Solartron Mobrey 3595 4C User Manual

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3595 4C

PC to S-Net Interface

USER MANUAL

35952350

SOLARTRON MOBREY LIMITED

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GENERAL SAFETY PRECAUTIONS

The equipment described in this manual has been designed in accordance with EN61010 “Safety requirements for electrical equipment for measurement, control and laboratory use”, and has been supplied in a safe condition. To avoid injury to an operator or service technician the safety precautions given below, and throughout the manual, must be strictly adhered to whenever the equipment is operated, services or repaired. For specific safety details, please refer to the relevant sections within the manual .

The equipment is designed solely for electronic measurement and should be used for no other purpose. Solartron-Mobrey accepts no responsibility for accidents or damage resulting from failure to comply with these precautions.

GROUNDING

To minimise the hazard of electrical shock, it is essential that the equipment be connected to a protective ground whenever the power supply, measurement or control circuits are connected, even if the equipment is switched off.

The electronics unit must be connected to ground using the marked case stud before control or signal leads are connected. The ground connections must have a current rating of 25A.

AC SUPPLY

Never operate the equipment from a line voltage or frequency in excess of that specified. Otherwise, the insulation of internal components may break down and cause excessive leakage currents.

To allow the electronics unit to be isolated from the ac supply, the supply must be routed through a switch (or circuit breaker). The switch (or circuit breaker) must be within easy reach of the operator and must be clearly identified as the means of supply isolation. The maximum current drawn from the supply must be limited by a fuse or trip, to a maximum of 13A.

FUSES

Before switching on the equipment, check that the fuses accessible from the interior of the equipment are of the correct rating. The rating of the ac line fuse must be in accordance with the voltage of the ac supply.

Should any fuse continually blow, do not insert a fuse of a higher rating. Switch the equipment off, clearly label it “unserviceable” and inform a service technician.

EXPLOSIVE ATMOSPHERES

NEVER OPERATE the equipment, or any sensors connected to the equipment, in a potentially explosive atmosphere. It is NOT intrinsically safe and could possibly cause an explosition

Continued overleaf.

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SAFETY PRECAUTIONS

(continued from previous page)

SAFETY SYMBOLS

For the guidance and protection of the user, the following safety symbols appear on the equipment:

SYMBOL: MEANING:

NOTES, CAUTIONS AND WARNINGS

For the guidance and protection of the user, Notes, Cautions and Warnings appear throughout the manual. The significance of these are is as follows:

NOTES – highlight important information for the reader’s special attention CAUTIONS – guide the reader in avoiding damage to the equipment WARNINGS – guide the reader in avoiding a hazard that could cause injury or death.

AVOID UNSAFE EQUIPMENT

The equipment may be unsafe if any of the following statements apply:

• Equipment shows visible damage

• Equipment has failed to perform an intended operation

• Equipment has been subjected to prolonged storage under unfavourable

conditions

• Equipment has been subjected to severe physical stress.

If in any doubt as to the serviceability of the equipment, don’t use it. Get it properly checked out by a qualified service technician.

LIVE CONDUCTORS

When the equipment is connected to its’ supply, the opening of covers or removal of parts could expose live conductors. The equipment must be disconnected from all power and signal sources before it is opened for any adjustment, replacement, maintenance or repair. Adjustment, maintenance and repairs must be must be done by qualified personnel, who should refer to the Maintenance Manual.

DO NOT OPEN THE ELECTRONICS UNIT WHEN IT IS ENERGISED.

EQUIPMENT MODIFICATION

To avoid introducing safety hazards, never install non-standard parts in the equipment, or make any unauthorised modification. To maintain safety, always return the equipment to Solartron-Mobrey for service and repair.

Fault indicator. Refer to Operating Manual for detailed instructions of use.

Hazardous voltages.

35952350

About This Manual

The 3595 4C User Manual will help you to prepare and install the interface for operation. It will also guide you through the demonstration software, which accompanies the PCI card, and then explain with an example how to program the interface.

The relevant information on interconnecting the PC and IMP can be found in the 3595 Series IMP Installation Guide. For this reason, the information on IMP networks has been kept to a minimum.

If you’re not familiar with the IMP network and the 3595 4C Interface card, you are advised to read the complete manual.

If the 3595 4C Interface card is already installed, you can proceed straight to Chapter 3 which will guide you through the demonstration software.

If you are familiar with the 3595 4C Interface card and the demonstration software, you can proceed straight to Chapter 4 which deals with programming.

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3595 4C

PC to S-Net Interface

User Manual

PART ONE

Installation and Operating Instructions

for the 3595 4C Interface card

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3595 4C USER MANUAL

Part One Contents

Chapter 1 Introduction: the 3595 4C Interface and facilities

1.1 THE 3595 4C INTERFACE

1.2 INTERFACE ACCESSORIES

1.3 IMPVIEW SOFTWARE

1.4 INTERFACE FACILITIES

1.5 3595 4C TECHNICAL SPECIFICATIONS

Chapter 2 Preparing and Installing the 3595 4C Interface

2.1 INTRODUCTION

2.2 SELECTING ON-CARD S-NET TERMINATION

2.3 IMP POWER SUPPLY OPTIONS

2.4 INSTALLING THE 3595 4C INTERFACE CARD IN THE PC

2.5 CONNECTING THE 3595 4C INTERFACE CARD TO S-NET

2.6 CONNECTING AN EXTERNAL POWER SUPPLY

Chapter 3 Programming the 3595 4C Interface card

3.1 INTRODUCTION

3.2 ADDRESSING THE 4C INTERFACE CARD MEMORY

3.3 CONTROLLING IMP COMMUNICATION

3.4 INTERFACE CONTROL

3.5 RECEIVING IMP RESULTS AND RESPONSES

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3595 4C PC to S-Net Interface User Manual Part One

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1-1

Introduction: the 3595 4C

Interface and facilities

Contents

1.1 THE 3595 4C INTERFACE 1-2

1.1.1 PC System Requirements 1-2

1.2 INTERFACE ACCESSORIES 1-2

1.3 IMPVIEW SOFTWARE 1-2

1.4 INTERFACE FACILITIES 1-3

1.4.1 IMP Commands 1-3

1.4.2 IMP Data Streams 1-3

1.4.3 IMP Addresses 1-3

1.5 3595 4C TECHNICAL SPECIFICATIONS 1-4

The 3595 4C Interface

3595 4C User Manual Part One

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1.1 THE 3595 4C INTERFACE

The 3595 4C Interface card enables a PC, with PCI expansion slots, to communicate with the SolartronMobrey S-Net system. The card provides full timing control and error checking, in accordance with the S-Net communication protocol.

1.1.1 PC System Requirements

The 3595 4C Interface card is fully compatible with a PC that has:

• A free PCI expansion slot

• A minimum of 128K user memory

• Microsoft Windows (9x, 2000 or NT4)

1.2 INTERFACE ACCESSORIES

The 3595 4C Interface card is supplied with a variety of accessories:

• one 9-way D-type socket (P/N:352509060), to suit the external power connector.

• one 24 gauge S-Net cable/10m (P/N:35950203), with 9-way D-type plug to suit S-Net socket.

• one spare 9-way D-type plug (P/N:351309020) to suit the S-Net socket.

• two connector hoods (P/N:354006290).

• four screw locks, male (P/N:354005170).

• two S-Net terminators (P/N:35900222) for fitting in IMP (refer to the 3595 Series IMP Installation Guide).

• one CD-ROM (P/N:35955840) containing the software and manuals for many IMP products.

1.3 IMPVIEW SOFTWARE

IMPVIEW software is supplied on the CD-ROM that accompanies the 35954C Interface card. IMPVIEW

allows you to send commands to IMP devices, and to receive data from them.

The IMPVIEW installation process will also install a (32-bit) Microsoft Windows driver.

Please refer to the “3595 74A IMPVIEW” user manual for full information on installing and using this software.

Note: The PC memory address used by the PCI card is fixed at 0xC800. You can’t configure the card

to use a different address.

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1.4 INTERFACE FACILITIES

1.4.1 IMP Commands

The IMPVIEW software communicates with the 3595 Series IMP using commands in the form of character strings. For example, the reset command is RE.

A command may need to be made more specific by using it with a number. An example of this is the command CL2, which means: ‘clear event totalise counter on channel 2’.

Several commands may be sent in a command string. Each command in the string is separated from it’s neighbour by a semicolon. A simple example of a command string is ST;CL2. This particular command tells a digital IMP to return its’ status and then clear the event totalise counter on channel 2.

IMP commands and responses are dealt with in Part two of this manual.

1.4.2 IMP Data Streams

The 3595 Series IMP is able to return four types of data, each data type having an individual format. S-Net protocol segregates these data types and returns each type on it’s own data stream. This approach allows application software to categorise and attach different priorities to data types, thus improving the speed with which high priority data (such as event timing) is handled.

