Difference between revisions of "EXTECH 407760"

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{{Infobox sound level meter
| image              = [[File:Extech_407760.jpg|180px]]
| name                = EXTECH 407760
| status              = planned
| source_code_dir    = tondaj-sl814
| connectivity        = tbd
| frequency_range    = tbd
| measurement_range  = tbd
| resolution          = tbd
| accuracy            = tbd
| frequency_weighting = tbd
| time_weighting      = tbd
| website            = [http://www.extech.com/instruments/product.asp?catid=18&prodid=551 extech407760.cn]
}}


The EXTECH 407760 is a sound level meter with USB connectivity.
See [[EXTECH 407760/Info]] for more details (such as '''lsusb -vvv''' output) about the device.
See [[EXTECH 407760/Beagle_dump]] for more details on protocol
== Hardware ==
'''Device''':
* '''Main CPU''': TBD
* TBD
* TBD
* TBD
* TBD
* '''Battery''': 3.6v 1/2 AA battery
<pre>
it's hard to read the chip numbers
There's two chips on this side of the board. Same markings on both
They have the TI logo
TI 062C
15K
CV8J
</pre>
'''USB cable''':
* TBD
== Photos ==
'''Device''':
<gallery>
File:Extech_407760.jpg
File:CAM00118.jpg
File:CAM00119.jpg
</gallery>
'''USB cable''':
TBD
== Protocol ==
The device has a usb connector. 
The device accepts bulk transfer commands on a usb bus.
=== Commands / replies ===
<pre>
407760(EXTECH) Communication Protocol
Basic setup (64 byte in all, latter is 0)
0        1        2        3          4          5    6    7      8    9    10    11
LED STATUS Samprate Alarm HI Alarm Low y m d H M S Samp points
10
20
30
0
U8 U8 U8 U8 U8 U8 U8 U8 U8 U8 3U8
STATUS:
7 6 5 4 3
2
  1        0
Auto：0
Manual：1 RT  1
STOR 0 1dBA
0dBC 1fast
0slow S:01 
M:10
H:11
Samprate 
  0x01 represent  50ms
  0x02          500ms
  0x03          1s
  0x04          2s
  0x05          5s
  0x06          10s
  0x07          60s
Download the data
PC transmits the read-command 00,00,0D in read Mode.
If the first byte of reply is 0XFF , then it is STOR MODE
{STOR MODE
2
HI   1
M 0
LOW
Transmit the read-command 00,00,0f READ data
READ INFO
11 10 9 8 7 6 5 4 3
2
  1
0
Alam
H
Alam
L
fs
unit
S
M
H
d m m
y Samprate
BLOCKBUF  512
Except the last time, It is sent BLOCKBUF real data
2
hi   1
lo 0
0x0f
Hi*256+lo is the times of reading data
                      //STOR MODE
}
If it not 0XFF, then it is REAL MODE
STATUS
7 6 5 4 3
2      1        0
 
Auto：0
Manual：1 RT/STOR check
1dBA
0dBC 11fast
0slow Samprate
SAMPRATE =0 this means EMS memory is empty
“serial parameters”
To connect to the device via USB, you will need to know the following for development..
VID : VID_10C4
PID : PID_0003
Baud rate : (9600)
Bit value : 8
</pre>
=== Notes ===
TBD
== Python script ==
Here's a quick Python script for getting the values out of the EXTECH 407760. A sigrok driver will follow soon.
<small>
#!/bin/python
import usb.core
import sys
dev = usb.core.find(idVendor=0x10c4, idProduct=0xea61)
#dev.baudrate=9600
dev.set_configuration()
dev.reset()
bytes_written = dev.write(0x02, [0x00,0x00,0x0D], 0)
print "_dbg bytes_written: ", bytes_written
for x in xrange(0,100):
  print "_dbg attempting read for the %d time\n" % x
  try:
    data = dev.read(0x82, 1,0,1000)
    if data:
      print "Data found!\n"
      sys.exit()
    else:
      print "Data not found!\n"
  except:
    pass
</small>
'''Example output:'''
<small>
TBD
</small>
== Resources ==
TODO.
[[Category:Device]]
[[Category:Sound level meter]]
[[Category:Planned]]

Latest revision as of 02:33, 5 May 2013

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