Difference between revisions of "TekPower TP4000ZC"

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== Protocol ==
== Protocol ==


The device periodically sends 14-byte packets at 2400 baud, 8n1.
See [[Fortune Semiconductor FS9721#Protocol]]
The MSB nibble of each byte indicates the byte number. The payload is composed of the LSB nibbles, and is a 1-1 mapping of the LCD segments. The downside to this protocol structure is that transmission errors in the LSB nibbles cannot be detected. There is no checksum or CRC in the packet.
 
=== Packet structure ===
 
{| border="0" width="50%" style="font-size: smaller" class="alternategrey sigroktable"
|-
! style="width: 3em;" | Byte
! style="width: 3em;" | Bits 7-4
! style="width: 3em;" | Bit 3
! style="width: 3em;" | Bit 2
! style="width: 3em;" | Bit 1
! style="width: 3em;" | Bit 0
 
|-
| 0
! colspan="1" | 0x1
| AC
| DC
| Auto
| RS232
 
|-
| 1
! colspan="1" | 0x2
| Negative
| 1A
| 1B
| 1C
 
|-
| 2
! colspan="1" | 0x3
| 1D
| 1E
| 1F
| 1G
 
|-
| 3
! colspan="1" | 0x4
| DP1
| 2A
| 2B
| 2C
 
|-
| 4
! colspan="1" | 0x5
| 2D
| 2E
| 2F
| 2G
 
|-
| 5
! colspan="1" | 0x6
| DP2
| 3A
| 3B
| 3C
 
|-
| 6
! colspan="1" | 0x7
| 3D
| 3E
| 3F
| 3G
 
|-
| 7
! colspan="1" | 0x8
| DP3
| 4A
| 4B
| 4C
 
|-
| 8
! colspan="1" | 0x9
| 4D
| 4E
| 4F
| 4G
 
|-
| 9
! colspan="1" | 0xa
| u
| n
| k
| Diode
 
|-
| 10
! colspan="1" | 0xb
| m
| %
| M
| Beep
 
|-
| 11
! colspan="1" | 0xc
| Farads
| Ohms
| Rel
| Hold
 
|-
| 12
! colspan="1" | 0xd
| A
| V
| Hz
| Low battery
 
|-
| 13
! colspan="1" | 0xe
| hFE
| Celsius
| Reserved
| Reserved
 
|}
 
=== Segment lettering ===
=== Segment lettering ===


Revision as of 07:07, 30 October 2012

TekPower TP4000ZC

The TekPower TP4000ZC is a 4000 counts, CAT II (600V) handheld digital multimeter with RS232 connectivity.

This multimeter appears to be a rebadged Digitek DT4000ZC.

Hardware

The RS-232 connector is a standard 3.5m stereo jack, with the ring left unconnected. The transmitter is optically insulated from the rest of the device. The DB-9 connector has a loopback resistor between the RX and TX pins.

Photos

  • Device, angle

  • Mugshot

  • Device, back

  • Package contents

  • Holster removed, front

  • Holster removed, back

  • Battery compartment

  • Rear cover

  • Front cover

  • Rear cover, PCB removed

  • PCB, front

  • PCB, back

  • Chip

  • HEF4013BT flip-flop

  • LM358 opamp

  • RS-232 optoisolation

  • RS-232 module

  • RS-232 PCB, bottom

  • RS-232 PCB, top

  • Supplied RS-232 cable

  • RS-232 cable, disassembled

  • RS-232 cable, detail

Protocol

See Fortune Semiconductor FS9721#Protocol

Segment lettering

  C  
   
B G
   
  F  
   
A E
   
  D  

Resources

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