<group-name>[<group-number range>] (<item-list>)
where [<group-number range>] is a subset of the allowed group numbers (0 to 1023) and takes the form:
[ <lower-limit>[:<upper-limit>] [,<next lower-limit>[:<next upper-limit>]]r ]
and <item-list> is a list of the items contained within a group separated by commas, where each item consists of a name followed by an optional bit field:
<item-name>[:<number-of-bits>]
Group numbers less than 256 correspond to standard group format; group numbers of 256 upwards correspond to extended group format. Within any one group the format must be the same, ie. group numbers must be in one format range only (0-255 or 256-1023).
A group consists of all the parameters associated with one device, eg. a germanium detector, would have an associated energy word, ballistic deficit correction words, etc. The structure of all devices having the same sets of associated parameters can be specified concisely using group format, eg.
where the group name GE represents a group type consisting of 4 items: E1, E2, TAC and TACBD. defined for group numbers 2,4,5,6,7,8,9,10,19,23,24,25,26.*FORMATS GE[2,4:10,19,23:26] (E1,E2,TAC,TACBD) CLOVER[51:74] (BGOE,BGOT,BGOP, A1,A2,A3,A4, B1,B2,B3,B4, C1,C2,C3,C4, D1,D2,D3,D4) CLOVER1[101:124] (E20, E4TAG1:3, E4DAT1:13) CLOVER2[151:174] (E20, E4TAG1:3, E4DAT1:13, E4TAG2:3, E4DAT2:13)
CLOVER has 19 items defined for group numbers 51 to 74 inclusive, whereas CLOVER1 and CLOVER2 are examples of groups which use bit fields to specify sections of the item data words for ease of access in the *COMMANDS section.
Within the commands section the syntax used to refer to a single item of a particular group would be:
<group-name>[[<group-number>]].<item-name>
where [<group-number>] need only be specified if a range of group numbers have been defined for <group-name>.
would refer to item E1 of group 13.GE[13].E1
would refer to the item E4TAG2, ie. to the top 3 bits of the third data word, of group 153.CLOVER[153].E4TAG2
If only one group number is defined for a single group name, in *FORMATS, then it may be referenced in the commands section without specifying the group number, eg.
would be referenced as:TRIG[255] (S1,S2)
to access the second item of group TRIG.TRIG.S2