The data types conveyed by each stream are as follows:

Stream 0 Scanned measurements (series of channels), or long numeric responses

Stream 1 Single channel measurement, or short numeric responses

Stream 2 Event information (3595 2A and 3595 2B only)

Stream 3 Command responses, in ASCII characters. Typical examples of this data type are status

information or command confirmation.

1.4.3 IMP Addresses

Each 3595 Series IMP in the system must have a unique address. The IMP is assigned an address by a pair of rotary switches inside the IMP connector block. The procedure for setting these switches is as described the “3595 Series IMP Installation Guide”. The 3595 4C Interface card can handle up to 50 IMP devices, with addresses in the range of 1 to 50 inclusive.

The 3595 4C Interface

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1.5 3595 4C TECHNICAL SPECIFICATIONS

Connections:

124-way edge connector for PCI expansion slot bus.

9-way D-type female connector for S-Net.

9-way D-type male connector for external power.

Environment:

Temperature Operating 0°C to 55°C (50% Relative Humidity)

0°C to 45°C (95% Relative Humidity)

Storage -40°C to 70°C

Communication (S-Net) capability:

Maximum of 50 IMP devices

Maximum S-Net cable length of 1500m.

S-Net Power Supply capability:

Up to 5 IMP devices (3595 Series) can be supplied, at limited distances, from the PC internal power supply.

Up to 50 IMP devices (3595 Series) can be supplied from an external power supply. The actual number depends on the voltage of the external supply and on the length and gauge of the S-Net cable. (See the “3595 IMP Installation Guide” for details)

Power Drain (on PC):

5V, 2.5W maximum

12V, 50mW maximum plus 1.2W for each 3595 Series IMP, and 1.8W for each Universal Series IMP, when powered from the internal power supply

(Up to a maximum of 5 IMP devices).

Power Drain (from external power supply, if used):

1.2W maximum per IMP.

Requirements for external power supply, if used:

12 to 50V DC, dependent on system size and S-Net wire gauge.

Supply ripple less than 100mV rms.

Physical dimensions:

Overall length 6.8in. Overall height 4.2in. Overall width 0.8in. Overall weight 0.2kg/0.44lbs.

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2-1

Preparing and Installing

the 3595 4C Interface

Contents

2.1 INTRODUCTION 2-2

2.2 SELECTING ON-CARD S-NET TERMINATION 2-3

2.3 IMP POWER SUPPLY OPTIONS 2-4

2.4 INSTALLING THE 3595 4C INTERFACE CARD IN THE PC 2-5

2.5 CONNECTING THE 3595 4C INTERFACE CARD TO S-NET 2-7

2.5.1 S-Net cables 2-8

2.5.2 Cable selection 2-8

2.5.3 Cable selection for IMP devices using internal supply 2-9

2.5.4 Cable selection for IMP devices using external supply 2-9

2.6 CONNECTING AN EXTERNAL POWER SUPPLY 2-12

2.6.1 External power supply requirements 2-12

List of Figures

Figure 2.1: S-Net cable terminations ........................................................................................................................2-3

Figure 2.2: Location of S-Net termination Jumper J202 ...........................................................................................2-3

Figure 2.3: Location of external power supply Jumper J201 ....................................................................................2-4

Figure 2.4: PC expansion slots.................................................................................................................................2-5

Figure 2.5: Fitting the 4C Interface card retaining screw ..........................................................................................2-5

Figure 2.6: Location of S-Net connector on the Host PC rear panel......................................................................... 2-7

Figure 2.7: Minimum recommended wire gauge for a 24V external supply for: (a) Universal IMP and (b) Other…2-10

Figure 2.8: Minimum recommended wire gauge for a 48V external supply for: (a) Universal IMP and (b) Other ... 2-11

Figure 2.9: Location of the external power connector on the PC rear panel........................................................... 2-12

List of Tables

Table 2.1: S-Net Connections ..................................................................................................................................2-7

Table 2.2: Cables recommended for S-Net ..............................................................................................................2-8

Table 2.3: Maximum cable lengths for IMPs using 4C Interface card internal supply............................................... 2-9

Table 2.4: External Power Connector..................................................................................................................... 2-12

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2.1 INTRODUCTION

This chapter tells you how to set-up and install the 3595 4C Interface card. The information given here relates to card issue A and subsequent issues.

The steps to follow are:

Select the ‘on-card’ S-Net termination with Jumper J202. (See Section 2.2, Page 2-3.)

. Decide on the IMP power supply option. Your decision may affect the S-Net cable required and may

also make it necessary for you to remove link J201 on the Interface card. (See Section 2.3, Page 2-4.)

Install the 4C Interface card in the PC. (See Section 2.4, Page 2-5.)

Connect the 4C Interface card in the PC to S-Net. (See Section 2.5, Page 2-7.)

Where required, connect the 4C Interface card to an external power supply. (See Section 2.6, Page 2-12.)

PRECAUTIONS

Static Electricity

The 4C Interface card uses MOS (metal-oxide semiconductor) integrated circuits, which can be damaged by static electricity. Keep the card in the plastic packaging until it is needed for fitting. Do not touch the edge connectors. Handle the card only by the free edges.

High Voltages

Before opening the cabinet (base unit) of the PC, switch the power off and disconnect the supply lead from the mains power supply. Do not operate the PC with the cover removed.

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2.2 SELECTING ON-CARD S-NET TERMINATION

To avoid signal reflections, the S-Net cable must be correctly terminated at each end. The way in which this is achieved depends on how the cable is connected between Host PC and the IMP devices. Two basic arrangements are shown in Figure 2.1.

HOST PC IMP 1 IMP n

(S-Net terminated)

(S-Net In) (S-Net Out)

TERMINATOR

IMP n

(S-Net In) (S-Net Out)

TERMINATOR

IMP n

(S-Net Out) (S-Net In)

HOST PC

TERMINATOR

Figure 2.1: S-Net cable terminations

Where the Host PC is located at the end of S-Net (Figure 2.1a), the S-Net cable is terminated on-board the 4C Interface card. Here, connection between cable and terminator is made through ‘on-card’ Jumper J202 (See Figure 2.2). The other terminator is fitted to IMP S-Net terminals at the opposite end of the cable.

Where the Host PC is located between IMP devices (See Figure 2.1), the ‘on-card’ termination must be disconnected. To do this, carefully remove the link on Jumper J202. An S-Net cable terminator is then fitted to the IMP devices at both ends of the S-Net cable.

Figure 2.2: Location of S-Net termination Jumper J202

Two S-Net cable terminators for IMP devices are supplied with the 3595 4C Interface card. Instructions for fitting S-Net cables and cable terminators to an IMP are given in the “3595 Series IMP Installation Guide”.

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2.3 IMP POWER SUPPLY OPTIONS

IMP devices may be supplied with power from one of several sources:

a. From the internal power supply of the 3595 4C Interface card, via the S-Net cable. This supply can

provide 12V for the S-Net system.

b. From an external 12V – 50V power supply connected to the external power supply plug on the 4C

Interface card; again, via the S-Net cable. The location and pin numbering of the external power supply are detailed in Section 2.6, page 2-12. This supply allows up to 50 IMP devices to be operated with a maximum S-Net cable length of 1km.

The IMP power supply is automatically switched to the external source when a voltage of over 12V is applied to the external power plug on the 4C Interface card. Where the external source is to be used continuously, it is recommended that the ‘on-card’ Jumper J201 link is removed. (See Figure 2.3)

c. Directly from a power supply that is local to the IMP(s). For further information on this, refer to the

“3595 Series IMP Installation Guide”.

Each IMP consumes approximately 1W (1.2W at power-up). In some applications, the 3595 1D Analogue Output IMP can require more power. In this case, special consideration is needed. Refer to the “3595 Series IMP Installation Guide” for details.

Figure 2.3: Location of external power supply Jumper J201

SUPPLY CONSIDERATIONS FOR THE VIMP

A VIMP is powered from two sources: S-Net conveys power to the communications module, whilst a 3595 95D Power Supply, local to the VIMP, supplies power to the vibration measurement front end.

Depending on the total power required from S-Net, source a or source b (as described above) can be used to provide the power for the VIMP communications module.

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2.4 INSTALLING THE 3595 4C INTERFACE CARD IN THE PC

The procedure for installing the 3595 4C Interface card in the PC is as follows:

Set all power switches to ‘off’.

Unplug all cables from the mains power supply.

Disconnect all cabling from the rear end of the Host PC.

Remove the Host PC casing. If you require help in doing this, refer to a PC manual.

. Locate a free PCI expansion slot. (See Figure 2.4)

Figure 2.4: Various PC expansion slots

Remove the screw securing the cover of the PCI expansion slot in which the 4C Interface card is to be installed. Slide the cover out of the PC frame. Save the screw for securing the 4C Interface card.

Remove the 3595 4C Interface card from the protective cover. Check that the ‘on-card’ Jumpers are prepared as described in the earlier sections of this chapter.

