Measurement Computing Digital HS User Manual
Page 12
The digital input port contains 16 bits of TTL level inputs, one END line (iEND)
input, two handshake lines (iDAV and iBusy), one control line (\iRESET), two status
lines (SB1 and SB2), and logic supply lines (+5V and ground).
OPEN
S2
SRQ EN FULL
ist EN FULL
iDAV POL
iBUSY POL
iEND POL
iDATA POL
SRQ EN SB1
SRQ EN SB2
8
7
6
5
4
3
2
1
Input Port Feature Selection Switch
Default Settings
2.2.2.2.1 S2-1 SRQ EN Full: Service Request Enable
Service Request (SRQ) Enable causes the Digital488HS/32 to generate a service
request on the IEEE 488 bus when iDAV transitions from the inactive (not Full) to
the active state (Full), indicating the external device has transferred data and the port
is Full. Default is SRQ on Full disabled.
OPEN
S2
SRQ EN FULL
8
7
6
5
4
3
2
1
OPEN
8
7
6
5
4
3
2
1
S2
SRQ EN FULL
SRQ on Full Disabled
(default)
SRQ on Full Enabled
SRQ On Input Port Full Selection