DLS 50 Operating Manual

Operating Manual

DLS 50

ISDN Wireline Simulator

Revision 5
January 1, 2000

TestW rks

Page i

TABLE OF CONTENTS

1. INTRODUCTION................................................................1

1.1 About this Manual................................................................. 1

1.2 Receiving and Unpacking the Unit ........................................ 1

1.3 DLS 50 Overview.................................................................. 2

2. ISDN BACKGROUND........................................................5

2.1 The ISDN U-Interface ........................................................... 5

2.2 ANSI Specifications............................................................... 6

3. OPERATION .......................................................................7

3.1 Powering On the DLS 50....................................................... 7

3.2 Connecting the DLS 50.......................................................... 9

3.3 Changing the Cable Length................................................... 9

3.4 Configuring the DLS 50........................................................10

4. REMOTE CONTROL.......................................................13

4.1 IEEE 488 Interface...............................................................14

4.1.1 IEEE 488.1 Interface functions supported............................... 14

4.1.2 IEEE 488 Address ..................................................................14

4.1.3 The SRQ Line......................................................................... 14

4.1.4 Resetting the DLS 50..............................................................16

4.1.5 Message Terminators .............................................................. 16

4.2 RS-232 Serial Interface ........................................................16

4.2.1 Baud Rate...............................................................................17

4.2.2 Data Format............................................................................17

4.2.3 Flow Control...........................................................................17

4.2.4 Message Terminators .............................................................. 19

4.3 Data formats.........................................................................19

4.4 Command Syntax..................................................................20

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4.5 Status Reporting...................................................................21

4.5.1 Status Byte Register (STB)......................................................22

4.5.2 Event Status Register (ESR)....................................................23

4.6 Common Command Set........................................................24

4.7 Device Dependent Command Set..........................................30

4.7.1 :SETting:CHANnel:LENgth <NRf> .......................................30

4.7.2 :SYStem:COMMunicate:GPIB:ADDRess <NRf> ...................31

4.7.3 :SYStem:COMMunicate:SERial:BAUD <NRf>...................... 31

4.7.4 :SYStem:COMMunicate:SERial:FORMat <format>...............32

4.7.5 :SYStem:COMMunicate:SERial:PACE <pace>......................33

4.8 DLS 50 Synchronization.......................................................34

4.9 References.............................................................................35

5. WARRANTY......................................................................36

6. SHIPPING THE DLS 50....................................................38

7. SPECIFICATIONS............................................................39

7.1 ELECTRICAL.....................................................................41

7.1.1 AC Power............................................................................... 41

7.2 ENVIRONMENTAL...........................................................41

7.3 MECHANICAL...................................................................41

7.4 OPERATING CONDITIONS.............................................41

8. SAFETY .............................................................................43

8.1 INFORMATION..................................................................43

8.1.1 Protective Grounding (Earthing) ............................................. 43

8.1.2 Before Operating the Unit ....................................................... 43

8.1.3 Supply Power Requirements....................................................43

8.1.4 Mains Fuse Type.....................................................................44

8.1.5 Connections to a Power Supply...............................................44

8.1.6 Operating Environment ..........................................................44

8.1.7 Class of Equipment................................................................. 44

8.2 INSTRUCTIONS.................................................................44

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8.2.1 Before Operating the Unit ....................................................... 45

8.2.2 Operating the Unit..................................................................45

8.3 SYMBOLS ...........................................................................46

INDEX.......................................................................................47

Introduction

Page 1

1. INTRODUCTION

1.1 About this Manual

The DLS 50 Operating Manual can be used to learn about the unit for the first time, or
can be used as a look up reference book. We suggest that you carefully read the
introduction sections of this manual before powering on your unit. Failure to do so
could damage your DLS 50.

If you still have questions after reading this manual, please contact your DLS TestWorks
sales representative or our customer service department at the location shown in section
5, "Warranty" of this manual. If you have any suggestions as to how this manual could
be improved, please write to us at the same address.

Thank you for your business and for choosing DLS TestWorks.

1.2 Receiving and Unpacking the Unit

The DLS 50 has been shipped to you in a reinforced cardboard shipping container. We
recommend that you retain this carton for any future shipments.

Please check that you have received all the items as per the packing list and report any
discrepancies as soon as possible. Please also note that some options are installed within
the chassis of the main unit and can only be checked by powering on the unit.

The DLS 50 supports many AC voltages found in various parts of the world. We have
already selected the voltage appropriate to your country according to the information we
had. But errors do occur... so read section 3.1 "Powering on the DLS 50" before
switching on the DLS 50.

Introduction

Page 2

1.3 DLS 50 Overview

The DLS 50 simulates a 2 wire length of cable using standard DLS TestWorks ISDN
bandwidth ladders. The user can easily change the length of the simulated cable by
using the front panel of the DLS 50 or by using a computer. It is meant to be used in
laboratories, production lines etc. to simulate "real life" wireline situations on bench top.

The DLS 50 can be ordered in various gauges and in 2 lengths, standard and extended .
The user can purchase the standard unit, and then later decide to upgrade to the
extended version.

The devices under test are connected to the DLS 50 using either the RJ-45 connectors or
the terminal block, located at the front or at the back. All the connectors on each side
are connected in parallel.

The unit can be controlled via the IEEE 488 and the RS-232 serial interfaces. One
simple command is all that is needed to set the channel length, but other IEEE 488.2
and SCPI commands are also supported.

The main component of the DLS 50 is the mother board, which holds

• The simulation circuitry

• The microprocessor and all the control logic

• The power supply

• Analog connectors (RJ-45 and terminal block)

• Digital Interfaces (RS-232 and IEEE 488)

The mother board has a front panel board attached which holds the display and the keys.

The components are mounted on a frame which slides into a housing. The dimensions of
the assembled unit are approximately 2.5H x 17.0W x 15.0D (6 cm H x 43 cm W x 38
cm D), and weight about 10 lbs (4.5 kg).

Introduction

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The standard DLS 50 simulates 12 kft or 3.6 km of wireline. The extended version
provides an additional 8 kft or 2.4 km of wireline. The various types of DLS 50 that are
presently available are:

Standard DLS 50 Extended DLS 50

22 AWG, 12 kft 22 AWG, 20 kft
24 AWG, 12 kft 24 AWG, 20 kft
26 AWG, 12 kft 26 AWG, 20 kft

0.4 mm PE, 3.6 km 0.4 mm PE, 6.0 km

0.6 mm German, 3.6 km 0.6 mm German, 6.0 km

Fig. 1.1 The DLS 50's Front Panel

1. Liquid crystal display (LCD).

2. Menu control / setup keys.

3. RJ-45 modular connector for device under test, one on each end of the

wireline (internally connected to items 9, 10 and 11).

4. Power switch

Introduction

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Fig. 1.2 The DLS 50's Back Panel

5. AC power input plug

6. Power voltage selector and fuse case

7. IEEE 488 interface connector for remote control.

8. RS-232 serial interface connector for remote control.

9. Modular connector for device under test (internally connected to items 3,

10 and 11).

10. Modular connector for injection of impairments (internally connected to

items 3, 9 and 11).

11. Terminal strip for connection to device under test (internally connected to

items 3, 9 and 10).

