HP VXI E1476A Operating instructions

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Where to Find it - Online and Printed Information:
System installation (hardware/software)............VXIbus Configuration Guide*
HP VIC (VXI installation software)*
Module configuration and wiring.......................This Manual
SCPI programming.............................................This Manual
SCPI example programs.....................................This Manual, Driver Disk
SCPI command reference ..................................This Manual
Register-Based Programming.............................This Manual
VXIplug&play programming ............................VXIplug&play Online Help
VXIplug&play example programs .....................VXIplug&play Online Help
VXIplug&play function reference......................VXIplug&play Online Help
Soft Front Panel information..............................VXIplug&play Online Help
VISA language information................................HP VISA User’s Guide
HP VEE programming information....................HP VEE User’s Manual
*Supplied with HP Command Modules , Embedded Controllers, and VXLink.
HP E1476A
64-Channel, 3-Wire Multiplexer Module
User’s Manual and SCP Programming Guide
HP 75000 Series C

Manual Part Number: E1476-90004
Printed in U.S.A. E0596

Contents
HP E1476A 64-Channel, 3-Wire Multiplexer Module
Edition 4
Contents 3
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Declaration of Conformity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Reader Comment Sheet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Chapter 1
HP E1476A Multiplexer Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Using This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Configuring the Multiplexer Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Module Use and Logical Address Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Setting the Logical Address Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Interrupt Priority . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Installing the Multiplexer in a Mainframe. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Terminal Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Spring Clamp Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Terminal Module Option A3E . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Terminal Module Option A3F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Mounting and Connecting the HP E1586A Rack Mount Terminal Panel. . . . . . . . . 24
Connecting the HP E1586A Rack Mount Terminal Panel . . . . . . . . . . . . . . . . . 24
HP E1586A Option 001 HF Common Mode Filters . . . . . . . . . . . . . . . . . . . . . 24
Mounting the HP E1586A Rack Mount Terminal Panel . . . . . . . . . . . . . . . . . . 24
Connecting the Analog Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Wiring a Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Attaching a Terminal Module to the Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Connecting User Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Programming the Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Specifying SCPI Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Channel Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Card Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Initial Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Chapter 2
HP E1476A Switchbox Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Reset Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Switching or Scanning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Switching Channels to the Analog Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Temperature Measurements By Channel Switching . . . . . . . . . . . . . . . . . . . . . . . . . 44
Scanning Channels Using the Analog Bus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

4 Contents
Notes on Scanning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Recalling and Saving States. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Saving States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Recalling States . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Detecting Error Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Using Interrupts With Error Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Using the HP E1586A Rack Mount Terminal Panel. . . . . . . . . . . . . . . . . . . . . . . . . 56
Channel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Analog Bus Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Reference Thermistor Connections and Operations . . . . . . . . . . . . . . . . . . . . . . 57
Chapter 3
HP E1476A Switchbox
Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Using This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Command Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Common Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
SCPI Command Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
SCPI Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
ABORt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
ARM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
ARM:COUNt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
ARM:COUNt? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
DISPlay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
DISPLay:MONitor:CARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
DISPLay:MONitor:CARD? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
DISPLay:MONitor[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
DISPLay:MONitor[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
INITiate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
INITiate:CONTinuous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
INITiate:CONTinuous? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
INITiate[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
OUTPut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
OUTPut:ECLTrgn[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
OUTPut:ECLTrgn[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
OUTPut[:EXTernal][:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
OUTPut[:EXTernal][:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
OUTPut:TTLTrgn[:STATe] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
OUTPut:TTLTrgn[:STATe]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
[ROUTe:]. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
[ROUTe:]CLOSe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
[ROUTe:]CLOSe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
[ROUTe:]OPEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
[ROUTe:]OPEN? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
[ROUTe:]SCAN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
[ROUTe:]SCAN:MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Contents 5
[ROUTe:]SCAN:MODE? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
[ROUTe:]SCAN:PORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
STATus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
STATus:OPERation:CONDition? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
STATus:OPERation:ENABle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
STATus:OPERation:ENABle? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
STATus:OPERation[:EVENt]? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
STATus:PRESet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
SYSTem. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
SYSTem:CDEScription? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
SYSTem:CPON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
SYSTem:CTYPe? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
SYSTem:ERRor? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
TRIGger. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
TRIGger[:IMMediate] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
TRIGger:SOURce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
TRIGger:SOURce? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
SCPI Command Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
IEEE 488.2 Common Command Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92
Chapter 4
HP E1476A Scanning Voltmeter Application Examples . . . . . . . . . . . . . . . . . . . . 93
Using This Chapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Reset Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
The Scanning Voltmeter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Making Measurements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Scanning Voltmeter Measurement Program . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Voltage Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
2-Wire Ohms Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
4-Wire Ohms Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Thermocouple Temperature Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Thermistor Temperature Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
Scanning Voltmeter Command Quick Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Appendix A
HP E1476A Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Relay life . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
Appendix B
HP E1476A Register-Based Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
About This Appendix. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Register Addressing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
The Base Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Register Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
The WRITE Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

