     The 2248 (8-bit, 8-channel) and 2249 (11-bit, 12-channel)
charge integrating A/Ds are supported with only a reading property
with the usual SSDNs:

		+---------------------------------------+
		|		   0			|
		+---------------------------------------+
		|	0	   |  28 or 29 (hex)	|
		+---------------------------------------+
		|      crate	   |      slot		|
		+---------------------------------------+
		|	0	   |    subaddress	|
		+---------------------------------------+
		

     Code 28 is for the 2248 card, code 29 is for the 2249.

     The cards are read with F(0) commands.  Thus they are not
cleared by the front end.

     For both cards the readback is left adjusted for convenience
of primary transforms.  Thus the 8 bit readback from the 2248 
appears in bits 2**14 - 2**7;  the 11 bit readback from the 2249
appears in bits 2**14 - 2**4.

     Thus you can use the divide by 32768.0 primary transform on
both types of cards to create a positive floating point number on 
the interval [0,1).

     I am installing this in all front ends tonight.