Getting Started

Page 5

2. ISDN BACKGROUND

The Integrated Services Digital Network (ISDN) emerged in the late 1970's as a means
of integrating different information streams, and re-implementing the analog network at
that time into a digital transmission scheme. This development was a result of the
demand from corporate users. The ISDN concept materialized when the CCITT (The
International Telephone and Telegraph Consultative Committee) employed the concept
and started developing a set of standards for a universal Integrated Services Digital
Network.

ISDN has a very broad specification which includes Primary Rate (1.544 Mbps
composed of 23 x 64 kbit/sec. B channels plus 1 x 64 kbit/sec. D channel in N. America,
or 2.048 Mbps composed of 30 B channels plus 1 D channel in Europe), Basic Rate ( 2 x
64kbit/sec. B channels plus 1 x 16kbit/sec. D channel ), and Broadband ( video / data /
voice in various configurations ). Primary Rate requires a 1.544 Mbit/sec. connection for
its 24 channels (or 2.048 Mbit/sec. for 31 channels in Europe), and is meant for users
who require high-speed communications (e.g. Local Area Network). Basic Rate requires
a 144 kbit/sec.* connection for its three channels, and is meant for most end users.
Broadband can achieve transfer rates of 150 Mbit/sec, and is meant to integrate with the
broadband capability of fibre optics. The distribution of the ISDN signals is complex, as
they are being carried by the existing network. For the purposes of this manual, we will
concentrate on the distribution of ISDN signals at the basic rate from the central office
to the end user site.

* Depending on the interfaces, the total bit rate will be different. For the U-interface, the
total will be 160 kbps; for S/T interface, it will be 192 kbps.

2.1 The ISDN U-Interface

To and from the central office, basic rate ISDN signals are sent via the 2-Wire twisted
copper pair known as the U-Interface. These bi-directional 160 kbps (i.e. 144 kbps with
16 kbps overhead) signals are coded as either a 2B1Q signal, or a 4B3T signal
depending on the administration. The DLS 50 is especially suited to simulate line

Getting Started

Page 6

conditions for either of these. The signal is terminated at the customer premises via a
Network Terminator (NT).

The DLS 50 simulates the physical parameters of the U-interface in order to stress test
U-interface transmission products.

2.2 ANSI Specifications

ANSI specification T1.601 describes the physical characteristics of the two wire ISDN
U-Interface. Described are the limits (pulse masks etc.) of the signals as they are
specified on the U-interface, the physical cable specifications and the testing procedures
for devices which connect to the ISDN U-Interface.

Similar specifications have also been drafted by ETSI for the two wire U-Interface.

Getting Started

Page 7

3. OPERATION

3.1 Powering On the DLS 50

Before switching on the DLS 50, verify that the line voltage selection shown at the back
of the unit corresponds to the local line voltage. If it is different, then do the following:

• Remove the power cord

• Open the fuse box cover in the power module at the back using a small flat

screwdriver

• Pull the voltage selector card

• Turn the plastic knob until you have selected your local power voltage

• Put everything back together

• Check that the white dot is now beside your local line voltage.

The DLS 50 uses a two fuse configuration.

To operate the DLS 50, connect the unit to the power source, and turn on the unit.

One convenient feature of the DLS 50 is that the last configuration used is kept latched
into the relays, allowing the unit to be used even when the power is turned off. As an
option, the wireline length may be restored or reset to zero. There will be a short
disconnection at power up while performing the self-test.

On power up, the DLS 50 performs a self-test, and will show for about two seconds the
following screen:

DLS 50 PwrOn: EPROM: WireLn:
SelfTest DipSw: NVRAM:

µ - Ctrl:

Fig. 3.1: Self-Test Screen

Getting Started

Page 8

The self-test results can be maintained on screen by keeping the left arrow key pressed
when the power is turned on. If one of the self-test fails, the DLS 50 will show an error
screen with some explanation of the problem, in which case call the factory. Following
is a short description of the self-test done by the DLS 50 after a reset.

PwrOn: The self-test will show "Yes" if the last reset was caused by a power

on, and will show "No" if it was caused by the IEEE 488 interface

EPROM: Check if the checksum of the EPROM is valid.

Ladder: Check if all the ladders and the relays are functional. This test is not

as extensive as the one done by the factory, but it provides an early
warning of possible failure.

DipSw: Check if the dip switch configuration is valid. The dip switch

indicates which type of ladders are installed in the DLS 50.

NVRAM: Check if the non volatile RAM and its imbedded battery are

functional. The battery has an expected life of over 10 years, and if
necessary, can easily be replaced.

µ-Ctrl: Check if the micro-controller is functional.

After the self-test, the display will show the type of the cable and the current cable
length.

A – 12000 ft – B DLS 50

24 AWG Max: 20000 ft

Fig. 3.2 Simulated Cable Length in feet

A – 6000 ft – B DLS 50

0.4 mm PE Max: 6000 m

Fig. 3.3 Simulated Cable Length in metres

Getting Started

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3.2 Connecting the DLS 50

The side A of the simulated wireline can be accessed from any of the RJ-45 connectors
labelled "A" at the front or at the back of the DLS 50, or from the terminal blocks at the
back of the DLS 50. The user can also inject impairments to side A of the wireline by
using the "noise" RJ-45 connector on the back of the DLS 50.

Side B of the simulated wireline can be accessed from any of the RJ-45 and terminal
blocks labelled "B" as explained above.

Note that all the RJ-45 connectors and terminal blocks on each side are connected in
parallel.

The DLS 50 provides a fully bi-directional wireline simulation.

Fig. 3.4 DLS 50 internal connection paths

3.3 Changing the Cable Length

The unit can be controlled via the 4 arrow keys on the front panel. The left and right
arrow keys select the digit to be set, and the up and down keys select the value of that
digit. When reaching the maximum or the minimum, the value stops changing. The
display will show the current length of the simulated cable, the type of wireline, and the
maximum length shown on the right bottom section of the screen.

Getting Started

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The resolution of the cable length is 100 ft for units that use feet, and 50 m for units that
use metres.

The DLS 50 sets the cable length after 1 second of keyboard inactivity .

3.4 Configuring the DLS 50

Pressing both the Left and Right arrow keys at the same time gets into the unit setup
menus, where some of the operational characteristics of the unit can be changed.

The user can move among the different fields using the Left and Right arrows. The Up
and Down arrows will change the setting of the selected feature. On any of the setting
screens, pressing both Left and Right arrow keys at the same time returns to the main
screen.

1 – LCD Contrast : 7 [0…10]

More à

Fig. 3.5 LCD Contrast

To change the contrast of the display use the following steps:

• From the main screen, press both the left and right arrows simultaneously.

• Use the up and down arrows to select the desired contrast.

• Press the left and right arrows simultaneously to return to the main screen.

The contrast value is saved in non-volatile RAM, and will be restored on power up. The
default contrast is 7.

2 – IEEE 488 Address: 13 [0…30]
ß More More à

Fig. 3.6 IEEE 488 Address

Getting Started

Page 11

To change the IEEE 488 address of the DLS 50 use the following steps:

• From the main screen, press both the left and right arrows simultaneously.

• Press the right arrow once to get to the IEEE 488 Address screen.

