Posted by Glen Marshall, 18 June 2002
http://midtwist.triumf.ca:8081/EL/020618.16014?exp=twist
(This information is also in ODB.)

TWIST CAMAC Scaler list

There are currently 3 6-channel CAMAC scalers in the TWIST crate,
which are read out. This allows 18 channels (numbered 0 to 17),
to be connected as follows. The connections have been made from the NIM
electronics to  the patch panel, and will function as soon as this patch
panel is connected to the patch paned underneath the CAMAC crate.

A logic diagram of the NIM trigger electronics will be posted soon.


Channel		Signal		Function

0		T1ION		1AT1 ion chamber, BL1A current monitor
1		M12		discriminator (35 mV) on analog OR of
				tubes M1 and M2 of thin muon
				scintillator
2		M1D		discriminator (35 mV) on tube M1
3		M2D		discriminator (35 mV) on tube M2
4		M1LD		discriminator (15 mV) on tube M1 (for e+)
5		M2LD		discriminator (15 mV) on tube M2 (for e+)

6		PU		positron upstream, coincidence of
				PU1 and PU2
7		POSMU		PU within 4 microseconds of trigger
8		PU1		discriminator (50 mV) on analog
				OR of tubes PU11 and PU12 on
				positron scintillator nearest to
				stopping target
9		PU2		discriminator (50 mV) on analog
				OR of tubes PU21 and PU22 on
				positron scintillator farthest from
				stopping target
10				N/C
11		DS		coincidence of downstream
				pion/positron scintillators

12		M		coincidence of M1D, M2D, and M12
				(the latter determines timing)
13		FBALL		from FBPCH09, all fastbus
				triggers
14		FBTR		to FBPCH10, trigger signal to
				fastbus
15		FBBUSY		from FBPCH11, OR of busy signals from
				fastbus
16		FBALL2		from FBPCH12, should be same as
				FBALL, but in future could be
				used for scaling TDC stops
17				N/C