Experimental Physics and
Industrial Control System

"J. Lewis Muir" <[email protected]> · Thu, 15 Dec 2005 11:00:45 -0500

On Thu, Dec 15, 2005 at 09:08:19AM -0600, Chithra Karunakaran wrote:
> Hi:
>  
> Has anyone worked with Oxford Danfysik Beam Position monitoring system
> (4 channel IC plus Electronics Unit, YMCS0012).  The device does not
> respond to any of the commands send through the serial port.
>  
> Thanks,
> Chithra.

Hi. I have.

I am able to communicate with it with the following RS-232 settings:

Baud rate: 19200
Data format: 8 bits 
Stop bits: 1 
Parity: none 
Flow control: none 

Also, if you have only one device (i.e. you are not chaining the
devices), your RS-232 cable must be wired correctly. The wiring should
be as follows:

VME  <->  QBPM
---       ----
2         3
3         2
5         5
4-6-8

On the end that connects to the VME IOC, pins 4, 6, and 8 should be tied
together.

If you have more than one device, the wiring needs to be different (see
section 6.6 on page 13 of the manual).

A command you can send is ":READ1:CURRALL?" terminated with "\n" (ASCII
10 / linefeed) to read all four current channels at once. Replace the 1
after "READ" with the unit address assigned to your device. Or if you
don't know it, try 0-15 if 1 doesn't work.

Hope this helps.

-lewis

-- 
J. Lewis Muir
Software Engineer
CARS/IMCA-CAT

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System