• Use the up and down arrows to select the desired address.

• Press the left and right arrows simultaneously to return to the main screen.

The address is saved in non-volatile RAM, and will be restored on power up. The
default is 13. See section 4.1.2 for more details.

3 – Serial: 9600 N81 Flow Ctrl:CTS
ß More More à

Fig. 3.7 RS-232 Interface

To change the serial interface baud rate, data format or flow control, use the following
steps:

• Press both the left and right arrows simultaneously

• Press the right arrow until you get to the RS-232 Serial interface protocol

screen

• Use the up and down arrows to select the desired baud rate.

• Press the right arrow key

• Use the up and down arrows to select the desired data format.

• Press the right arrow key

• Use the up and down arrows to select the desired flow control method.

• Press the left and right arrows simultaneously to return to the main screen.

The parameters are saved in non-volatile RAM, and will be restored on power up. The
defaults are 9600, N81 and CTS. See section 4.2 for more details.

4 – Restore Setting on Power up: Yes
ß More More à

Fig. 3.8 Restore on Power up

Getting Started

Page 12

On power up, the DLS 50 can restore the length of the wireline that was used when the
power was turned off, or it can set the length to 0. To change the setting use the
following steps:

• From the main screen, press both the left and right arrows simultaneously.

• Press the right arrow until you get to the Restore Setting screen.

• Use the up and down arrows to select the desired setting.

• Press the left and right arrows simultaneously to return to the main screen.

The setting is saved in non-volatile RAM, and will be restored on power up. The default
is yes.

5 – Checksum: 1A2B3C Version:05 RAM:OK
ß More

Fig. 3.9 System Status

The last screen shows the checksum of the EPROM, the version of the firmware and the
non-volatile RAM state. No change can be done in that screen.

Remote Control

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4. REMOTE CONTROL

The DLS 50 can be remote-controlled via the IEEE 488 (also known as the GPIB bus)
and RS-232 (serial) interface, allowing the integration of the DLS 50 into a larger test
system.

The DLS 50 remote control is designed with several standards in mind:

• The GPIB physical interface follows IEEE 488.1. The functions

implemented are outlined in Section 4.1 "IEEE 488 Interface".

• The Common Commands follow IEEE 488.2.

• The Device Dependent Commands (see Section 4.7) are based upon the

Standard Commands for Programmable Interfaces (SCPI). However, we
had to create some device dependant commands since there was no pre­defined SCPI command that could apply to the DLS 50.

• The serial port physical interface follows the EIA RS-232 standard.

The IEEE 488 and the serial interfaces are always enabled, and can be used
alternatively. The DLS 50 directs its output to the last interface it received data from.
Both interfaces use the same command set and produce the same results.

Section 4.1 and 4.2 describe the functions specific to one particular interface, the
remainder of section 4 describes the commands that are common to both interfaces.

Remote Control

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4.1 IEEE 488 Interface

4.1.1 IEEE 488.1 Interface functions supported

The IEEE 488.1 Interface functions supported by the DLS 50 are as follows :

SH1 Source handshake - full capability
AH1 Acceptor handshake - full capability
T5 Basic talker - serial poll, untalk on MLA
L3 Basic listener - unlisten on MTA
SR1 Service request - full
DC1 Device clear - full
C4 Respond to SRQ
E1 Open Collector drivers
RL1 Remote Local - full

These represent the minimum required to implement the IEEE 488.2 standard.

4.1.2 IEEE 488 Address

The IEEE 488 address of the DLS 50 can be set to any of the valid value as defined in
the IEEE 488.1 standard, which can be from 0 to 30. The address can be change by
using the front panel (see section 3.4) or remotely (see section 4.7.2).

4.1.3 The SRQ Line

The SRQ line, as defined by the IEEE 488.1 standard, is raised when the DLS 50 is
requesting service. Here are some examples of services that could raise SRQ:

• A message is available in the output buffer

• An error occurred

• All pending operations are completed

• The power was just turned on

Remote Control

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In order to use the SRQ line, all relevant enable bits must be set, for example:

q The SRQ line can be raised automatically when there is a message

available by enabling the MAV bit in the Status Byte Register with *SRE
16

q The SRQ line can be raised automatically when there is an error by

enabling the ESB bit in the Status Byte Register with *SRE 32 and by
enabling the error bits in the Standard Event Status Register with *ESE 60
(32+16+8+4).

NOTE: The Factory default is to clear all enable registers on power up. See *PSC,

*ESE and *SRE commands for more details.

We recommend that you set the DLS 50 to raise the SRQ line when there is a message
available and when there is an error. The control program should follow those steps:

• Set all the relevant enable bits (only done once)

• Send the message

• Wait for SRQ if using the IEEE 488 interface

• Read the status byte

• If MAV is set then read the response

• If ESB is set then read the standard event status register and take all the

relevant actions.

For example, to get the identification message with the IEEE 488 interface, do the
following:

• Transmit "*SRE 48" àenable MAV and ESB (needed only once)

• Transmit "*ESE 60" àenable all the error bits (needed only once)

• Transmit "*IDN?" àquery the identification message

• Wait for SRQ to be raised

• Read the status byte àuse the IEEE 488.1 command, not *STB?

• If MAV is set read the response

• If ESB is set do the following àcheck if an error was detected

• Transmit "*ESR?" àquery the Event Status Register

• Wait for SRQ to be raised

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• If MAV is set read the response and take all the relevant action according to the

error type received

If desired, all the enable registers can be restored on power up with the *PSC command.

4.1.4 Resetting the DLS 50

To reset the DLS 50, use either the "Device Clear" command or the "Interface Clear"
line as defined in the IEEE 488.1 standard. This has the same effect as the power-up
reset.

4.1.5 Message Terminators

Messages to the DLS 50 must be terminated with either a Line Feed character (ASCII
<LF>, decimal 10, hex 0A), an IEEE 488.1 EOI signal or both. Messages from the DLS
50 are always terminated with a Line Feed character and the IEEE 488.1 EOI signal.

Note that some languages, including BASIC, may automatically append a carriage
return and a line feed at the end of messages. The carriage return character is not a
valid terminator, and will invalidate the last command.

The obvious solution is to send messages without carriage return. For example, in
BASIC, you can add a semi-colon ";" after any print to the IEEE 488 port. An alternate
solution is to append a semi-colon after the commands. This will make the DLS 50 see
the carriage return as a separate command, and discard it.

4.2 RS-232 Serial Interface

The DLS 50 uses a female DB-25 connector, and is configured as a DCE device.

To use the serial interface, simply connect your computer to the DLS 50 and set both the
computer and DLS 50 to the same protocol: baud rate, data format and flow control. Do
NOT use a null modem. The following sections give more details on the various
protocols.

The RS-232 serial interface can be set from the front panel (see section 3.4) or remotely
(see sections 4.7.3, 4.7.4 and 4.7.5) with either the serial or the IEEE 488 interfaces.

Remote Control

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4.2.1 Baud Rate

The DLS 50 supports the following baud rates:

300, 600, 1200, 2400, 4800, 9600, 19 200 and 38 400 bits per second.

The default is 9600 bps.

