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Model 2790 SourceMeter Switch System Reference Manual
Enabling/disabling limits
Press SHIFT and then ON/OFF to display the present state (off or on) of limits. To enable
limits, use the
To disable limits, again press SHIFT and then ON/OFF, select "LIMITS: OFF" and press
ENTER.
Digital I/O
Model 2790'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 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 leav-
ing pin 8 open or pulling it high (+5V). Trigger In is disabled by setting pin 8 low (0V).
klqb
or
key to display "LIMITS: ON" and press ENTER.
Model 2790
WARNING:
NO INTERNAL OPERATOR SERVICABLE PARTS,SERVICE BY QUALIFIED PERSONNEL ONLY.
DIGITAL I/O
TRIG. LINK
RS232
MADE IN
U.S.A.
!
KEITHLEY
SLOT COVER
CAUTION:
FOR CONTINUED PROTECTION AGAINST FIRE HAZARD,REPLACE FUSE WITH SAME TYPE AND RATING.
External triggering is covered in
IEEE-488
!
SLT
1
SLT
2
1 = Digital Output # 1 (low limit 1)
1
2
3
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)
6
7
8
9
6 = Ext Trig (input)
DIGITAL I/O
7 = Diode Clamp
8 = Hardware Interlock (input)
9 = Digital (chassis) Ground
Section
8.
9-5
Figure
9-2.
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