 0 | 0 | . | 0 | 0 | A | \r | |||||
| C | A | 0 | . | 0 | 7 | 1 | n | F | \r | ||||
| O | H | O | . | L | M | O | h | m | \r |
Resources
- Original English vendor manual (2008)
- elv.de: Download zu: Digital-Multimeter MAS-345 (68-04 59 88):
- German manual from ELV (2002)
- "DMM VIEW" software, version 2.0 (for Win98/NT/ME/2000/XP; supports MAS343, MAS344, MAS345, M9803R)
- cczwei-forum.de: C# software for reading DMM values
- Linux Magazin: E-Werke: Perl misst Stromverbrauch mit Multimeter
- mas-345/marsh: multimeter read and store
- digitaltrip.hu: Mastech MAS-345 digital multimeter Windows GUI (github)
- github: device-mas345-perl
- b-redemann.de Auslesen von Messgeräten mit RS232 Interface über USB
- tmon (uses a MASTECH MAS345)