4.2.2 Data Format

The DLS 50 can use any of the following combinations of parity, character size, and
number of stop bits:

E71, O71, E72, O72, N72, E81, O81, N81 and N82

Where:

E = even parity
O = odd parity
N = no parity

the second digit is the character size

the third digit is the number of stop bits

The default value is N81.

4.2.3 Flow Control

The flow control allows the receivers to stop and to restart the data transmission in order
to prevent data loss.

Both the computer program and the DLS 50 must be set with the same flow control
selection. Note that some communication programs may only support some of the 5
flow control options that the DLS 50 has, and in some cases, the terminology may differ.

Remote Control

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4.2.3.1 "None" Flow Control

In most cases, there is no need for flow control because of the simplicity of the DLS 50.
The "None" flow control selection can be a valid choice if only one command at a time
is sent with some delay between them.

4.2.3.2 CTS Flow Control

When CTS flow control is selected, the DLS 50 lowers the CTS and the DSR lines when
it cannot accept data, and raises them when it can accept new characters.

This protocol controls the data flow in only one direction; from the computer to the DLS

50.

4.2.3.3 RTS/CTS Flow Control

When RTS/CTS flow control is selected, the DLS 50 stops transmitting data when the
RTS line is low, and restarts when the RTS line is high. The DLS 50 lowers the CTS
and the DSR lines when it cannot accept data, and raise them when it can.

This protocols controls the data flow in both directions. Note that the RTS line is not
the usual "Request To Send" as defined by the RS-232 standard.

4.2.3.4 XOn/XOff Flow Control

When XOn/XOff flow control is selected, the DLS 50 stops transmitting data when it
receives the XOff character (decimal 19, hex 13, ^S), and restarts when it receives the
XOn character (decimal 17, hex 11, ASCII ^Q). The DLS 50 will send XOff when it
cannot accept data and will send XOn when it can.

This protocol controls the data flow in both directions.

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4.2.3.5 "All" Flow Control

When "All" flow control is selected, the DLS 50 uses both the RTS/CTS and the
XOn/XOff flow control.

This protocol controls the data flow in both directions.

4.2.4 Message Terminators

Any message sent to the DLS 50 through the serial interface MUST be terminated with
the line feed character (decimal 10, hex 0A, LF). To ensure that no characters were left
in the receive buffer of the DLS 50 from an old, incomplete command, you can send the
line feed character by itself before sending new commands. Messages from the DLS 50
are always terminated with a Line Feed character.

Note that some languages, including BASIC, may automatically append a carriage
return and a line feed at the end of messages. The carriage return character is not a
valid terminator, and will invalidate the last command.

The obvious solution is to send messages without carriage return. For example, in
BASIC, you can add a semi-colon ";" after any print to the IEEE 488 port. An alternate
solution is to append a semi-colon after the commands. This will make the DLS 50 see
the carriage return as a separate command, and discard it.

4.3 Data formats

The DLS 50 adheres to the IEEE 488.2 principle of Forgiving Listening and Precise
Talking.

The DLS 50 can accept data in the <NRf> format, which means that numbers can be
made of a combination of digits, signs, decimal point, exponent, multiplier, unit and
spaces. For example, any of the following are valid representation for 12000 feet: 12kft,

12.0 kft, 12000, .12e2k, 1.2 e4 ft, +12000. If a unit is appended to a number, it must be
valid in the current context. Note that the period separates the decimal part of a
number.

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Within this framework, the data formats supported by the DLS 50 are:

Listening: a) <NRf> Decimal Numeric Program Data

Talking: a) <NR1> Numeric Response Data - Integer

b) Arbitrary ASCII Response Data

<NRf> is the Flexible Numeric Representation (just about any number representation)
defined in the IEEE.2 standard, <NR1> is an implicit point representation of a numeric

value (an integer number). Arbitrary ASCII Response Data is a generic character string
without any delimiting characters. It is usually used to send data in response to a query,
such as with the *IDN? command (see section 4.6, "IEEE 488.2 Common Command
Set").

4.4 Command Syntax

The DLS 50 adheres to the IEEE 488.2 format for command syntax. As with the Data
Format, the principle is forgiving listening and precise talking.

Commands may take one of two forms, either a Common Command or a Device
Dependent Command. The format of each is detailed in subsequent sections (4.6 and 4.7
respectively). Each type may be preceded by one or more spaces, and each must have
one or more spaces between its mnemonic and the data associated with it.

Common commands are preceded by *. Device Dependent commands are preceded by a
colon, with a colon separating each level of the command. Commands may be either in
upper or lower case. Multiple commands may be concatenated by separating each
command by semi-colons.

The following are some examples :

*RST
*RST;*WAI;:SET:CHANNEL:LENGTH 10kft
*ESE 45; *SRE 16

IEEE 488 messages to the DLS 50 may be terminated with either a Line Feed character
(ASCII <LF>, decimal 10, hex 0A), an IEEE 488 EOI signal or both. RS-232 messages

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must be terminated with a line feed character. Messages from the DLS 50 are always
terminated with a Line Feed character, and also with the EOI signal if using the IEEE
488 interface.

As defined in the SCPI specifications, a Device Dependent Command may be sent in its
short form or long form. The following commands are therefore identical in operation:

:SET:CHANNEL:LENGTH 9.0 kft
:SET:CHAN:LEN 9.0 kft
:SET:chan:LENGTH 9.0 kft

Queries of the system follow the same format as the commands, except that the data
normally associated with a command is replaced by a question mark "?". Following
receipt of such a command, the DLS 50 will place the appropriate response on the
output queue, where it can be read by the controller.

Examples are:

*IDN?
*ESE?;*SRE?
:SET:CHAN:LEN?

When a command does not begin with a colon, the DLS 50 assumes that the command
is at the same level as the previous command. For example, to set the serial interface,
one does need to specify `:SYStem:COMMunicate:SERial' each time, such as in:

:SYStem:COMMunicate:SERial:BAUD 9600;PACE CTS
FORMAT N81

This shorter form is valid because BAUD, PACE and FORMAT are at the same level.

4.5 Status Reporting

There are two registers that record and report the system status, the Status Byte
Register (STB), and the Event Status Register (ESR).

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For both registers there are three basic commands: one to read the register, one to set the
enabling bits, and one to read the enabling bits.

Status Byte Register Event Status Register
Read Register *STB? *ESR?
Set Enabling Bits *SRE <NRf> *ESE <NRf>
Read Enabling Bits *SRE? *ESE?

Where <NRf> is the new value of the register.

4.5.1 Status Byte Register (STB)

The bits of this register are mapped as follows :

bit 4: MAV (Message Available Bit)

Indicates that the Output Queue is not empty. If MAV goes high and is
enabled then MSS goes high.

bit 5: ESB (Event Status Bit)

It indicates that at least one bit of the Event Status Register is non zero and
enabled. If ESB goes high and is enabled then MSS goes high.

bit 6: MSS/RQS (Master Summary Status/Request Service)

MSS is raised when either MAV or ESB are raised and enabled. When the
status of MSS changes, the whole Status Byte Register is copied into the Status
Byte of the GPIB controller, where bit 6 is called RQS. When RQS goes high
so does the SRQ line, and in response to an IEEE 488.1 Serial Poll command,
both are cleared.

