Tektronix B020000, Руководство пользователя

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Reference
3–56
SPG422 Component Digital Sync Generator User Manual
Using the Ground-Closure Remote
The rear-panel connector can also be a simple ground-closure remote. (Set
internal jumpers to access this configuration.) In this setup, the 9-pin female
D-connector has one pin tied to ground. All signals are active low.
Figure 3–10 shows the pinout for the Remote connector.
1 Home Signal
2 Increment Bars signal
3 Increment Serial signal
4 Genlock Auto/Internal
5 Preset Select 0 (LSB)
6 Preset Select 1 (MSB)
7 Unused
8 Preset Select Enable
9 Ground
1 2 3 4 5
6 7 8 9
Pin Signal function
Figure 3–10: Pinout for ground-closure control using the Remote connector
The Increment Bars signal and Increment Serial signal lines are intended to be
used with momentary-contact switches. These signals are therefore at a high
priority level, with delays and retriggering implemented in software.
The remaining lines are intended to be used with static-contact switches. These
signals are only acted upon when they change state. While switching, they are at
high priority, but are ignored after being serviced. However, because the remote
control must remain in control for these signals (the remote status cannot be
changed from the instrument), priority is maintained by the remote for all
functions directly controlled by the remote. (For example, if the remote specifies
internal genlock operation, the front panel is not allowed to override it.) All lines
are pulled high internally; Hi (1) = Open, Low (0) = GND.
The Home signal does nothing by itself. If the Increment Bars signal or
Increment Test signal lines are low while the Home Signal Line is low, then the
signal pointer goes to the top of the signal list. This sets the signal
selector to a
known state.
Scrolls through the list of available Bars signals.
Scrolls through the lists of available Serial signals. (Only available if option 2 is
installed.)
Home Signal
Increment Bars Signal
Increment Serial Signal