[time-nuts] Prologix, 1 more quick ?

[Chuck Harris]

Here is a snippet of code that is a work in progress, but should help
you get your prologix working:
---------------------------------
#! /usr/bin/env python

# 7854.py - try out some gpib data collection using the Prologix gpib-usb controller
#

import os
import termios
import serial
import time

def gpib_init() :
	ser.write("++mode 1\r")
	time.sleep(0.1)
	ser.write("++ifc\r")
	time.sleep(0.1)
	ser.write("++auto 0\r")
	time.sleep(0.1)
	ser.write("++eoi 0\r")
	time.sleep(0.1)
	
def gpib_read(addr):
	ser.write("++addr " + str(addr) + "\r")
	time.sleep(0.1)
	ser.write("++read eoi\r")
	return ser.readline()

def gpib_write(addr,gpibstr):
	ser.write("++addr " + str(addr) + "\r")
	time.sleep(0.1)
	ser.write(gpibstr + "\r")
	
#
# test program...
#

ser = serial.Serial('/dev/ttyUSB0',rtscts=0,timeout=1)

ser.write("++ver\r")
print ser.readline()

gpib_init()

gpib_write(10,"ID?\r")
print "ID= " + gpib_read(10) + "\r"

gpib_write(10,"VMDR\r")
gpib_write(10,"HMDB\r")

gpib_write(10,"STORED\r")

gpib_write(10,"1 0 2 4 >P/W AVG10\r")
gpib_read(10)

gpib_write(10,"SENDX\r")
time.sleep(4)

print "X=" + gpib_read(10) + "\r"
print "X=" + gpib_read(10) + "\r"

---------------------------------

-Chuck Harris

Patrick wrote:
> So sorry guys. I have been pulling my hair out for the last hour. One 
> more question please.
> 
> Abdul sent me over a PySerial script just before I bought this item.
> 
> In the script there was line line like this:
> ser.write("plot;\r\n")
> 
> I have tried ser.write("++ver;\r\n') and many other commands and 
> carriage returns.
> 
> With ser.read(100) I get
> 'Unrecognized command\r\n'
> 
> So at least I have some communication. Could someone help me with the 
> syntax?
> 
> Thanks in advance-Patrick
> 
> Patrick wrote:
>> Thanks to Chuck, Jeff, Christian and John!
>>
>> I was trying to do a quick test with a live CD in bash but the general 
>> message I have gotten is to fix the Ubuntu install. Indeed you were 
>> right and I was wrong.
>>
>> I tried this command (thanks Jeff)
>>
>> sudo tail -f /var/log/messages
>>
>> I found out that I had a conflict with brltty. I don't remember 
>> installing a brail terminal!
>>
>> It's funny it only had a conflict with the prologix device and not a 
>> usb-serial adapter.
>>
>> Anyhow I am trying to communicate with the device with PySerial now. I 
>> am getting error messages back when I read but at least that's something.
>>
>> Thanks again to all.
>>
>> -Patrick