RQS and SRQ are defined by the IEEE 488.1 standard and are hardware
related. MSS summarizes all the status bits of the DLS 50, as defined by the
IEEE 488.2 standard.

bits 7, 3, 2, 1,and 0 are not used by the DLS 50.

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4.5.2 Event Status Register (ESR)

The Event Status Register monitors events within the system and reports on those
enabled. It records transitory events as well. The DLS 50 implements only the IEEE

488.2 Standard Event Status Register (ESR). It is defined as:

bit 0 Operation Complete. This bit is set in response to the *OPC command when

the current operation is complete.

bit 1 Request Control. The DLS 50 does not have the ability to control the IEEE bus,

and so this bit is always 0.

bit 2 Query Error. There was an attempt to read an empty output queue or there was

an output queue overflow. (maximum output queue capacity is 50 bytes).

bit 3 Device Dependent Error. At this time there are no device dependent errors in

the DLS 50, so this bit is always 0.

bit 4 Execution Error. The data associated with a command was out of range.

bit 5 Command Error. Either a syntax error (order of command words) or a semantic

error (spelling of command words) has occurred. A GET (Group Execute
Trigger) or *TRG command will also set this bit.

bit 6 User Request. Indicates that the user has activated a Device Defined control

through the front panel. Not used, so this bit is always 0.

bit 7 Power on. This bit is set when the DLS 50 is turn on. Sending *ESR? clears

the bit and stay cleared until the power is turned on again.

The setting of the Event Status Register can be read with the Event Status Register query
command (*ESR?). This will put the value of the register in the output queue, AND
will clear the register.

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4.6 Common Command Set

As specified in the IEEE 488.2 standard, a number of common commands are required
to set up and control of standard functions of remote controlled devices. These common
commands are as follow:

*CLS CLEAR STATUS COMMAND

Type: Status command
Function: Clears the Event Status Register (ESR). Clearing the Event Status

Register will also clear ESB, the bit 5 of the Status Byte Register
(STB). It has no effect on the output queue (bit 4 of the STB).

*ESE <NRF> EVENT STATUS ENABLE

Type: Status command
Function: Sets the Event Status Enable Register (ESER) using an integer value

from 0 to 255, representing a sum of the bits in the following bit map:

Bit: 76543210

1 = Operation Complete
1 = Request Control (not used)
1 = Query Error
1 = Device Dependant Error (not used)
1 = Execution Error
1 = Command Error
1 = User Request (not used)
1 = Power On

Bit 7 to 0 have a respective value of 128, 64, 32, 16, 8, 4, 2 and 1. For example if bit 3
and 5 are set then the integer value is 40 (8+32).

The ESER masks which bits will be enabled in the Event Status Register (ESR).

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On power-on, the register is cleared if the Power-on Status Clear bit is 1, or restored if
the bit is 0 (see *PSC for more details).

*ESE? EVENT STATUS ENABLE QUERY

Type: Status command
Function: An integer value between 0 and 255 representing the value of the

Event Status Enable Register (ESER) is placed in the output queue.
The possible values are described in the *ESE command section.

*ESR? EVENT STATUS REGISTER QUERY

Type: Status command
Function: An integer value between 0 and 255 representing the value of the

Event Status Register (ESR) is placed in the output queue. Once the
value is placed in the output queue, the register is cleared. The
possible values are described in the *ESE command section.

*IDN? IDENTIFICATION QUERY

Type: System command
Function: Returns the ID of the unit. Upon receiving this command the DLS 50

will put into the output queue the following string:

DLSTESTWORKS LTD, DLS 50 <Gauge>- <MaxLen
Unit>,<SN>,<Ver>
where:
<Gauge> is the gauge installed in the unit
<MaxLen Unit> is the maximum length supported by the DLS 50,

followed by the unit of the length
<SN> is the serial number of the unit
<Ver> is the revision level of the control firmware (always

2 digits)

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*OPC OPERATION COMPLETE

Type: Synchronization command
Function: Indicates to the controller when the current operation is complete.

This command will cause the DLS 50 to set bit 0 in the Event Status
Register (ESR) when all pending operations are completed. The bit is
read with the *ESR? command, which also clear the bit.
Communication can proceed as normal after this command, but be
prepare to receive SRQ at any time. See section 4.8 "DLS 50
Synchronization" for more details.

*OPC? OPERATION COMPLETE QUERY

Type: Synchronization command
Function: Indicates when the current operation is complete. This will cause the

DLS 50 to put an ASCII 1 (decimal 49, hex 31) in the output queue
when the current operation is complete. Communication can proceed
as normal after this command, but be prepare to receive the "1" at any
time. See the section 4.8 "DLS 50 Synchronization" for more details.

*PSC <NRF> POWER-ON STATUS CLEAR

Type: Status and event command
Function: Indicates if the unit should clear the Service Request Enable Register

and the Standard Event Status Register at power-on. If 1 (or higher)
then all the enable registers are cleared at power-on, if 0 then all the
enable registers are restored from the non-volatile RAM at power-on.
The factory default is 1 (clear all the enable registers). Any change to
the "Power-on Status" is saved in non-volatile RAM, and is always
restored on power up.

*PSC? POWER-ON STATUS CLEAR QUERY

Type: Status and event command
Function: Return the Power-on Status Clear value. If 1 then all the enable

registers are cleared at power-on, if 0 then all the enable registers are

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restored from the non-volatile RAM at power-on. The factory default
is 1 (clear all the enable registers).

*RST RESET

Type: Internal command
Function: IEEE 488.2 level 3 reset. This command will set the length of the

DLS 50 to 0 kft (or 0 km), and cancel any pending *OPC operation. It
will not affect the output buffer or other system settings of the unit.
Note that this is NOT equivalent to the power-up reset and the IEEE
488 "Device Clear".

*SRE <NRF> SERVICE REQUEST ENABLE

Type: Status command
Function: Sets the Service Request Enable Register (SRER). An integer value

indicates which service is enabled, with the following bit map:

Bit: 76543210

Not used, should always be 0

1 = Enable Message Available bit (MAV)

1 = Enable Event Status bit (ESB)

don’t care, MSS is always enabled

not used, should always be 0

Bit 7 to 0 have a respective value of 128, 64, 32, 16, 8, 4, 2 and 1. For
example if bit 4 and 5 are set then the integer value is 48 (16+32).

Note that if both MAV and ESB are disabled, then the bits MSS and
RQS and the line SRQ are never going to be raised (see section 4.5.1
for more details).

On power-on, this register is cleared if the Power-on Status Clear bit is
1, or restored if the bit is 0 (see *PSC for more details).

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*SRE? SERVICE REQUEST ENABLE QUERY

Type: Status command
Function: An integer value representing the value of the Service Request Enable

Register is placed in the output queue. The possible values are listed
in the *SRE command section.

*STB? STATUS BYTE QUERY

Type: Status command
Function: The value of the Status Byte Register is put into the output queue.

Contrary to the "*ESR?" command, this register is not cleared by
reading it. The register will be zero only when all its related structures
are cleared, namely the Event Status Register (ESR) and the output
queue.

