Reference

Table 3±1: Passive monitor connector pinouts (Cont.)

Pin

Function

Description

 

 

 

24

Gnd

Logic Ground

 

 

 

25

RSV

Request Service signal5

 

 

 

1

2

To monitor, only use a probe with greater than 1 M impedance.

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.

3If you use pins 8 and 21 (+5 VB) to supply +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 B±4).

4

5

Refer to VMEbus Specification Manual for details on using the ACFAIL* and SYSRESET* signals.

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.

VX1410A & VX1420A IntelliFrame Mainframe Instruction Manual

3±3