Figure 2.5: Fitting the 4C Interface card retaining screw

AGP Slot

ISA Slots

PCI Slots

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Holding the card by the corners, press it firmly into the PCI expansion slot prepared in Step 6. Align the ‘U’ shaped slot in the card-retaining bracket with the hole in the rear panel of the PC. Fit the securing screw, which should be snug against the inside of the ‘U’. Tighten the screw. (See Figure 2.5.)

Refit the PC casing and retaining screws. (The is the reverse of actions taken during Step 4.)

10.

Refit all system cabling that was removed during Steps 2 and 3.

11.

Complete the installation by connecting the S-Net cable and external power supply (as required) as described in Section 2.5 (page 2-7) and Section 2.6 (page 2-12).

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2.5 CONNECTING THE 3595 4C INTERFACE CARD TO S-NET

The S-Net cable is connected to the Host PC through a D-type connector in the 4C Interface card.

Figure 2.6 shows the location of this connector when the card is already fitted in a PC. The pin functions of the S-Net connector as listed in Table 2.1.

Figure 2.6: Location of S-Net connector on the Host PC rear panel

Table 2.1: S-Net Connections

Pin Function

1, 2, 6 SHIELD

7, 8, 9 -ve S-Net line

3, 4, 5 +ve S-Net line

In applications where signals and IMP power are both delivered via the S-Net, it is important that the core of the S-Net cable is of adequate gauge. See Section 2.5.1 and 2.5.2 for details.

S-Net Connector

(9-way female D-type)

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2.5.1

S-Net cables

3595 Series IMP devices are linked to the 3595 4C Interface card by S-Net, a serial communications network. The S-Net cable consists of a twisted pair of multi-stranded wires with a screen around them, and has a nominal characteristic impedance of 100Ω. Non-screened cables may be used, but S-Net signals may be subject to interference in electrically ‘hostile’ environments. In most applications, signals and IMP power are delivered via the S-Net cable that is connected to a D-type connector on the 4C Interface card.

Table 2.2: Cables recommended for S-Net

Cable Gauge Brand Names Solartron Mobrey P/N

12 AWG Brand-Rex T12459 TBA

16 AWG Brand-Rex T12460, Alpha 9820, Belden 9860 TBA

18 AWG Brand-Rex CD8920251, Belden 9250 TBA

20 AWG

Brand-Rex BC 57207, Alpha 9818 Belden 9207, Belden 0915 (direct burial)

TBA

24 AWG Brand-Rex B156641, Alpha 2400, Belden 8641 TBA

Note:

Approximately 10 metres of 24 AWG Belden 8641 cable are provided with each module. This is sufficient for small data acquisition systems or for testing purposes.

The connections are: S-Net +ve = black (or red) and S-Net –ve = white.

2.5.2

Cable selection

Cable selection depends on two cable characteristics:

The a.c. attenuation of the cable. This affects the digital communications that are running back and forth along the cable, between the IMP devices and the 4C Interface card. There are two specific points to consider:

a. The high a.c. attenuation of the 24 AWG cable means that S-Net using this cable can not be longer

than 660 metres.

b. The low a.c. attenuation of the 14 and 18 AWG cables means that S-Net using these cables can

extend up 1.5km. The large diameter of these cables necessitates special consideration when making connections to the IMP. For details, see the “3595 Series IMP Installation Guide” or consult Solartron Mobrey.

The d.c. resistance of the cable. This, and the voltage of the power supply, determines the maximum number of IMP devices that can be powered via the cable. Generally, if any IMP devices on the network are powered from the 4C Interface card via the S-Net cable, it is important that a cable of adequate gauge is used. The optimum cable size depends on the number of IMP devices to be powered via the S-Net cable, the cable length and the power supply voltage. Guidance on choosing the cable, either for power provided internally from the 4C Interface card or from an external supply via the 4C Interface card, is given in Sections 2.5.3 and 2.5.4.

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2.5.3

Cable selection for IMP devices using internal supply

The internal power supply of the 4C Interface card can supply 12V to the S-Net system. For this, Table 2.3 shows the recommended maximum length for a given gauge of cable and number of IMP devices.

Note that Table 2.3 is based on an IBM PC with only the 3595 4C Interface card fitted. Therefore, the figures given may differ for other PCs. If additional cards using the 12V rail are fitted, the maximum number of IMP devices may decrease correspondingly.

Table 2.3: Maximum cable lengths for IMPs using 4C Interface card internal supply

Maximum Cable Length (Metres)

No. of IMP

devices

12 AWG

(3.4mm

)

16 AWG

(1.3mm2)

18 AWG

(0.8mm2)

20 AWG

(0.5mm2)

24 AWG

(0.2mm2)

1 725 410 225 135 50

2 345 160 100 60 20

3 230 105 65 40 10

4 175 80 50 30 10

5 140 60 40 25 10

2.5.4

Cable selection for IMP devices using external supply

When IMP devices are powered from an external power supply connected to the 4C Interface card, it is possible to use longer lengths of S-Net cable than those listed in Table 2.3. It is important, however, that the core of the cable is of adequate gauge. The actual gauge required depends on the number of IMP devices to be powered, their distribution along the cable and the power supply voltage.

To select a suitable wire gauge and supply voltage for a given system, refer to the cable selection graphs (Figure 2.7 and Figure 2.8). These graphs assume the worst case distribution of IMP devices, i.e. all of them grouped at the far end of the cable, and incorporate a safety factor.

As an example of using the cable selection graphs, assume that the supply voltage has been fixed at 24V and that 10 IMP devices are to be powered by the S-Net cable. The total cable length is expected to be around 300 metres. For a 24V supply, refer to Figure 2.7 and determine the point on the graph where ’10 IMPs’ and ‘0.3km’ intersect; in this case, the 16 AWG region. This is the smallest gauge of cable that can be used. Therefore, 16, 14 or 12 AWG cables are suitable.

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Figure 2.7: Minimum recommended wire gauge for a 24V external supply for:

(a) Universal IMP and (b) Other IMP

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Figure 2.8: Minimum recommended wire gauge for a 48V external supply for:

(a) Universal IMP and (b) Other IMP

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2.6 CONNECTING AN EXTERNAL POWER SUPPLY

IMP devices can be powered from an external power supply connected to the 3595 4C Interface card. This supplies power to IMP devices through S-Net in exactly the same way as the internal power supply. However, the extra capacity provided by the external supply allows up to 50 IMP devices to be operated with a maximum cable length of 1km.

With the ‘on-card’ Jumper J201 link fitted, the 4C Interface card switches from the internal supply to the external supply when the voltage of the external supply exceeds 12V. Should you wish to power IMP devices continuously from the external supply, the Jumper J201 link must be removed. (See Section 2.3)

The external power supply connection to the Host PC is made through a D-type connector on the 3595 4C Interface card. The location of this D-type connector is shown in Figure 2.9.

Figure 2.9: Location of the external power connector on the PC rear panel

Table 2.4: External Power Connector

Pin Function

6, 7, 8, 9 +ve 12059V, 1A max.

1, 2, 3, 4, 5 -ve

2.6.1

External power supply requirements

An external power source must fulfil the following requirements:

• Current limited to 1.5A - 5A, or protected by 5A fuse.

• Voltage 12V to 50V. This depends on the wire gauge, the cable length and the number of IMP devices

connected to the cable.

• Supply ripple of less than 100mV rms.

It is permissible for a battery-powered S-Net system to have a charger permanently connected. Batteries generally provide sufficient output smoothing. A battery-powered system must be protected by a fuse (~5A).

A suitable supply, the 3595 95A 48V System PSU, is available from Solartron-Mobrey.

