Hi ,
I've also tried PySerial. The result is same. only able to open the port not
able to read.
I tried this code:
import serial
import io
import time
ser=serial.Serial('COM5',
baudrate=9600,
bytesize=8,
stopbits=1,
parity=serial.PARITY_NONE,
timeout=1)
print ("port Com5 opened")
print ("------------------------------------------------------------")
ser.isOpen()
while True:
#\r\n is for device terminators set to CR LF
ser.write(bytes(':FETCh?\r\n', encoding='ascii'))
data = ser.read(16)
print((data))
ser.close()
The output I got is like this: b' '
Don't know what it exactly means!
- ryan
________________________________
From: Steven Michalske <smichal...@gmail.com>
To: ranzam ali <ryanzam2...@yahoo.com>; "pyusb-users@lists.sourceforge.net"
<pyusb-users@lists.sourceforge.net>
Cc: "pyusb-users@lists.sourceforge.net" <pyusb-users@lists.sourceforge.net>
Sent: Thursday, October 3, 2013 12:40 AM
Subject: Re: [pyusb-users] accessing DMM
The damn uses a USB to serial UART converter. You can skip pyUSB and use
pySERIAL on /dev/ttyUSB0.
Steve.
On Oct 2, 2013, at 3:49 PM, ranzam ali <ryanzam2...@yahoo.com> wrote:
hello frens,
>
>
>I am having problem trying to read the data from my digital multimeter
>http://www.appatech.com/upload/download/file11349831248683.pdf. Actually, I am
>using PyUSB to access the DMM But, I am only able to open the port not able to
>read anything. The kernel version I am using is Linux version 3.6.11+.
>The output of dmesg gives me this
>[ 351.020927] cp210x 1-1.2:1.0: device disconnected
>[ 353.563977] usb 1-1.2: new full-speed USB device number 5 using dwc_otg
>[ 353.666404] usb 1-1.2: New USB device found, idVendor=10c4, idProduct=ea60
>[ 353.666432] usb 1-1.2: New USB device strings: Mfr=1, Product=2,
>SerialNumber=3
>[ 353.666448] usb 1-1.2: Product: CP2102 USB to UART Bridge Controller
>[ 353.666462] usb 1-1.2: Manufacturer: Silicon Labs
>[ 353.666474] usb 1-1.2: SerialNumber: 0001
>[ 353.668672] cp210x 1-1.2:1.0: cp210x converter detected
>[ 353.764017] usb 1-1.2: reset full-speed USB device number 5 using dwc_otg
>[ 353.865753] usb 1-1.2: cp210x converter now attached to ttyUSB0
>
>
>The PyUSB code i used was:
>import usb.backend
>import usb.core
>import usb.util
>
>
>dev=usb.core.find(idVendor=0x10c4, idProduct=0xea60)
>
>
>if dev is None:
> raise ValueError("Device not found")
>else:
> print ("Device found")
>dev.set_configuration()
>endpoint = dev[0][(0,0)][0]
>
>data = dev.read(0x81, 0x0040, 0,0)
>
>print(data)
>
>
>Can anyone help me?
>
>
>I have also attached the log of the SnoopyPro.
>
>
>Thanks,
>-ryan(newbie)
>
>
>“Do you love your creator? Love your fellow-beings first.”
>
>
>
<Capture-setup packet.PNG>
<Capture1.PNG>
<Capture2.PNG>
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