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Product -Description
Srq Enable; indicates when 8901A is enabled td carry out Serv
ice Requests.
X Response: indicates a valid command was accepted in the
mainframe.
Q Response: indicates a valid data transfer or valid test within
the mainframe.
Look-at-Me: indicates when any CAMAC modules sets
"LAM" (a Service Request).
Inhibit: indicates when CAMAC dataway is inhibited.
GPIB Address Switch
General
Sets the GPIB Address of the 8901A
The 8901A resides in the two slots furthest right in a CAMAC
mainframe and generates all CAMAC dataway signals in re
sponse to commands from a GPIB controller. A standard GPIB
connector on the front panel permits interconnection to any
GPIB system. This allows any GPIB controller to program set
tings, read from or write to any standard CAMAC modules.
Packaging: is in conformance with CAMAC standard, RF
shielded #2 module.
Power Required: is 1.2 A at +6 V.
COMMANDS
Service Request
(SRQ) Setup
Addressing the 8901A and presenting a setup byte determines
the condition which generates an SRQ (Table 1).
Table 1
- SRQ Setup
SRQ Condition
Setup
Byte
LAM
65
(41)
Q=0
66
(42)
X=0
68
(44)
LAM or Q=0
67
(43)
LAM or X=0
69
(45)
Q=0 or X=0
70
(46)
LAM, Q=0 or X
=0
71
(47)
Disable SRQ
64
(40)
Single byte commands - values specified
in decimal
with hex value given in ()
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