External Power Connector

(9-way male D-type)

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Programming the 3595 4C

Interface card

Contents

3.1 INTRODUCTION 3-3

3.2 ADDRESSING THE 4C INTERFACE CARD MEMORY 3-3

3.2.1 Addressing the RAM locations 3-3

3.2.2 Restoring a previously selected RAM Page 3-5

3.3 CONTROLLING IMP COMMUNICATION 3-6

3.3.1 Initialising the system 3-7

3.3.2 Transmitting a command message 3-8

3.3.3 Receiving measurement results 3-8

3.3.4 Using interrupts 3-8

3.4 INTERFACE CONTROL 3-9

3.4.1 Interface Control Register 3-9

3.4.2 Extended error codes 3-10

3.4.3 Software status and issue 3-10

3.4.4 Flash Checksum registers 3-10

3.4.5 Real-time calendar and clock 3-11

3.4.6 Selecting IMP devices for polling 3-12

3.4.7 Selecting the RAM pages 3-13

3.4.8 Transmitting data to the IMP 3-13

3.4.9 Reading the received data status 3-15

3.4.10 Setting receive interrupts 3-16

3.5 RECEIVING IMP RESULTS AND RESPONSES 3-17

3.5.1 Data streams 3-17

3.5.2 Stream size 3-18

3.5.3 Stream time tags 3-18

3.5.4 Transmit retry count 3-19

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List of Figures

FIGURE 3.1: RAM PAGE ACCESS BY THE HOST PC 3-4

FIGURE 3.2: INTERFACE CONTROL REGISTER 3-9

FIGURE 3.3: REAL-TIME CALENDAR AND CLOCK 3-11

FIGURE 3.4: POLL TABLE 3-12

FIGURE 3.5: TRANSMIT REGISTER 3-13

FIGURE 3.6: RECEIVE TABLE 3-15

FIGURE 3.7: RECEIVE INTERRUPT TABLE 3-16

FIGURE 3.8: STREAM SIZE LOCATIONS 3-18

FIGURE 3.9: STREAM TIME TAG LOCATIONS 3-18

List of Tables

TABLE 3.1: CONTROL AND STATUS AREAS OF RAM PAGE 0 3-6

TABLE 3.2: BIT FUNCTIONS OF THE IC REGISTER 3-9

TABLE 3.3: FLASH CHECKSUM REGISTERS 3-10

TABLE 3.4: CONTENT OF RAM PAGES 2 THROUGH 51 3-17

TABLE 3.5: DATA-TO-STREAM ASSIGNMENTS 3-17

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3.1 INTRODUCTION

This chapter describes how the Host PC can be made to control IMP devices on S-Net by accessing a

64K

dual-port RAM

on the 3595 4C Interface card. The information is intended for users who wish to write their own software drivers: if your system uses Solartron-Mobrey software then the dual-port RAM is ‘transparent’ and you need not get involved with it.

3.2 ADDRESSING THE 4C INTERFACE CARD MEMORY

By accessing the 3595 4C Interface card memory, the Host PC is able to communicate with both the card and the IMP devices under it’s control.

Figure 3.1 shows how the 64K dual-port RAM is divided up into

512-byte pages

, each page dealing with a

particular aspect of IMP operation.

Communication control is managed through

RAM Page 0

. On this page, the Host PC controls such

elements as:

• IMP command transmission,

• The polling of IMP devices for data,

• measurement data and message reception, on the IMP data streams,

• real-time calendar and clock control of the 4C Interface card,

• S-Net power on/off.

IMP commands to be transmitted are written by the Host PC into

RAM Page 1

Measurement results from the IMP devices are received on

RAM Pages 2

through

, which are assigned

to IMP devices 1 through 50.

3.2.1 Addressing the RAM locations

The Host PC accesses the dual-port RAM of the 4C Interface card through the RAM page window (Figure 3.1). This window is

0x200

locations wide.

It resides at a

base address

that is always 0xC800

The width of the window allows it to encompass one complete RAM page. Initially, the page accessed is RAM Page 0. Any other page can be accessed from this by writing the appropriate page number into the page select location (byte) on RAM Page 0.

The address of the page select location (byte) is base address + 0xFF = 0xC8FF.

A return to RAM Page 0, from the page in use, is made by reading the page select location (byte). The data read is the actual data at this location (a measurement data byte on RAM Page 2 for example). On RAM Page 0, however, the page select byte contains the number of the page last visited. This number can be saved, should the page returned from need to be restored (See Section 3.2.2). Zero should be written into the page select byte to indicate that the RAM Page 0 is selected.

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Communication

Control

Page Select

RAM PAGE 0

512

Bytes

Base Address

+ 0x1FF

Base Address

Memory location address range for RAM page window

INPUT -

OUTPUT WINDOW OF HOST

256KBytes

RAM PAGE 1

IMP Commands

RAM PAGE 2

Measurement

Results: IMP 1

RAM PAGE 3

Measurement

Results: IMP 2

RAM PAGE 51

Measurement

Results: IMP 50

Page Select

Figure 3.1: RAM page access by the HOST PC

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3.2.2 Restoring a previously selected RAM Page

In a multi-tasking application, it may be necessary to restore a RAM page from, say, ‘Task A’ on completion of, say, ‘Task B’. The routine for doing this is as follows:

Use Task B to read the page select byte on the page presently used by Task A

Read the page select byte again. This will contain the number of the page used by Task A

Save this page number

Write zero to the page select byte, to indicate that RAM Page 0 is now selected. (Note: This ensures that RAM Page 0 will be restored for Task B, should it be interrupted whilst using Page 0)

On completion of Task B, select RAM Page 0 by reading the Page Select byte on the page in use.

Get the page number saved in step 3

Write this page number into the page select byte. The RAM Page previously selected for Task A is now restored.

During the above sequence, interrupts should be masked. This masking is to handle the period when RAM Page 0 is selected but the page select byte still contains the previous page number.

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3.3 CONTROLLING IMP COMMUNICATION

The Host PC controls IMP communication by accessing RAM Page 0. This page holds 512 bytes of control and status information for up to 50 IMP devices. Table 3.1 lists the control facilities on RAM Page 0 and the range of location addresses used for each one. The use of these facilities is described in Section 3.3.1. The bit functions are described in Section 3.4.

Table 3.1: Control and status areas of RAM Page 0

Location Addresses * Function

000 – 0C7 (r/w) Receive Table

0C8 – 0CE (r/w) Poll Table (Receive Enable)

0CF – 0E7 (r/w Receive Interrupt Table

0E8 – 0ED (r/w) Transmit Control Registers

0EE – 0F7 (r/w) Real-time Calendar and Clock

0F8 – 0FE (r/w) Reserved

0FF (r/w) Page Select

100 – 1FF (w) Interface Control Register

101 – 103 Reserved

102 Unallocated

103 Reserved

104 (r) Operating Mode

105 (r) Extended Error Codes

106 – 10F Unallocated

110 (r) Boot Software Status (in ASCII, e.g. ‘A’)

111 (r) Boot Software Status (in ASCII, e.g. ‘B’)

112 (r) Boot Software Status (in ASCII, e.g. ‘C’)

113 (r) Boot Software Status (in ASCII, e.g. ‘D’)

114 – 11F Reserved for extra software information

120 – 128 (r) Flash Checksum

129 – 140 Reserved

141 – 1FF Unallocated

To obtain the actual location addresses used, add these hexadecimal addresses to the base address

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3.3.1 Initialising the system

To initialise the system, the Host PC must set up:

• The INTERFACE CONTROL REGISTER (Section 3.4.1, Page 3-9). This provides for:

— powering-up S-Net (where IMP devices are powered from the 4C Interface card) and indirectly

resetting the IMP devices,

— resetting the 4C Interface card,

— reprogramming the 4C Interface card in-situ,

— reading an error code.

• The REAL-TIME CALENDAR AND CLOCK (Section 3.4.5, Page 3-11). Once this is done, the time is transmitted to all IMP devices on the S-Net once every second. This maintains the time in all IMP devices, accurate to within ±1ms of the time in the 4C Interface card.

• The POLL TABLE (Section 3.4.6, Page 3-12). In this table, a bit should be set for each IMP device from which data is required. Alternatively, the Poll Table may be set later, when reception is required.

The 4C Interface card can now be used to command the IMP devices on S-Net and receive from them. Sections 3.3.2 through 3.3.4 tell you how.

NOTE: Power-up Settling Delay

After power has been applied to the S-Net, the IMP devices take time to become operational. For 50V at the IMP, this time could be up to 1 second, whereas for 10V, it is up to 3 seconds. The voltages quoted are those actually at the IMP, not those applied to the S-Net at the Controller. The times quoted apply to IMP devices other than the Universal IMP (UIMP): for UIMP devices, the times should be doubled.

Setting poll bits before the power-up time has elapsed can result in poll errors being generated. Therefore, it is necessary to delay setting up the Poll Table by a time slightly in excess of the power-up time.

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3.3.2 Transmitting a command message

To make an IMP do something, the Host PC sends it a command message. This is loaded into RAM Page 1, which can hold up to 256 bytes. (Details of the IMP commands are given in Part 2 of this manual.)

To control message transmission, the Host PC uses the TRANSMIT REGISTERS (Section 3.4.8, Page 3-13). These allow the Host PC to:

• specify the number of bytes to be transmitted,

• specify the address of the IMP to which the message is to be sent,

• communicate with the 4C Interface card regarding:

— transmission requests,

— transmission errors,

— transmission busy, and

— ‘break’ character transmission (for resetting locally powered IMP devices).

• specify whether it wants to be interrupted at the end of transmissions.

3.3.3 Receiving measurement results

Measurement data is received only from those IMP devices selected in the POLL TABLE (Section 3.4.6, Page 3-12). The 4C Interface card polls each of these IMP devices in turn.

When an IMP has data ready to send back to the 4C Interface card, it responds to a poll by placing the data on the S-Net. If the data is received successfully, the card places it in the RAM Page for measurement results relating to the IMP. The 4C Interface card then sets the Data Ready (DR) bit and Data Offset for that IMP and stream, in the RECEIVE TABLE (Section 3.4.9, Page 3-15). If the Data Offset in this table is multiplied by four, it gives the address with the IMP’s data page at which the data is to be found.

