Experimental Physics and
Industrial Control System

[email protected] (Marty Kraimer) · Tue, 13 Feb 1996 12:53:35 -0600

The Allen Bradley Driver (abDrv) in EPICS 3.12.2 and earlier may
fail doing btReads and btWrites with new versions of the 6008-SV2R
scanner. This does NOT impact ordinary bi, bi, ai, ao support.
It will only cause a problem if you have written special support
that issues btRead or btWrite commands to abDrv. I found
the problem when I started using the new scanner with special DCM
support I wrote.

Below is a complete list of changes that will be available in the new
version of abDrv. If anyone needs the new version imediately contact me.
The one-line documentation has already been changed.

Marty Kraimer

Allen Bradley Driver
	Analog Output Block Transfers were being requested too frequently

	If link_status command fails (3 times in succession) adapters
	are now immediatly declared down.

	For btRead and btWrite, The driver now enforces a timeout of 5 seconds
	which is 1 second more than scanner itself enforces. This is so that
	if scanner throws away a BT request it will still timeout.

	For btRead and btWrite is is no longer permissible to issue a
	new btRead or btWrite from tha callback routine.

	The on line doc has the following two changes:

	abConfigBaud has arguments (link,number) (Old doc was wrong)
	Now states that new btRead/btWrite can NOT be ussued from callback.

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System