Digital I/O; Digital Input (Trigger Link Input) - Keithley 2750 User Manual

Model 2750 Multimeter/Switch System User's Manual

Digital I/O

Model 2750's Digital I/O port is accessed at a male DB-9 connector located on the rear
panel. The connector location and pin designations are shown in
Figure 9-2
Digital I/O port
DIGITAL I/O TRIG. LINK

Digital input (trigger link input)

When enabled, the Trigger In (pin 6) and Digital Ground (pin 9) can be used as the trigger
link input for external triggering. Pin 6 is physically connected to the input line (pin 2) of
the TRIG LINK connector.
Pin 8 of the digital I/O is used to enable or disable Trigger In. Trigger In is enabled by
leaving pin 8 open, or pulling it high (+5V). Trigger In is disabled by setting pin 8 low
(0V).
NOTE
Model 2750
!
RS-232 IEEE-488
SLT
1
SLT
2
1 2 3
6 7 8
Digital I/O
External triggering is covered in
KEITHLEY
SLOT COVER
KEITHLEY
SLOT COVER
MADE IN
U.S.A.
KEITHLEY
CAT I
SLOT COVER
1 = Digital Output # 1 (low limit 1)
4 5
2 = Digital Output # 2 (high limit 1)
3 = Digital Output # 3 (low limit 2)
4 = Digital Output # 4 (high limit 2)
5 = Digital Output # 5 (master limit)
9
6 = Ext Trig (input)
7 = Diode Clamp
8 = Hardware Interlock (input)
9 = Digital (chassis) Ground
Section 8.
Limits and Digital I/O
Figure 9-2.
SLT
3
SLT
4
!
SLT
5
9-5