When measurement data has been read by the PC, the relevant entry in the RECEIVE TABLE should be cleared. This allows the 4C Interface card to receive further measurement data from the IMP and stream.

Data can be received on four streams from each IMP and should reception fail on any stream then the 4C Interface card tries three more times to receive data before reporting an error. The card reports errors by setting the Receive Data Error bit (RXE) in the RECEIVE TABLE for each active stream of the IMP that is being polled.

For all IMP devices, the Host PC can enable interrupts on selected data streams by setting the relevant bits in the RECEIVE INTERRUPT TABLE (Section 3.4.10, Page 3-16). On data streams, for which interrupts are enabled, an interrupt is generated by the 4C Interface card either when data is successfully received or when a ‘receive error’ is reported.

3.3.4 Using interrupts

The 4C Interface card is able to interrupt the Host PC for the following things:

• transmit complete,

• calendar access granted, and

• measurement data received, for each of four streams on up to 50 IMP devices.

Whilst any of these conditions exists, and an interrupt is enabled, the 4C Interface card continues to interrupt the PC. Therefore, special processing of interrupts may be necessary if the Host PC is able to service all sources of interrupts, and not just one or two busy ones.

It is recommended that, once a source of interrupt has gained the attention of the Host PC, any further interrupts from the same source are inhibited until other equally important interrupts have been attended to.

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3.4 INTERFACE CONTROL

3.4.1 Interface Control Register

The Interface Control (IC) register (Figure 3.2) appears on two RAM pages, Page 0 and Page 255. On both pages, the register is located at address 0x100.

PWR RST X X PRG ERROR CODE

Bit 7 Bit 0

(X = Do not care)

Figure 3.2: Interface Control Register

To ensure software compatibility with the original 3595 Host PC to S-Net Interface card (4A), the only function that can be controlled from RAM Page 0 is the PWR function (bit 7). On RAM Page 255, all functions can be controlled. On both RAM pages the state of all bits in the IC register may be read.

The bit functions of the IC register are listed in Table 3.2.

Table 3.2: Bit functions of the IC register

Function * Description

PWR

Power to S-Net: ‘1’ = power on; ‘0’ = power off

IMP devices can be reset by switching the power off and then on again. To ensure that power is completely removed from IMP devices, insert a 250ms delay between these two actions. Note that locally powered IMP devices can be reset by sending a ‘Break’ command from the Transmit Control Register (Section 3.3.2)

Allow a delay of 3 seconds after power-up before attempting to communicate with an IMP. For the Universal IMP (UIMP), allow a delay of 6 seconds.

RST Interface reset: ‘0’ = reset and ‘1’ = no reset.

PRG Not supported at present.

ERROR CODE The meanings of the error codes that may appear in bits ‘0’ thorough ‘2’ are as follows:

0 = No Error. 1 = Dual Port RAM Error. 2 = Local RAM error. 3 = Boot code ROM error. 4 = Main code ROM error. 5 = Firmware failure. (Watchdog has reset the 4C Interface card.) 6 = Host PC software failure. 7 = General error. (See Section 3.4.2 for extended error codes.)

Error codes 1 through 5 indicate that an error has occurred on the 4C Interface card. Therefore, you should return the card for repair. (Please mention the error code detected as this will help in the faultfinding process.)

* See Figure 3.2 for illustration of the IC register

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3.4.2 Extended error codes

The extended error codes stored in RAM location 0x105 consist of the same error codes that appear in the Interface Control Register, and some extra ones.

The error codes and their meanings are:

00 = No Error.

01 = Dual Port RAM Error.

02 = Local RAM error.

03 = Boot code ROM error.

04 = Main code ROM error.

05 = Firmware failure. (Watchdog has reset the 4C Interface card.)

06 = Host PC software failure.

07 = Not applicable

08 = Programming: Bad S-record – does not start with ‘S’

09 = Programming: Bad S-record checksum

10 = Programming: ROM (IC) failed to programme

11 = Programming: ROM (IC) failed to programme

12 = Programming: S-record data was not word aligned.

RAM location 0x105 and the Interface Control (IC) Register are located in different areas of hardware. This allows a fault in one area to be reported in the other: for example, a RAM error may make location 0x105 inaccessible, but the relevant error code could still be read from the Interface Control (IC) Register.

3.4.3 Software status and issue

RAM locations 0x110 and 0x111 hold the status of the Boot software currently installed in the 4C Interface card. Similarly, RAM locations 0x112 and 0x113 hold the status and issue of the Main software. Should new software be installed, the status and issue are updated automatically.

3.4.4 Flash Checksum registers

The Flash Checksum Registers allow the Host PC to check the correct loading of the 4C Interface card software. Locations 0x121 through 0x128 hold the even and odd checksums for Sectors 0 and 1, as shown in Table 3.3. Locations 0x129 through 0x140 are reserved for the checksums of Flash Sectors 2 through 7, which are assigned in the same way.

Location 0x120 holds the flash checksum summary. Bits 0 and 1 in this location indicated the checksum status for Sectors 0 and 1: ‘1’ = checksum okay; ‘0’ = checksum error. Bits 2 through 7 are reserved for the checksum summaries of Flash Sectors 2 through 7.

Table 3.3: Flash Checksum Registers

RAM location Checksum

0x121 Flash Sector 0: even checksum (m.s)

0x122 Flash Sector 0: even checksum (l.s)

0x123 Flash Sector 0: odd checksum (m.s)

0x124 Flash Sector 0: odd checksum (l.s)

0x125 Flash Sector 1: even checksum (m.s)

0x126 Flash Sector 1: even checksum (l.s)

0x127 Flash Sector 1: odd checksum (m.s)

0x128 Flash Sector 1: odd checksum (l.s)

“m.s” = most significant byte; “l.s”. = least significant byte

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3.4.5 Real-time calendar and clock

The 4C Interface card maintains a real-time calendar and clock (Figure 3.3) for timing and the IMP functions.

Calendar Synchronise

0xEE

0xEF

0xF0

0xF1

0xF2

0xF3

0xF4

Bit 7 Bit 0

CGT CIE CRQ

Year

Month

Day

Hour

Minutes

Seconds

Millisecs (100's) Millisecs (10's)

Millisecs (1's)

0xF5

0cF6

0xF7

Calendar Set

Real-time

Calendar

and Clock

Figure 3.3: Real-time calendar and clock

The on-card calendar and clock are set by the Host PC and can be left to run with an accuracy determined by the on-card crystal (error less than 2.5 seconds a day). Alternatively, it is possible to synchronise the 4C Interface card clock to the Host PC clock. Access to the on-card calendar and clock is requested by the PC, and granted by the card, through the Calendar Set Register. The on-card calendar and clock are set by writing an eight-byte time value into locations 0xF0 through 0xF7. Each byte is expressed in the binarycoded decimal format. Synchronisation to the Host PC clock is maintained through the Calendar Synchronise Register.

Synchronising the clock

If software synchronisation is to be used for the real-time clock, the byte at location 0xEE should be set non-zero on the second boundary. The 4C Interface card clears this byte ready for the next synchronisation.

Accessing the calendar

Access to the real-time calendar by the Host PC is requested and granted through the Calendar Set Register, at location 0xEF. The bit functions of this register are as follows:

CGT Bit 7: Calendar Grant. The ‘1’ state indicates to the Host PC that access to the calendar is

granted

CIE Bit 6: Calendar Interrupt Enable. When set to ‘1’, causes Host PC to be interrupted when

calendar access is granted.

CRQ Bit 0: Calendar Request. When set to ‘1’, requests access to the calendar by the PC

Setting up the calendar and clock

To set-up the real-time calendar and clock, the procedure is as follows:

Request access to the calendar and clock by setting the Calendar Request bit (CRQ) in the Calendar Set Register. In addition, set the Interrupt Enable bit (CIE) if an interrupt is required when access is granted.

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Wait either for the Calendar Grant bit (CGT) to be set, or for the interrupt that indicates this has happened.

Write the present Host PC operating system time into the calendar registers.

. Clear the Calendar Set byte to release access to the calendar.

Once initialised, the calendar and clock can be left to run free at the accuracy determined by the on-card crystal (error < 2.5 s/day). Alternatively, to synchronise the clock to the PC system clock, a non-zero value should be written to the Calendar Synchronise byte at the “roll-over” of each second. Note that it is essential to keep the interval between each write to the Calendar Synchronise byte as close to one second as possible, so that the phase-locking process can maintain a regular real-time clock.

3.4.6 Selecting IMP devices for polling

By setting the appropriate bits in the Poll Table (Figure 3.4), the Host PC tells the 4C Interface card which IMP devices are to be polled for data. Throughout the table, each bit represents a specific IMP. Bit 0 of location 0xC8 through bit 1 of location 0xCE represents IMP 1 through IMP 50, respectively.