6 Contents
The READ Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
The ID Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
The Device Type Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
The Status/Control Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Relay Control Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Program Timing and Execution. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Closing Channels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
Using a Multimeter with the Multiplexer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Programming Examples. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
System Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Example Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Appendix C
HP E1476A Multiplexer Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Error Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Front Matter 7
Certification
Hewlett-Packard Company certifies that this product met its published specifications at the time of shipment from the factory. Hewlett-
Packard further certifies that its calibration measurements are traceable to the United States National Institute of Standards and
Technology (formerly National Bureau of Standards), to the extent allowed by that organization’s calibration facility, and to the
calibration facilities of other International Standards Organization members.
Warranty
This Hewlett-Packardproduct is warrantedagainst defects in materials andworkmanship fora period of threeyears from date of shipment.
Duration and conditions of warranty for this product may be superseded when the product is integrated into (becomes a part of) other HP
products. During the warranty period, Hewlett-Packard Company will, at its option, either repair or replace products which prove to be
defective.
For warranty service or repair, this product must be returned to aservice facility designatedby Hewlett-Packard (HP).Buyer shall prepay
shipping charges to HP and HP shall pay shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges,
duties, and taxes for products returned to HP from another country
HP warrants that its software and firmware designated by HP for use with a product will execute its programming instructions when
properly installed on that product. HP does not warrant that the operation of the product, or software, or firmware will be uninterrupted
or error free.
Limitation Of Warranty
The foregoing warranty shall not applyto defects resulting from improper or inadequate maintenance by Buyer, Buyer-suppliedproducts
or interfacing, unauthorized modification or misuse, operation outside of the environmental specifications for the product, or improper
site preparation or maintenance.
The design and implementation of any circuit on this product is the sole responsibility of the Buyer. HP does not warrant the Buyer’s
circuitry or malfunctions of HP products that result from the Buyer’s circuitry. In addition, HP does not warrant any damage that occurs
as a result of the Buyer’s circuit or any defects that result from Buyer-supplied products.
NO OTHER WARRANTY IS EXPRESSED OR IMPLIED. HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Exclusive Remedies
THE REMEDIES PROVIDED HEREIN ARE BUYER’S SOLE AND EXCLUSIVE REMEDIES. HP SHALL NOT BE LIABLE FOR
ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT,
TORT, OR ANY OTHER LEGAL THEORY.
Notice
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1987)(or any equivalent agency regulation or contract clause), whichever is applicable. You have only those rights provided for such
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HP E1476A Multiplexer User’s Manual
Edition 4
Copyright © 1994, 1995, 1996 Hewlett-Packard Company. All Rights Reserved.

