Diagnostic Connector - HP E8402A User And Service Manual

Diagnostic Connector

Pin # Function
1 +5 VM
2 -12 VM
3 -24 VM
4 -2 VM
5 Rem On
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 Rtn
19 V OK *
20 GND
21 +5 V Stdby
22 GND
23 ACFAIL*
24 GND
25 RSV
42 Using the Enhanced Monitor
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 2-1. Diagnostic Connector Pin Descriptions
+5V backplane voltage monitor (high impedance). (+4.875 Vdc to +5.125 Vdc)
-12V backplane voltage monitor (high impedance). (-12.6 Vdc to -11.64 Vdc)
-24V backplane voltage monitor (high impedance). (-25.2 Vdc to -23.28 Vdc)
-2V backplane voltage monitor (high impedance). (-2.1 Vdc to -1.9 Vdc)
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.
NOTE: If you use this pin you must not violate VXI specifications.
Output voltage proportional to power supply temperature (0 VDC at 0 °C, with a rise of
10 mV per degree centigrade).
Output voltage proportional to backplane temperature (0 VDC at 0 °C, with a rise of 10 mV
per degree centigrade). A function of the ambient temperature and load.
At no load, T ~ 2 °C + ambient. At full load and high fan speed,
ref
T ~ 14 °C + ambient. At full load and low fan speed, T
ref
TTL low-true output voltage indicates power supply and backplane cooling fans are
operating.
+12V backplane voltage monitor (high impedance). (+11.64 Vdc to +12.6 Vdc)
+24V backplane voltage monitor (high impedance). (+23.28 Vdc to +25.2 Vdc)
-5.2V backplane voltage monitor (high impedance). (-5.46 Vdc to -5.044 Vdc)
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.
Reserved. Used for Timer Verification; refer to Chapter 4.
Description
~ 20 °C + ambient.
ref
Chapter 2