0xC9

0xCA

0xCB

0xCC

0xCD

0xCE

0xC8

Bit 7 Bit 0

Poll Table

(Receive Enable)

Each bit represents a specific IMP, as indicated by the IMP numbers. When a bit is set, the corresponding IMP is polled for data.

Figure 3.4: Poll Table

In general, a bit should be set for each IMP from which measurement data is required. (See note on powerup settling delay below.) Immediately the poll bits are set by the PC, the 4C Interface card begins to poll the corresponding IMP device(s), checking for data, and reporting communication errors.

The Poll Table set-up can be altered at any time without re-initialising the 4C Interface card. However, once a bit is set, it should not be cleared unless communication errors occur. Errors may be due, for example, to IMP removal or ‘not present’.

NOTE: Power-up Settling Delay

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3.4.7 Selecting the RAM pages

The Page Select Register, at location 0xFF, allows the Host PC to select another RAM page from RAM Page 0. When the number of the required page is written into this register, the 4C Interface card moves the RAM window to allow access to this page. A Page Select Register on the selected page, when read, returns to RAM window to RAM Page 0. (See Section 3.2 page 3-3.)

3.4.8 Transmitting data to the IMP

The Transmit Register (Figure 3.5) allows the Host PC to communicate with the 4C Interface card when it wishes to transmit data to an IMP. The data to be transmitted is written by the Host PC into RAM Page 1. Sections X through Y describe the function of each Transmit Register.

0xE8

0xE9

0xEA

0xEB

0xEC

0xED

Bit 7 Bit 0

TXR TXE

TX Interrupt Enable

Destination Address

(Reserved)

TX Buffer Size (m.s.byte)

TX Buffer Size (l.s.byte)

Transmit

Control

Transmit

Registers

TXB TBK

Not used

Figure 3.5: Transmit Register

Transmission control

The Transmit Control Register is used to control and give the status of transmissions made by the 4C Interface card. The bit functions are as follows:

TXR Transmit Request. The Host PC sets the TXR bit to tell the 4C Interface card that the data on

RAM Page 1 is to be transmitted. Another transmit can be requested only when the TXB bit is cleared by the card.

On completion of the transmission, the TXB bit is cleared. (This is a more precise indication of transmission complete than the clearance of the TXB bit.)

TXE Transmit Error Flag. The 4C Interface card sets the TXE bit to indicate a transmission error.

TXB Transmit Busy. The 4C Interface card sets the TXE bit to indicate that transmission has started.

The bit is cleared after transmission ends; another transmit can then be requested.

TBK Transmit Break. The Host PC sets this bit to tell the 4C Interface card to transmit a break

character on the S-Net.

The break character resets every IMP on the network. It is primarily intended for resetting every locally powered IMP, although it also resets those powered via the S-Net. When every IMP is reset, the TBK bit state returns to ‘0’. A break character can be used to re-establish correct system operation when there are transmit or receive errors.

Transmit or receive errors may be caused by removing an IMP, or replacing one, in an operational system. Although this activity is sometimes necessary, and certainly will not damage the IMP hardware, it is not recommended.

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Transmission interrupts

An interrupt is generated if the byte at location 0xE9 is non-zero and TXR in the Transmit Register is clear.

Destination addressing

The Destination Address Register, in location 0xEA, holds the address of the IMP that is to receive the data on RAM Page 1. The destination address is written into this register by the Host PC.

A message may be ‘broadcast’ to every IMP on the S-Net by making the destination address a zero. This facility is intended primarily as a means of synchronising the time between the 4C Interface card and every IMP on S-Net: time is sent to every IMP simultaneously so that they can operate in a common timeframe. Other messages, such as a measure command, may also be broadcast, which gives a marginal increase in data throughput. With a broadcast message, however, message reception goes unchecked and no indication is given to the PC. Therefore, it is not recommended for messages in a secure environment, i.e. where the function of every IMP is critical and the failure of any IMP to respond must be reported to the PC.

Transmit buffer size

Two bytes are used to hold the number of bytes that are to be transmitted. The maximum number is 256 bytes, which is the capacity of the transmit buffer on RAM Page 1.

Transmit sequence

To transmit a message to an IMP, the Host PC must take the following steps:

Write the message onto RAM Page 1, starting at address 0x00.

On RAM Page 0, set-up the Transmit Registers as follows:

a. Specify the number of bytes to be transmitted by writing this into the Tx Buffer Size Register

b. Specify the IMP that is to receive the command by writing it’s address into the Destination Address

c. Initiate the transmission by setting the TXR (Transmit Request) bit in the Transmit Register.

d. Set the Tx Interrupt Enable byte to non-zero (only if a transmit-complete interrupt is required.)

When the Transmit Request (TXR) bit has been recognised by the 4C Interface card, the card itself sets the Transmit Busy (TXB) bit and the message is then transmitted on the S-Net. If a message is sent to a specific IMP, i.e. the destination address is not zero, the IMP is polled immediately after the message is sent. This poll is for verifying correct message reception. If an acknowledgement of the message is not received, up to three re-tries are performed before an error is reported to the user.

When transmission is complete, the 4C Interface card sets the Transmit Control Register as follows:

Transmit Request (TXR) - clear.

Transmit Error (TXE) - sets only if transmission has failed.

Transmit Busy (TXB) - clear.

If the Interrupt Enable byte was set, the 4C Interface card generates a ‘transmission complete’ interrupt.

In the case of time broadcasts, acknowledgement of reception is of no consequence. The time is broadcast at regular intervals and any IMP not receiving the time, due to being busy, should receive the time data on a subsequent broadcast. A total failure of an IMP to receive data will be reported to the Host PC when that IMP is normally polled.

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3.4.9 Reading the received data status

The Receive Table has the format shown in Figure 3.6. Four consecutive bytes are assigned to each IMP, and these contain the receive status for data streams 0 through 3. For each IMP and data stream, the table tells the Host PC whether the data transmitted by the IMP is ready in the ‘on-card’ RAM, or whether the card has failed to receive this data. Each receive status byte also contains an address offset, which tells the Host PC where to start reading the data stream on the relevant page of RAM.

0x01

0x02

0x03

0x04

0x05

0x06

0x00 DR RXE

Bit 7 Bit 0

Receive

Table

IMP 1

0xC4

0xC5

0xC6

0xC7

0x07

ADDRESS OFFSET

Data Stream 0

Data Stream 1

Data Stream 2

Data Stream 3

Data Stream 0

Data Stream 1

Data Stream 2

Data Stream 3

Data Stream 0

Data Stream 1

Data Stream 2

Data Stream 3

IMP 2

IMP 50

Figure 3.6: Receive Table

For each receive status byte, the bit functions are:

DR Data Ready. When set, this bit indicates that some new data has been received

and is ready on the RAM page assigned to storing IMP measurement results.

RXE Receive Data Error. When set, this bit indicates that the 4C Interface card has

failed after three attempts to receive data transmitted by an IMP.

Address Offset Bits 0 through 5 contain a RAM location offset (divided by 4). This points to the

location in RAM where the first byte of the data stream is located. All data starts on long word boundaries (four bytes).

(The measurement results received from IMP 1 through IMP 50 are stored on RAM pages 2 through 51.)

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3.4.10 Setting receive interrupts

The Receive Interrupt Table (Figure 3.7) is intended for use in ‘task programming’. It allows a Host PC, by setting the relevant bits, to select the data streams for which it is to be interrupted on completion of a receive operation.

0xCF

0xD0

Bit 7 Bit 0

0xE7

IMP 2 IMP 1

IMP 4

IMP 3

IMP 50 IMP 49

Data Stream 0

Data Stream 1

Data Stream 2

Data Stream 3

Data Stream 0

Data Stream 1

Data Stream 2

Data Stream 3

Figure 3.7: Receive Interrupt Table

Each of the four-bit bytes, into which the table is divided, is assigned to a specific IMP. Within each of those bytes, each bit is assigned to a specific data stream. When the Host PC sets a bit in this table, the 4C Interface card generates an interrupt either when measurement data is ready in the on-card RAM or when the card has failed to receive measurement data. An indication of either occurrence is given by the Data Ready and Receive Data Error bits in the relevant byte of the Receive Table (Section 3.4.9).

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3.5 Receiving IMP results and responses

Measurement results from IMP devices are received on RAM pages 2 though 51, which are assigned to IMP 1 through 50 respectively. Each of these pages contains the data, organised as shown in Table 3.1. Sections 3.5.1 through 3.5.4 describe each type of data.