8 Front Matter
Safety Symbols
Instruction manual symbol affixed to
product. Indicates that the user must refer to
the manual for specific WARNING or
CAUTION information to avoid personal
injury or damage to the product.
Alternating current (AC)
Instruction manual symbol affixed to
product. Indicates that the user must refer to
the manual for specific WARNING or
CAUTION information to avoid personal
injury or damage to the product.
Indicates the field wiring terminal that must
be connected to earth ground before
operating the equipmentÅprotects against
electrical shock in case of fault.
Direct current (DC).
Indicates hazardous voltages.
or Frameorchassisgroundterminal—typically
connects to the equipment's metal frame.
WARNING Calls attention to a procedure, practice, or
condition that could cause bodily injury or
death.
CAUTION Calls attention to a procedure, practice, or
conditionthatcouldpossiblycausedamageto
equipment or permanent loss of data.
WARNINGS
The following general safety precautions must be observed during all phases of operation, service, and repair of this product. Failure to
comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture, and
intended use of the product. Hewlett-Packard Company assumes no liability for the customer's failure to comply with these requirements.
Ground the equipment: For Safety Class 1 equipment (equipment having a protective earth terminal), an uninterruptible safety earth
ground must be provided from the mains power source to the product input wiring terminals or supplied power cable.
DO NOT operate the product in an explosive atmosphere or in the presence of flammable gases or fumes.
For continued protection against fire, replace the line fuse(s) only with fuse(s) of the same voltage and current rating and type. DO NOT
use repaired fuses or short-circuited fuse holders.
Keep away from live circuits: Operating personnel must not remove equipment covers or shields. Procedures involving the removal of
covers or shields are for use by service-trained personnel only. Under certain conditions, dangerous voltages may exist even with the
equipment switched off. To avoid dangerous electrical shock, DONOT perform procedures involving cover orshield removal unless you
are qualified to do so.
DO NOT operate damaged equipment: Whenever it is possible that the safety protection features built into this product have been
impaired, either through physical damage, excessive moisture, or any other reason, REMOVE POWER and do not use the product until
safe operation can be verified by service-trained personnel. If necessary, return the product to a Hewlett-Packard Sales and Service Office
for service and repair to ensure that safety features are maintained.
DO NOT service or adjust alone: Do not attempt internal service or adjustment unless another person, capable of rendering first aid and
resuscitation, is present.
DO NOT substitute parts or modify equipment: Because of the danger of introducing additional hazards, do not install substitute parts
or perform any unauthorized modification to the product. Return the product to a Hewlett-Packard Sales and Service Office for service
and repair to ensure that safety features are maintained.
Documentation History
All Editions and Updates of this manual and their creation date are listed below. The first Edition of the manual is Edition 1. The Edition
number increments by 1 whenever the manual is revised. Updates, which are issued between Editions, contain replacement pages to
correct or add additional information to the current Edition of the manual. Whenever a new Edition is created, it will contain all of the
Update information forthe previous Edition. Each new Edition or Update also includes a revised copy of this documentation history page.
Edition 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .June 1994
Edition 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . February 1996
Edition 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . March 1996
Edition 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .May 1996

Front Matter 9
Declaration of Conformity
according to ISO/IEC Guide 22 and EN 45014
Manufacturer’s Name: Hewlett-Packard Company
Loveland Manufacturing Center
Manufacturer’s Name: Hewlett-Packard Company
Loveland Manufacturing Center
declares, that the product:
Product Name: 64-Channel, 3-Wire Multiplexer
Model Number: HP E1476A
Product Options: All
conforms to the following Product Specifications:
Safety: IEC 1010-1 (1990) Incl. Amend 1 (1992)/EN61010-1 (1993)
CSA C22.2 #1010.1 (1992)
UL 1244
EMC: CISPR 11:1990/EN55011 (1991): Group 1 Class A
IEC 801-2:1991/EN50082-1 (1992): 4kVCD, 8kVAD
IEC 801-3:1984/EN50082-1 (1992): 3 V/m
IEC 801-4:1988/EN50082-1 (1992): 1kV Power Line
.5kV Signal Lines
Supplementary Information: The product herewith complies with the requirements of the Low Voltage Directive
73/23/EEC and the EMC Directive 89/336/EEC (inclusive 93/68/EEC) and carries the "CE" mark accordingly.
Tested in a typical configuration in an HP C-Size VXI mainframe.
May, 1996 Jim White, QA Manager
European contact: Your local Hewlett-Packard Sales and Service Office or Hewlett-Packard GmbH, Department
HQ-TRE, Herrenberger Straße 130, D-71034 Böblingen, Germany (FAX [phone])