Bit: 76543210

Not used, should always be 0

MAV: Message Available bit

ESB: Event Status Bit

MSS: Master Summary Status bit

Not used, should always be 0

Bit 7 to 0 have a respective value of 128, 64, 32, 16, 8, 4, 2 and 1. For
example if bit 4 and 5 are set then the integer value is 48 (16+32).

Note that bit 6 is MSS, which does not necessarily have the same value
as RQS (see section 4.5.1 for more details).

*TRG TRIGGER

Type: Trigger command
Function: Trigger operation of the device. Since the DLS 50 has no functions

that can be triggered this command has no effect on the operation of
the unit.

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*TST? SELF-TEST QUERY

Type: Internal command
Function: Returns the results of the self-test done at power up. The number

returned has the following bit map:

Bit: 76543210

0 = passed micro-controller test

0 = passed non-volatile RAM test

0 = passed dip switch test

0 = passed EPROM test

0 = can do wireline self-test

0 = passed wireline test

0 = not used, always 0

Bit 7 to 0 have a respective value of 128, 64, 32, 16, 8, 4, 2 and 1. For
example if bit 3 and 5 are set then the integer value is 40 (8+32).

*WAI WAIT TO CONTINUE

Type: Synchronization command
Function: Used to delay execution of commands. The DLS 50 will ensure that

all commands received before "*WAI" are completed before
processing any new commands. This means that all further
communication with the DLS 50 will be frozen until all pending
operations are completed. See section 4.8 "DLS 50 Synchronization"
for more details.

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4.7 Device Dependent Command Set

As recommended by the SCPI consortium and to stay consistent with the more
sophisticated DLS TestWorks simulators, the DLS 50 uses the following tree structure:

:SETting

:CHANnel

:LENgth <NRf>

:SYSTem

:COMMunicate

:GPIB

:ADDRess <0..30>

:SERial

:BAUD 300 | 600 | 1200 | 2400 | 4800 | 9600 | 19200 | 38400
:FORMat E71 | O71 | E72 | O72 | N72 | E81 | O81 | N81 | N82
:PACE NONE | CTS | RTS/CTS | XON/XOFF | ALL

Each section of the command may be sent in the full or the truncated form (indicated in
upper case). The command itself may be sent in upper or lower case form.

The DLS 50 will round any number to the nearest number permitted by the resolution of
the parameter.

Sections 4.3 and 4.4 give more information on the data format and the command syntax.

4.7.1 :SETting:CHANnel:LENgth <NRf>

Set the length of the simulated wireline channel, where <NRf> is the length ranging
from 0 to the maximum length (the maximum value depends on the DLS 50 model).
For example, to set the length of the simulated wireline to 8.5 kft, send:

:SET:CHAN:LEN 8.5 kft

The units of the length are optional, but they must match your DLS 50 model units.

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To query the length currently simulated by the DLS 50 send:

:SET:CHAN:LEN?

The command will return an integer number ranging from 0 to the maximum length
followed by the units. For example, if the length of the wireline is 8.5 kft, the return
message will be:

8500 FT

4.7.2 :SYStem:COMMunicate:GPIB:ADDRess <NRf>

Set the address of the IEEE 488.1 interface, where <NRf> is the address ranging from 0
to 30. For example, to set the address to 13, send:

:SYS:COMM:GPIB:ADDR 13

Note that the new address must be used immediately for any further IEEE 488
communication.

To query the current address send:

:SYS:COMM:GPIB:ADDR?

The command will return an integer number ranging from 0 to 30. For example, if the
address is 13, the return message will be:

13

4.7.3 :SYStem:COMMunicate:SERial:BAUD <NRf>

Set the receiver and transmitter baud rate of the serial interface, where <NRf> is any of
the following choices:

300 | 600 | 1200 | 2400 | 4800 | 9600 | 19200 | 38400

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For example, to set the baud rate to 9600 bit per second, send:

:SYS:COMM:SER:BAUD 9600 bps

The units are optional, but they must be "bps" if used.

Note that the new baud rate must be used immediately for any further serial
communication.

To query the current baud rate send:

:SYS:COMM:SER:BAUD?

The command will return the baud rate as an integer number. For example, if the baud
rate is 9600 bps, the return message will be:

9600

4.7.4 :SYStem:COMMunicate:SERial:FORMat <format>

Set the receiver and transmitter data format of the serial interface, where <format> is
any of the following choices:

E71 | O71 | E72 | O72 | N72 | E81 | O81 | N81 | N82

Where:

E = even parity
O = odd parity
N = no parity

the second digit is the character size

the third digit is the number of stop bits

For example, to set the data format to no parity, 8 bit per character, 1 stop bit, send:

:SYS:COMM:SER:FORMAT N81

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Note that the new data format must be used immediately for any further serial
communication.

To query the current data format send:

:SYS:COMM:SER:FORMAT?

The command will return the data format as a 3 character string. For example, if the
data format is no parity, 8 bit per character, 1 stop bit, the returned message will be:

N81

In order to simplify the setting of the serial interface, we have slightly modified the
command set as specified by the SCPI standard. The SCPI standard requires separate
settings for parity, character size, and number of stop bits. The DLS 50 combines the
three settings.

4.7.5 :SYStem:COMMunicate:SERial:PACE <pace>

Set the receiver and transmitter pace method (flow control) of the serial interface, where
<pace> is any of the following choices:

NONE | CTS | RTS/CTS | XON/XOFF | ALL

For example, to set the pace method to RTS/CTS, send:

:SYS:COMM:SER:PACE RTS/CTS

Note that the new pacing must be used immediately for any further serial
communication.

To query the current pacing method send:

:SYS:COMM:SER:PACE?

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The command will return the pacing method as a string. For example, if the pacing
method is RTS/CTS, the returned message will be:

RTS/CTS

To simplify the setting of the serial interface, we used a slightly modified SCPI
command set. The SCPI standard requires separate settings for the RTS/CTS flow
control and XOn/XOff pacing, and differentiates between the receive and the transmit
sides. The command set of the DLS 50 combines the ":RTS" and the "XON" settings
into one ":PACE" command.

Note that the SCPI standard assumes a DTE configuration, whereas the DLS 50 is
configured as a DCE port (thus not requiring a Null Modem).

4.8 DLS 50 Synchronization

The program controlling the DLS 50 can use three different commands to synchronize
with the DLS 50: *OPC, *OPC? and *WAI. Following are the main differences:

Set
Operation
Complete
bit when
Done

Return "1"
when
operation
complete

Raise SRQ
when
operation
complete

Block
comm. with
the DLS 50

Required
Enable
Bit(s)

*OPC Yes No Yes (1) No Operation

Complete,

ESB
*OPC? No Yes Yes (2) No MAV
*WAI No No No Yes none

(1) if "Operation Complete" and ESB are enabled
(2) if MAV is enabled

The main difference between OPC and WAI is that WAI will block any further
communication with the DLS 50 until all pending operations are completed. The main

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difference between *OPC and *OPC? is that *OPC set the "Operation Complete" bit,
and
*OPC? will return an ASCII "1" when all pending operations are completed. Make sure
that all the required enable bits are set.

When using *OPC or *OPC?, the program controlling the DLS 50 can determine when
the operation is completed by waiting for SRQ, or by reading the status byte with the
serial poll or with *STB? (if corresponding bits are enabled).