Table 3.4: Content of RAM pages 2 through 51

Location Addresses

Function

000 – 04F (r/w) Data stream 0 (80 bytes)

070 – 073 (r/w) Data stream 1 (4 bytes)

080 – 0EF (r/w) Data stream 2 (112 bytes)

0F0 – 0FB (r/w) Data stream 3 (12 bytes)

0FC – 0FF (r) Unallocated

0FF (w) Page address

100 – 101 (r/w Stream 0 size

102 – 103 (r/w) Stream 1 size

104 – 105 (r/w) Stream 2 size

106 – 107 (r/w) Stream 3 size

108 – 109 (r/w) Stream 0 time tag

110 – 117 (r/w) Stream 1 time tag

118 – 11F (r/w) Stream 2 time tag

120 – 127 (r/w) Stream 3 time tag

128 (r/w) Unallocated

129 (r/w) Transmit retry count

12A – 1FF (r/w) Unallocated

Remember to add the base address of card to these

hexadecimal numbers.

3.5.1 Data streams

IMP devices are able to return four types of data, each type having a particular format. To allow application software to categorise and attach different priorities to the data types, the S-Net protocol segregates them into four data streams. The data-to-stream assignments are listed in Table 3.5, together with size of the buffers that accommodate them.

Table 3.5: Data-to-Stream assignments

Stream No. Data Conveyed Buffer Size

0 Measurement scan or long numeric response 80 bytes

1 Single channel measurement or short numeric response 4 bytes

2 Event information (3595 2A and 3595 2B IMP only) 112 bytes

3 Command responses in ASCII 12 bytes

NOTE:

In response to the SA command (‘Save set-up data’ – see Chapter 1 in Part 2 of this manual), more than 80 bytes may be sent in Stream 0 by an IMP. This may overwrite the boundaries of the area reserved for Stream 0 in the (on-card) buffer space. Stream 0 for the 3595 2B switch-pod is 128 bytes wide. (Therefore, this pod does not use Stream 1.)

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3.5.2 Stream size

The size (number of bytes) of each data stream is stored in locations 0x100 to 0x107. (See Figure 3.8)

0x100

0x101

0x102

0x103

0x104

0x105

Bit 7 Bit 0

Data Stream 0 Size (l.s.byte)

Data Stream 1 Size (m.s.byte)

Data Stream 1 Size (l.s.byte)

Data Stream 2 Size (m.s.byte)

Data Stream 2 Size (l.s.byte)

Data Stream 0 Size (m.s.byte)

0x106

0x107

Data Stream 3 Size (m.s.byte)

Data Stream 3 Size (l.s.byte)

Figure 3.8: Stream size locations

3.5.3 Stream time tags

A time tag is stored for each stream of data received. This includes the date and the time at which the reception of data, at the 4C Interface card, was completed. For the location of the various date and time elements, see Figure 3.9.

0x120

0x121

0x122

0x123

0x124

Bit 7

Bit 0

Month

Day

Hour

Minutes

Seconds

Millisecs (100's) Millisecs (10's)

Millisecs (1's)

0x125

0x126

0x127

0x118

0x119

0x11A

0x11B

0x11C

0x11D

0x11E

0x11F

0x110

0x111

0x112

0x113

0x114

0x115

0x116

0x117

0x108

0x109

0x10A

0x10B

0x10C

0x10D

0x10E

0x10F

0 1 2 3

Year

Data Streams:

Figure 3.9: Stream time tag locations

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3.5.4 Transmit retry count

The transmit retry count (stored at location 0x129) indicates the quality of transmission on S-Net, from the 4C Interface card to the IMP devices.

For each character that the 4C Interface card transmits to an IMP, it expects a response: this is part of the S-Net protocol. Should an IMP fail to respond, three retries are made before an error is reported. In many cases where the quality of the transmission is marginal, the transmission may succeed after several attempts. This is where the transmit retry count can provide a useful check.

Retries should be kept to a minimum since they increase the time taken to transmit data streams. Where the count is particularly high, the serviceability of equipment on S-Net should be investigated.

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3595 4C

PC to S-Net Interface

User Manual

PART TWO

IMP Commands and Responses

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3595 4C USER MANUAL

Part Two Contents

Chapter 1 IMP Commands

1.1 IMP COMMANDS

1.2 COMMAND SUMMARY

1.3 COMMAND DIRECTORY

1.4 SUGGESTED COMMAND PROCEDURES

Chapter 2 Results and Error Formats

2.1 INTRODUCTION

2.2 IEEE 754 FLOATING-POINT FORMAT

2.3 FOUR-BYTE RESULT

2.4 EVENT RESULT FORMAT

2.5 TIME TAG FORMATS (FOR 3595 1H AND 1J IMP)

2.6 HISTORICAL DATA FORMATS (FOR 3595 1H AND 1J IMP)

2.7 IMP ERROR MESSAGES

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3595 4C PC to S-Net Interface User Manual Part Two

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1-1

IMP Commands

Contents

1.1 INTRODUCTION 1-3

1.1.1 Command Strings 1-3

1.1.2 IMP Command Types 1-3

1.1.3 Numbers in commands 1-3

1.1.4 Examples of command strings 1-3

1.1.5 Incorrect commands 1-5

1.1.6 Command delays 1-5

1.2 COMMAND SUMMARY 1-6

1.3 COMMAND DIRECTORY 1-8

1.3.1 Commands for analogue and digital measurements 1-9

1.3.2 Commands for analogue measurements only 1-28

1.3.3 Commands for thermocouple measurements 1-31

1.3.4 COMMANDS FOR STRAIN GAUGE MEASUREMENTS 1-33

1.3.5 COMMANDS FOR DIGITAL MEASUREMENTS ONLY 1-35

1.3.6 COMMANDS FOR ANALOGUE OUTPUTS 1-40

1.3.7 ADDITIONAL COMMANDS FOR 3595 IMP TYPES 1H AND 1J 1-45

1.4 SUGGESTED COMMAND PROCEDURES 1-53

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List of Figures

FIGURE 1.1: SCAN PERIOD COMMAND 1-22

FIGURE 1.2: SCAN SYNCHRONISATION OF 1H AND 1J IMP TYPES 1-24

FIGURE 1.3: SP '250' COMMAND EXAMPLE 1-25

FIGURE 1.4: CONNECTIONS TO '3595 3Y' CALIBRATION BLOCK CONNECTOR 1-42

FIGURE 1.5: SET-UP AND BASIC MEASUREMENT 1-54

FIGURE 1.6: IMP SPECIFIC SET-UP AND STRAIN GAUGE SET-UP 1-55

List of Tables

TABLE 1.1: IMP COMMAND SUMMARY 1-6

TABLE 1.2: ADDITIONAL COMMANDS FOR THE 3595 1H AND 1J IMP 1-7

TABLE 1.3: MODE CODES FOR IMP TYPES 1A, 1C AND 1E 1-10

TABLE 1.4: MODE CODES FOR IMP TYPE 1B (STRAIN) 1-11

TABLE 1.5: MODE CODES FOR IMP TYPE 2A (DIGITAL) 1-12

TABLE 1.6: MODE CODES FOR IMP TYPE 2A (SWITCH IMP) 1-13

TABLE 1.7: MODE CODES FOR IMP TYPE 1H AND 1J 1-14

TABLE 1.8: DATABASE BYTES (1A, 1B, 1C, 1E, 2A AND 2B IMP TYPES) 1-21

TABLE 1.9: DATABASE BYTES (1H AND 1J IMP TYPES) 1-21

TABLE 1.10: AVERAGE SCAN TIMES FOR FAST INTEGRATION IMP DEVICES 1-23

TABLE 1.11: IMP CODES 1-26

TABLE 1.12: CONNECTOR BLOCK CODES 1-27

TABLE 1.13: SCAN RATES V INTEGRATION TIMES FOR TOTALLY FAST IMP SYSTEM 1-29

TABLE 1.14: SCAN RATE (SCAN/SEC) V NO. OF FAST FIVE-IMP SYSTEM 1-29

TABLE 1.15: SAMPLE RATE SETTINGS 1-35

TABLE 1.16: DEFAULT SAMPLE RATES 1-35

TABLE 1.17: TIME-OUT PERIODS 1-36

TABLE 1.18: CALIBRATION RESPONSES 1-42

TABLE 1.19: ANALOGUE OUTPUT STATUS CODES 1-44

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1.1 INTRODUCTION

This chapter provides information on the use of IMP commands, a summary of commands, a detailed command directory, and suggested command procedures.

1.1.1 Command Strings

The following rules apply to command strings:

a. They must not contain more than 256 characters (bytes).

b. They may contain a number of individual commands, as long as they are separated by semicolons.

Commands are executed in order, left-to-right across the string, and responses are returned in order.

c. They must not contain unnecessary spaces or lower case characters.

d. If a command includes some binary-coded information, all bytes of this data must be included.

Omissions can cause both the command involved, and subsequent commands, to be misinterpreted.

1.1.2 IMP Command Types

Command strings are built from two basic command types:

General Commands - applicable to most IMP types

Specific Commands - applicable to a particular type of IMP. For example, the EV command applies

only to the digital and switch IMP devices.

