Keithley 7707, User Manual

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3
WARNING Multiple channel operation should only be performed by experienced test engineers who
recognize the dangers associated with multiple channel closures.
Digital I/O
As shown in Figure 1 , channels 11, 12, 13, and 14 are digital I/O channels. Each digital I/O port can be configured as eight bits
of digital input or eight bits of digital output.
Figure 1
Simplified schematic for Model 7707
Note:
HI
LO
Sense
HI
LO
Input
To
27xx
DMM
Channel 17
(See Note)
Backplane
Isolation
Channel 16
(See Note)
Backplane
Isolation
Bit
1–16
Channel 11
DIO
Digital I/O
0
1
2
3
4
5
6
7
Channel 1
HI
LO
Channel 5
HI
LO
(Channels 2–4)
Channel 6
HI
LO
Channel 10
HI
LO
(Channels 7–9)
Channel 15
2-Pole / 4-Pole
(See Note)
Card Sense
HI
LO
Card Input
HI
LO
Channel 12
0
1
2
3
4
5
6
7
Bit
17–32
Channel 13
DIO
Digital I/O
0
1
2
3
4
5
6
7
Channel 14
0
1
2
3
4
5
6
7
Channels 15–17 in this schematic refer to the
designations used for control and not actual
available channels.
These channels can be individually controlled
using multiple channel operation (ROUT:MULT
commands) . For more information, refer to
Section 2 of the Model 27xx User’s Manual.