Diagnostic Connector - HP E8400A C-Size VXI Mainframe User And Service Manual

Diagnostic
Connector
Pin # Function
1 +5 VM
2 -12 VM
3 -24 VM
4 -2 VM
5 Rem Stdby
6 +5 VC
7 +12 VC
8 +5 V Stdby
9 GND
10 SysReset *
11 PS Temp
12 Ref Temp
13 Fans OK *
14 +12 VM
15 +24 VM
16 -5.2 VM
17 GND
18 REM SW
19 V OK *
20 GND
21 +5 V Stdby
22 GND
23 ACFAIL *
24 GND
25 N/C
Chapter 1
The 25-pin Sub-D diagnostic connector provides access to backplane
voltages, power supply and backplane temperatures, and output signals. The
pins are described in Table 1-2.
Table 1-2. Diagnostic Connector Pin Descriptions
+5V backplane voltage monitor (high impedance).
-12V backplane voltage monitor (high impedance).
-24V backplane voltage monitor (high impedance).
-2V backplane voltage monitor ( high impedance).
Remote power on. See "Using the Remote Power-on Pins."
+5 VDC source output (1A maximum).
+12 VDC source output (1A maximum).
Input for +5V STDBY (1A maximum for pins 8 and 21 combined).
Chassis ground.
TTL low-true input signal causes system reset, output indicates system reset.
Output voltage proportional to power supply temperature
rise of 10 mV per degree centigrade).
Output voltage proportional to backplane temperature
rise of 10 mV per degree centigrade). A function of the ambient temperature and
load. At no load, T ref ~ 2 °C + ambient. At full load and high fan speed,
T ref ~ 14 °C + ambient. At full load and low fan speed, T ref ~ 20 °C + ambient.
TTL low-true output voltage indicates power supply and backplane cooling fans
are operating.
+12V backplane voltage monitor ( high impedance).
+24V backplane voltage monitor (high impedance ).
-5.2V backplane voltage monitor ( high impedance).
Chassis ground.
Remote power switch return. See "Using the Remote Power-On Pins.".
TTL low-true output voltage indicating the +5V, ± 12V, ± 24V, -5.2V, and -2V
power supply voltages are within ± 8% of its allowed variation.
Chassis ground.
Input for +5V STDBY (1A maximum for pins 8 and 21 combined).
Chassis ground.
TTL low-true output asserted by the mainframe power monitor at power down or
whenever a loss of power is detected.
Chassis ground.
Unused.
Description
0 VDC at 0
(
0 VDC at 0
(
Using the HP E8400A Mainframe 11
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C, with a
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