Reference
2–10
TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual
Table 2–1: Passive monitor connector pinouts (Cont.)
Pin
Description
Function
21
+5 VB
Input for +5 V standby voltage (for example, from an external
battery). Maximum of 1 A total (pins 8 and 21 combined)
2
22
GND
Logic Ground
23
ACFAIL*
Backplane ACFAIL* signal output. If you use this pin, do not violate
the VXIbus electrical specifications (keep the extender cable as
short as possible).
Refer to VMEbus Specification Manual for details on using the
ACFAIL* and SYSRESET* signals.
24
GND
Logic Ground
25
RSV
Request Service signal
3
1
By momentarily grounding this line, the mainframe will toggle from on to off (or vice
versa). The state changes on the falling edge of the signal. Hold the signal low for at
least 500 ms before releasing. Attach only a momentary switch or an open collector
device to drive this line. The line is pulled up to 1 V internally.
2
If you use pins 8 and 21 (+5 VB) to 5 V Standby to the backplane, make sure
that the rear panel jumper is in the correct position (refer to Enhanced Monitor Board
Jumpers on page 4–23).
3
The RSV signal is equivalent to the IEEE 488.1 SRQ signal. The signal is asserted (0)
when an enable event is generated; the signal is unasserted(1) when the event is
cleared by reading the event register. This line is an open collector output. The
signal can be stand-alone or multiple mainframes can be tied together. If you tie
multiple mainframes together, each mainframe must be polled to determine the
source of the service request.
Summary of Contents for TLA 720
Page 13: ...Table of Contents viii TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 22: ...Specifications...
Page 23: ......
Page 38: ...Operating Information...
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Page 105: ...Command Groups 2 66 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 111: ...TEST Subsystem 2 72 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 124: ...Theory of Operation...
Page 125: ......
Page 128: ...Maintenance...
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Page 155: ...Jumper Settings 4 26 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 178: ...Options...
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Page 182: ...Diagrams...
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Page 186: ...Replaceable Mechanical Parts...
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Page 198: ...Replaceable Parts TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual 7 11...
Page 203: ...Replaceable Parts 7 16 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
Page 204: ...Index...
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Page 211: ...Index Index 6 TLA 720 Benchtop Chassis and TLA 7XM Expansion Chassis Service Manual...
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