10 Front Matter
Notes:

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Chapter 1 HP E1476A Multiplexer Setup 13
Chapter 1
HP E1476A Multiplexer Setup
Using This Chapter
This chapter provides one page of general module information followed by
WARNINGS and CAUTIONS, and the tasks you must perform to set up
yourMultiplexer.It alsoprovidesinformationtoverifyyour installationwas
successful. Chapter contents are:
•Warnings and Cautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 14
•Configuring the Multiplexer Module . . . . . . . . . . . . . . . . . . Page 16
•Installing the Multiplexer in a Mainframe . . . . . . . . . . . . . . Page 19
•Terminal Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 20
•Mounting and Connecting the HP E1586A Rack Mount Terminal Panel
Page 24
•Connecting the Analog Bus . . . . . . . . . . . . . . . . . . . . . . . . . Page 26
•Wiring a Terminal Module . . . . . . . . . . . . . . . . . . . . . . . . . . Page 28
•Attaching a Terminal Module to the Multiplexer . . . . . . . . . Page 30
•Connecting User Inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 31
•Programming the Multiplexer. . . . . . . . . . . . . . . . . . . . . . . . Page 33
•Initial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 35
General Information •The term “Multiplexer” is used in this manual to refer to the
HP E1476A 64-Channel, 3-Wire Multiplexer Module.
•The HP E1476A is a VXIbus C-size register-based slave device. The
Multiplexer can operate in a C-size VXIbus mainframe or a VMEbus
mainframe.
•The Multiplexer “instrument” is the firmware running in the
Upcoming Module (HP E1406A, for example). This firmware is the
instrument driver providing SCPI (Standard Commands for
Programmable Instruments) programming capability. The term
“switchbox” is used to refer to an “instrument” made up of one or
more switch modules.
•Programming the HP E1476A can either be through the command
module using SCPI commands (see Chapter 3), through an embedded
controller using Compiled SCPI (C-SCPI, see the HP catalog for
details on this product) or Standard Instrument Control Language
(SICL) or via direct register access (register-based programming - see
Appendix B).
•Reed relays are used for each channel and tree relay.
•Maximum voltage is 120VDC/RMS or 170V peak.
•Maximum current is 35mA (non-inductive).

14 HP E1476A Multiplexer Setup Chapter 1
•Thermal offset is <4µV per channel (<2mV using maximum
integration time with 10 samples averaged).
Warnings and Cautions
WARNING SHOCK HAZARD. Only qualified, service-trained personnel who
are aware of the hazards involved should install, configure, or
remove the Multiplexer Module. Disconnect all power sources
from the mainframe, the Terminal Modules, and installed
modules before installing or removing a module.
WARNING When handling user wiring connected to the Terminal Module,
consider the highest voltage present accessible on any
terminal. Use only wire with an insulation rating greater than
the highest voltage which will be present on the Terminal
Module. Do not touch any circuit element connected to the
Terminal Module if any other connector to the Terminal Module
is energized to more than 30VACRMS or 60VDC.
Caution MAXIMUM VOLTAGE/CURRENT. Maximum allowable voltage
per channel, terminal-to-terminal or terminal-to-chassis for the
Multiplexer is 120Vdc or 120Vacrms (170Vac peak). Maximum
current per channel is 35mA (non-inductive). Maximum
transient voltage is 1300V peak. Exceeding any limit may
damage the Multiplexer Module.
Caution WIRING THE TERMINAL MODULE. When wiring to the terminal
connectors on the E1476A Terminal Module, be sure not to
exceed a 5mm strip back of insulation to prevent the possibility
of shorting to other wiring on adjacent terminals.
Caution STATIC ELECTRICITY. Static electricity is a major cause of
component failure. To prevent damage to the electrical
components in the Multiplexer, observe anti-static techniques
whenever removing, configuring, and installing a module. The
Multiplexer is susceptible to static discharges. Do not install
the Multiplexer Module without its metal shield attached.

Chapter 1 HP E1476A Multiplexer Setup 15
Figure 1-1. HP E1476A Simplified Schematic
Anaolog Bus connection for
HP E1411/E1326 Multimeter