If the program uses the *OPC? command and then sends more queries, the program
must be ready to receive the "1" concatenated to other responses at any time.

When using *WAI, the communication time out should be set long enough to avoid
losing data (the DLS 50 needs approximately 200 ms to set a length).

4.9 References

The following references give more information on the IEEE 488 interface:

• ANSI/IEEE 488.1-1987, IEEE Standard Digital Interface for Programmable

Instrumentation (The Institute of Electrical and Electronics Engineers, Inc. 345
East 47th Street, New York, NY 10017-2394, USA)

• IEEE 488.2-1992, IEEE Standard Codes, Formats, Protocols, and Common

Commands (The Institute of Electrical and Electronics Engineers, Inc. 345 East
47th Street, New York, NY 10017-2394, USA)

• SCPI Standard Commands for Programmable Instruments, available from some

interface controller manufacturers (SCPI Consortium, 8380 Hercules Drive, Suite
P.S., La Mesa, CA 91942, Phone: [phone], Fax: [phone])

Warranty

Page 36

5. WARRANTY

DLS TestWorks warrants all equipment bearing its nameplate to be free from defects in
workmanship and materials, during normal use and service, for a period of twelve (12)
months from the date of shipment.

In the event that a defect in any such equipment arises within the warranty period, it shall be
the responsibility of the customer to return the equipment by prepaid transportation to a DLS
TestWorks service centre prior to the expiration of the warranty period for the purpose of
allowing DLS TestWorks to inspect and repair the equipment.

If inspection by DLS TestWorks discloses a defect in workmanship or material it shall, at its
option, repair or replace the equipment without cost to the customer, and return it to the
customer by the least expensive mode of transportation, the cost of which shall be prepaid by
DLS TestWorks.

In no event shall this warranty apply to equipment which has been modified without the
written authorization of DLS TestWorks, or which has been subjected to abuse, neglect,
accident or improper application. If inspection by DLS TestWorks discloses that the repairs
required to be made on the equipment are not covered by this warranty, the regular repair
charges shall apply to any repairs made to the equipment.

If warranty service becomes necessary, the customer must contact DLS TestWorks to obtain a
return authorization number and shipping instructions:

Or your local DLS TestWorks representative

Consultronics (Europe)

Unit A

Omega Enterprise Park

Electron Way, Chandlers Ford

Hampshire, England

SO5 3SE

Telephone: [phone]

Fax: [phone]

DLS TestWorks

169 Colonnade Road

Nepean, Ontario, Canada

K2E 7J4

Telephone: [phone]

Fax: [phone]

Toll Free: 1-800-465-1796

Warranty

Page 37

This warranty constitutes the only warranty applicable to the equipment sold by DLS
TestWorks and no other warranty or condition, statutory or otherwise, expressed or implied,
shall be imposed upon DLS TestWorks nor shall any representation made by any person,
including a representation by a representative or agent of DLS TestWorks, be effective to
extend the warranty coverage provided herein.

In no event (including, but not limited to the negligence of DLS TestWorks, its agents or
employees) shall DLS TestWorks be liable for special consequential damages or damages
arising from the loss of use of the equipment, and on the expiration of the warranty period all
liability of DLS TestWorks whatsoever in connection with the equipment shall terminate.

Shipping

Page 38

6. SHIPPING THE DLS 50

To prepare the DLS 50 for shipment, turn the power off and disconnect all cables,
including the power cable, and pack the simulator in the original carton. Do not place
any cables or accessories directly against the front panel as this may scratch the surface
of the display. We suggest that you mark all shipments with labels indicating that the
contents are fragile.

If sending back a unit to the factory, ensure that the return authorization number given
by our customer service department is shown on the outside.

Specifications

Page 39

7. SPECIFICATIONS

The DLS 50 is a two wire cable simulator. The user can select the simulated cable
length using the keys on front panel, or via the IEEE 488 or the RS-232 interface. The
length can vary from 0 to the maximum installed length, in steps of 100 ft or 50 m.

Simulated Cable Type and Maximum Length:

The following table shows the various configuration available at this time:

Standard DLS 50 Extended DLS 50

24 AWG, 12 kft 24 AWG, 20 kft
26 AWG, 12 kft 26 AWG, 20 kft

0.4 mm PE, 3.6 km 0.4 mm PE, 6.0 km

0.6 mm German, 3.6 km 0.6 mm German, 6.0 km

The gauge and the length must be specified at the time of order.

Frequency:

The maximum frequency simulated is 500 kHz.

Accuracy:

The attenuation accuracy is within ±?5% ±0.2 dB of the response of an ideal cable in the
10 kHz to 50 kHz frequency range, ±4% ±0.2 dB from 50 kHz to 300 kHz and ±8% ±0.2
dB from 300 kHz to 500 kHz.
The phase, characteristic impedance and signal delay accuracy are all within 5%.

DC Characteristics

100 mA, 300 Vpeak-to-peak across tip & ring

Specifications

Page 40

IEEE 488 Remote Control:

The unit can be controlled via an IEEE 488 interface. The unit supports the following
functions:

a) Listener
b) Talker
c) Local Lockout
d) Serial Poll
e) Selective Device Reset
f) Bus Reset
g) Primary Addressing from 0 to 30

RS-232 Remote Control:

The unit can be controlled via a RS-232 serial interface. The unit supports the following
functions:

Baud Rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400

Data Format: E71, O71, E72, O72, N72, E81, O81, N81 and N82

Where:

E = even parity
O = odd parity
N = no parity

the second digit is the character size

the third digit is the number of stop bits

Flow Control: None, CTS, RTS/CTS, XOn/XOff, All

Connections:

2 (one per terminal) 8 way RJ-45 connectors at the front and back. Also two 2 pole
terminal strips and an extra set of RJ-45 connectors at the back. All connectors are in
parallel.

Specifications

Page 41

Options:

(1) Rack mount kit
(2) Extended version
(3) Ziatech IEEE 488 interface card
(4) IEEE 488 shielded cable

7.1 ELECTRICAL

7.1.1 AC Power

Rated Input Voltage: 100-240VAC(±10%).
Rated Frequency: 50-60Hz.
Rated Power consumption: 30VA max.
Line Fuses: Type "T" 0.25A/250V SLOW BLOW (2 required,

5mm x 20mm).

7.2 ENVIRONMENTAL

Operating Temperature: +10°C to +40°C.
Storage Temperature: +10°C to +40°C.
Humidity: 90% (non-condensing) max.

7.3 MECHANICAL

Weight: 4.5Kg, 10 lbs
Dimensions: 42mm x 429mm x 366mm (H x W x D).

1¾" x 17" x 15"(1U height.)

7.4 OPERATING CONDITIONS

In order for the unit to operate correctly and safely, it must be adequately ventilated.
The DLS 50 contains ventilation holes for cooling. Do not install the equipment in any
location where the ventilation is blocked. For optimum performance, the equipment
must be operated in a location that provides at least ½" (10 mm) of clearance from the

Specifications

Page 42

ventilation holes. Blocking the air circulation around the equipment may cause the
equipment to overheat, compromising its reliability.

