Experimental Physics and
Industrial Control System

Jens Eden <[email protected]> · Wed, 15 Sep 1999 23:34:36 +0200

Hi,

we experienced a strange behaviour of an OMS58 Motor-card.
If the OMS58-card is jumpered for base address 0xc000, the motor
suddenly stops, starts again and it needs several retries to reach its
destination. 
We tried various cards in different crates and this only happens if the
card has base address 0xc000, even if there are no other cards in the
crate.
Anyone an idea, what this could be?

Another question concerns the maximum message size of CA-messages.
We use Mark Rivers MCA-Record with the Canberra AIM556 MCA, which is
based on the Waveform-Record. If I try to read more than 4090 channels
(~16360 bytes), we get the CA-error "data does not fit in a CA-message".
In caProto.h MAX_MSG_SIZE is defined with 16384 (16*MAX_UDP).
Is it safe to define MAX_MSG_SIZE at least to 33*1024, (for CA-Server
and Client)
or is there another way to do it?

Thanks in adv.

Jens

Jens Eden
PTB

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System