16 HP E1476A Multiplexer Setup Chapter 1
Configuring the Multiplexer Module
The Multiplexer Module can be configured as a switchbox (either
single-module or multiple-module), or as a scanning voltmeter with the
HP E1411B (or E1326B) 5-Digit Multimeter.
Module Use and
Logical Address
Selection
Figure 1-2. Logical Address, Module (card) Number, and Channel Address
SWITCHBOX
A switchbox configuration uses the “SWITCH” instrument
driver.
A switchbox uses the commands and command reference
in Chapter 3 of this manual.
•MULTIPLE-MODULE SWITCHBOX:
The channel address (channel_list) has the form (@ccnn)
where:cc = card number
nn = channel number
•SINGLE-MODULE SWITCHBOX:
A single-module switchbox has channel addresses in the
form (@nn).
Channel address example (multiple-module):
Channel 31 on card number 02 is addressed by (@231).
Switchbox applications are provided in Chapter 2
SCANNING VOLTMETER
A scanning voltmeter configuration uses the voltmeter
instrument driver “VOLTMTR”. The scanning voltmeter
commands are different from the switchbox commands
defined in Chapter 3.
A scanning voltmeter uses the commands and command
reference found in the
HP E1326B/E1411B 5-Digit
Multimeter User’s Manual
to controlthe switches and make
measurements. See the CONFigure and MEASure
commands in the multimeter manual.
A quick reference of HP E1411B/E1326B multimeter
commands is provided in Chapter 4 along with application
information.
Scanning voltmeter applications are provided in
Chapter 4.

Chapter 1 HP E1476A Multiplexer Setup 17
Setting the Logical
Address Switch The logical address switch factory setting is 112. Valid addresses are from
1 to 254 for static configuration (the address you set on the switch) and
address 255 for dynamic configuration. The E1476A supports dynamic
configuration of the address. This means the addressis set programmatically
by the resource manager when it encounters a module with address 255 that
supports dynamic configuration.
The Multiplexer Module can be configured as a switchbox or as a scanning
voltmeter in conjunction with an HP E1411B or E1326B Multimeter. Refer
to the C-Size VXIbus System Installation and Getting Started Guide for
addressing information. Refer to Figure 1-3 for switch position information.
Note When using an HP command module (HP E1406A, for example) the
address switch value must be a multiple of 8 if the module is the first
module in a switchbox used with a VXIbus command module using SCPI
commands. When in the scanning voltmeter configuration, the address
switch value must be sequential to the voltmeter address (see "Figure 1-2.
Logical Address, Module (card) Number, and Channel Address".
Figure 1-3. Setting the Logical Address

18 HP E1476A Multiplexer Setup Chapter 1
Setting the Interrupt
Priority For most applications this priority level should not have to be changed.
Interrupts are enabled at power-up, after a SYSRESET or after resetting the
module via the Control Register. An interrupt is generated after any relay
Control Register is accessed when interrupts are enabled. The interrupt is
generated approximately 1.3ms after one of the registers is accessed. The
interrupt priority rotary switch selects which priority level will be asserted.
The interrupt priority switch is set in position 1 when shipped from the
factory. The interrupts are disabled when set to level “0”. Be careful when
deciding to disable the interrupts, both the HP “VOLTMTR” and
“SWITCH” drivers require interrupts be enabled.
The interrupt priority switch is identified on the sheet metal shield as IRQ.
A hole has been cut into the shield for access. Interrupts can also be disabled
using the E1476A Status/Control Register.
To change the setting, simply rotate the switch so the arrow points to the
interrupt priority level you desire.
Note Older HP mainframes require backplane jumpers be set correctly for each
slot you use. Consult your mainframe manual.
Figure 1-4. Setting Interrupt Request (IRQ) Priority

Chapter 1 HP E1476A Multiplexer Setup 19
Installing the Multiplexer in a Mainframe
The HP E1476A may be installed in any slot (except slot 0) in a C-size
VXIbus mainframe. Refer to Figure 1-5 to install the Multiplexer in a
mainframe.
Figure 1-5. Installing the Multiplexer in a VXIbus Mainframe
1Set the extraction levers out. 2Slide the HP E1476A into any slot
(except slot 0) until the backplane
connectors touch.
3Seat the multiplexer into the
mainframe by pushing in the
extraction levers
Extraction
Levers
4Tighten the top and bottom screws to
secure the multiplexer module
to the mainframe.
To remove the multiplexer from the mainframe,
reverse the procedure.
NOTE: The extraction levers will not
seat the backplane connectors on older
VXIbus mainframes. You must manually
seat the connectors by pushing in the
module until the module’s front panel is
flush with the front of the mainframe.
The extraction levers may be used to
guide or remove the multiplexer.