Safety

Page 43

8. SAFETY

8.1 INFORMATION

8.1.1 Protective Grounding (Earthing)

This unit consists of an exposed metal chassis that is connected directly to ground
(earth) via a power cord. The symbol used to indicate a protective grounding conductor
terminal in the equipment is shown in this section under "symbols".

8.1.2 Before Operating the Unit

q Inspect the equipment for any signs of damage, and read this manual thoroughly.
q Become familiar with all safety symbols and instructions in this manual to ensure

that the equipment is used and maintained safely.

WARNING: To avoid risk of injury or death, ALWAYS observe the following
precautions before operating the unit:

q Use only a power supply cord with a protective grounding terminal.
q Connect the power supply cord only to a power outlet equipped with with a

protective earth contact. Never connect to an extension cord that is not equipped
with this feature.

q Do not willfully interrupt the protective earth connection.

8.1.3 Supply Power Requirements

The unit can operate from any single phase AC power source that supplies between
100V and 240V (±10%) at a frequency range of 50 Hz to 60 Hz. For more information,
see the specifications section of this manual.

WARNING: To avoid electrical shock, do not operate the equipment if it shows any
sign of damage to any portion of its exterior surface, such as the outer casting or panels.

Safety

Page 44

8.1.4 Mains Fuse Type

The fuse type used is specified in the specifications section of this manual.

8.1.5 Connections to a Power Supply

In accordance with international safety standards, the unit uses a three-wire power
supply cord. When connected to an appropriate AC power receptacle, this cord grounds
the equipment chassis.

8.1.6 Operating Environment

To prevent potential fire or shock hazard, do not expose the equipment to any source of
excessive moisture.

8.1.7 Class of Equipment

The unit consists of an exposed metal chassis that is connected directly to earth via the
power supply cord. In accordance with the HARMONIZED EUROPEAN STANDARD
EN 61010-1 1993, it is classified as a Safety Class I equipment .

8.2 INSTRUCTIONS

The following safety instructions must be observed whenever the unit is operated,
serviced or repaired. Failing to comply with any of these instructions or with any
precaution or warning contained in the Operating and Reference Manual is in direct
violation of the standards of design, manufacture and intended use of the equipment.

DLS TESTWORKS LTD. assumes no liability for the customers failure to comply with
any of these requirements.

Safety

Page 45

8.2.1 Before Operating the Unit

q Inspect the equipment for any signs of damage, and read the Operating and

Reference Manual thoroughly.

q Install the equipment as specified in the relevant section of this manual.
q Ensure that the equipment and any devices or cords connected to it are properly

grounded.

8.2.2 Operating the Unit

q Do not operate the equipment when its covers or panels have been removed.
q Do not interrupt the protective grounding connection. Any such action can lead to a

potential shock hazard that could result in serious personal injury.

q Do not operate equipment if an interruption to the protective grounding is

suspected. Ensure that the instrument remains inoperative.

q Use only the type of fuse specified.
q Do not use repaired fuses and avoid any situation that could short circuit the fuse
q Unless absolutely necessary, do not attempt to adjust or perform any maintenance or

repair procedure when the equipment is opened and connected to a power source at the
same time. Any such procedure should only be performed by qualified service
professional.

q Do not attempt any adjustment, maintenance or repair procedure to the equipment if

first aid is not accessible.

q Disconnect the power supply cord from the equipment before adding or removing

any components.

q Operating the equipment in the presence of flammable gases or fumes is extremely

hazardous.

q Do not perform any operating or maintenance procedure that is not described in the

Operating and Reference Manual or the Sevice Manual.

q Some of the equipment's capacitors may be charged even when the equipment is not

connected the power source.

Safety

Page 46

8.3 SYMBOLS

This symbol appears on the unit and has the following meaning:

FIG. 8.1 "PROTECTIVE GROUNDING CONDUCTOR TERMINAL"

Page 47

INDEX

*CLS...........................................................................................................................23

*ESE....................................................................................................15, 20, 21, 24, 25

*ESR....................................................................................................15, 21, 23, 25, 28

*IDN......................................................................................................... 15, 20, 21, 25

*OPC ...................................................................................................22, 25, 26, 34, 35

*PSC......................................................................................................... 15, 24, 26, 27

*RST..................................................................................................................... 20, 26

*SRE.........................................................................................................15, 20, 21, 27

*STB.........................................................................................................15, 21, 28, 35

*TRG....................................................................................................................23, 28

*TST...........................................................................................................................29

*WAI........................................................................................................ 20, 29, 34, 35

address........................................................................................................ 1, 11, 14, 31

ANSI.......................................................................................................................6, 35

Baud Rate..............................................................................................................16, 40

Common Command ..............................................................................................20, 23

connector.........................................................................................................3, 4, 9, 16

data format...........................................................................................11, 16, 30, 32, 33

default............................................................................................ 10, 11, 12, 15, 17, 26

Device Clear..........................................................................................................16, 26

Electrical.....................................................................................................................35

enable.............................................................................................................. 15, 26, 34

ESB................................................................................................15, 22, 23, 27, 28, 34

Event............................................................................ 15, 21, 22, 23, 24, 25, 26, 27, 28

fuse ............................................................................................................... 4, 7, 43, 44

fuses............................................................................................................................ 44

GPIB......................................................................................................... 13, 22, 30, 31

IEEE 488.1...............................................................................13, 14, 15, 16, 22, 31, 35

IEEE 488.2..................................................................... 2, 13, 14, 19, 20, 22, 23, 26, 35

Interface Clear.............................................................................................................16

ISDN................................................................................................................. 1, 2, 5, 6

LCD Contrast.............................................................................................................. 10

length................................................................. 2, 7, 8, 9, 10, 12, 25, 26, 30, 31, 35, 39

Page 48

MAV....................................................................................................15, 22, 27, 28, 34

Message Terminators.............................................................................................16, 19

MSS................................................................................................................ 22, 27, 28

NR1............................................................................................................................. 19

NRf .......................................................................................... 19, 21, 24, 26, 27, 30, 31

port ........................................................................................................... 13, 16, 19, 34

query.............................................................................................. 15, 20, 23, 31, 32, 33

References................................................................................................................... 35

Reset .....................................................................................................................26, 40

RQS................................................................................................................ 22, 27, 28

RS-232.............................................................................2, 4, 11, 13, 16, 18, 20, 39, 40

SAFETY .....................................................................................................................42

safety instructions ........................................................................................................43

SCPI...........................................................................................2, 13, 20, 30, 33, 34, 35

screen.................................................................................................. 7, 8, 9, 10, 11, 12

Self-Test..................................................................................................................7, 29

serial interface.......................................................... 4, 11, 16, 19, 21, 31, 32, 33, 34, 40

serial poll ..............................................................................................................14, 35

shipping ........................................................................................................................1

SRQ .........................................................................................14, 15, 22, 25, 27, 34, 35

Status Byte ...........................................................................................15, 21, 22, 23, 28

symbols .......................................................................................................................42

Synchronization ........................................................................................ 25, 26, 29, 34

terminal......................................................................................................... 2, 9, 40, 42

Voltage........................................................................................................................41

Warranty....................................................................................................................... 1

wireline...................................................................................... 2, 3, 7, 9, 12, 29, 30, 31