Note: IMP addressing is dealt with in Part 1 of this manual.

1.1.3 Numbers in commands

The majority of commands require one or more numbers to further specify the command. For example, the ME (measure) command must be specified with a channel number. Unless otherwise stated in the command directory, these numbers are ASCII (keyboard) characters and not numeric variables.

1.1.4 Examples of command strings

A string of two or more commands may be sent by inserting semicolons between individual commands. On receipt of a command string, the IMP executes each command in turn, left-to-right. Each command string should not exceed 256 characters (bytes) in length, including semicolons.

As an example, the command sequence SE;TR provides a quick measurement set-up:

On an IMP other than the Universal IMP ‘1H and ‘1J, it selects ‘volts dc auto-ranging’ (for analogue versions) or ‘digital status’ (for digital and switch versions).

On the UIMP, it sets analogue channels 1 through 18 to ‘volts dc auto-ranging’ and digital channels 19 and 20 to ‘digital status’.

It arms the IMP to make measurements.

It tells the IMP to take a scan – that is, measure on all channels.

NOTE: Details of the Vibration IMP (VIMP) commands are given in the SI3595 1F&G VIMP Programmer’s Manual (P/N: 35952200)

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Other useful command sequences are:

a. RE ; CHnMO103 ; MEn (For analogue IMP and Universal IMP)

This command resets previous settings, sets channel n to ‘volts dc 2V range’, and tells the IMP to take a measurement on channel n.

(On an IMP other than the UIMP, channel n can be any channel; on the UIMP, channel n can be any channel from 1 through 18)

b. RE ; CHnMO902; MEn (For digital IMP and Universal IMP)

This command resets previous settings, sets channel n to ‘frequency measurement – gate time 1 second’, and then tells the IMP to take a measurement on channel n.

(On an IMP other than the UIMP, channel n can be any channel; on the UIMP, channel n can be any channel from 19 or channel 20)

c. SE ;CO ; TR(For any IMP)

This command sets every IMP (all channels) to either ‘volts dc auto-ranging’ (analogue IMP) or ‘digital status’ (digital or switch IMP) and enables measurements, enables continuous measurement scanning, and then starts the scanning (measuring on all channels). Scans will continue being made until the buffers available are full or until the HA (halt) command is issued.

d. Examples (a.) and (b.) can be extended to setting up every channel on an IMP and begin scanning. To do this,

use CH MO entry in the Command Directory to decide the required function of each channel. Then string together all the appropriate CH MO commands (one for each channel). As an example, IMP type 1A would have twenty CH MO commands sent to it in order to configure every channel:

RE ; CH1MO100 ; CH2MO500 ;……; CH20MO310 ; AR ; TR

e. RE ; CH1MO600 ; CH1GAn

1n2n3n4

; IN1 ; ME1 (For analogue IMP 1B only)

Where: n

1…n4

= IEEE 754 floating-point number

= most significant byte

For a strain gauge factor of, say, 2.25,

First byte n1= 010000002 equivalent to 64

Second byte n2= 000100002 equivalent to 16

Third byte n3= 000000002 equivalent to 0 Fourth byte n

= 000000002 equivalent to 0

This command sequence:

• resets previous settings,

• sets channel 1 to measure strain using a ½-bridge (4mA) configuration on auto-ranging,

• uses a strain gauge factor of 2.25 in strain calculations,

• initialises the strain gauge, and

• tells the IMP to take a measurement on Channel 1.

A detailed explanation of how to convert the decimal number ‘2.25’ into a binary number in IEEE 754 floatingpoint format is given in Chapter 2.

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1.1.5 Incorrect commands

The IMP checks command strings for correct syntax. If it finds a command that it does not understand, it ignores the command and moves on to the set of characters after the next semicolon (or the next command string if the message ends before a semicolon occurs).

For example, if the following command string is sent to an IMP:

HELLO; TR

The first five characters, HELLO, mean nothing to an IMP and it will ignore these. The command TR will then be processed and executed.

However, it is possible to send an IMP a command that it understands, but can’t obey. For example, the command may specify an invalid mode or range. In such a case, the IMP stores an appropriate error code and returns this when it next receives a measure or trigger command for the affected channel(s). Thus, when the command string does not instruct an immediate response, the error is not immediately reported; this may lead to confusion.

Therefore, it is important that the application software checks that each command sent has the correct syntax and that the parameters as valid.

1.1.6 Command delays

To ensure that an IMP correctly executes commands, it is good practice to insert a delay of 100ms between command strings and a delay of 500ms after each of the following commands: REset, TRigger and HAlt.

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1.2 COMMAND SUMMARY

Table 1.1: IMP Command Summary

Applicable to … (3595 1A, 1B, etc)

Command

1A 1B 1C 1D 1E 1H 1J 2A 2B

Purpose Sect.

∗∗∗ ∗∗∗∗∗

Arms an IMP.

3.1

CH MO

∗∗∗ ∗∗∗∗∗

Sets channel mode.

“

∗∗∗ ∗∗∗∗∗

Continuously scan channels.

“

∗∗∗ ∗∗∗∗∗

Cancels the AR command.

“

∗∗∗ ∗∗∗∗∗

Halts all measurements.

“

∗∗∗ ∗∗∗∗∗

Loads saved set-up information.

“

∗∗∗ ∗∗∗∗∗

Takes a single measurement

“

∗∗∗∗∗∗∗∗∗

Sets all IMP settings to default.

“

∗∗∗ ∗∗∗∗∗

Store set-up data.

“

∗∗∗ ∗∗∗∗∗

Quick set-up of all IMPS.

“

∗∗∗ ∗∗∗∗∗

Set scan period.

“

∗∗∗∗∗∗∗∗∗

Request information on IMP.

“

∗∗∗ ∗∗∗∗∗

Request data from (armed) IMP.

“

∗∗∗ ∗∗∗

Calibration on specific ranges.

3.2

∗∗∗ ∗∗∗

For test purposes only.

“

∗∗∗ ∗∗∗

Sets the integration time.

“

∗∗∗∗∗∗∗

Calibrate ON.

“

∗∗∗ ∗∗∗

Selects units of Temperature

“

∗∗∗∗∗

Ambient temperature reference.

3.3

∗∗∗∗∗

Sets reference temperature.

“

∗∗∗∗∗

Sets thermocouple check for o/c

“

CH GA

∗

Loads IMP with gauge factor.

3.4

CH OF

∗

Sets the strain gauge offset.

“

∗

Sets strain gauge parameters.

“

CH RA

∗∗∗

Sets the sample rate.

3.4

CH TI

∗∗∗

Sets the time-out period.

“

∗∗∗

Clear event-totalling counter.

“

∗∗

Enables event capture.

“

∗∗

Event status.

“

∗∗ ∗

Enable/Disable hardware w/dog.

“

∗

Status format, IEEE/compressed

“

∗∗ ∗

Enable/Disable software w/dog.

“

CH VO

∗

Sets channel to voltage

3.6

CH IO

∗

Sets channel to current.

“

CH CV

∗

Calibrates voltage channel.

“

CH CI

∗

Calibrates current channel.

“

∗

Request info. on o/p channels.

“

Abbreviations used: “w/dog” = watchdog, “o/c” = open-circuit, “o/p” = output, “info.” = information

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Table 1.2: Additional commands for the 3595 1H and 1J IMP

Command Purpose

CH LR Returns the loop resistance of a thermocouple

CH UC Converts a measured parameter into alternative units, with the function y = mx + c.

Defines a set of coefficients to be used for thermocouple linearisation. (These are applied by selecting the appropriate channel mode.)

CH PL Enables a measured parameter to be linearised into alternative units

PL Defines coefficients of the polynomial applied by CH PL.

CH HL Defines a high limit for channel alarm checking.

CH LL Defines a low limit for channel alarm checking

CH GO Defines a group of alarm channels to be used with a digital output channel.

AS Enables an IMP to start automatically after a hard reset.

RM Selects the result mode from real-time, time tagged, historical.

FB Flushes the historical results buffer.

SD Saves the database in the IMP flash PROM.

RD Restores the database in the flash PROM to the database proper.

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1.3 COMMAND DIRECTORY

In this directory, the IMP commands are classified under the following headings:

Commands for Analogue and Digital Measurements

Commands for Analogue Measurements Only

Commands for Thermocouple Measurements

Commands for Strain Gauge Measurements

Commands for Digital Measurements Only

Commands for Analogue Outputs

Additional Commands for the Universal IMP

In each section, commands appear in alphabetical order.

Each command description is headed with the command code and the command title in brackets. For example:

CH MO

(Set CHannel MOde)

The command syntax is shown by a flow diagram, which includes any command variables. For example:

Note that the command codes are shown in bold UPPER CASE characters and variables in lower case Italics. Only the items in boxes

form part of the command string. A description of each command variable, and the variable limits, appear under the flow diagram as illustrated above. Following the flow diagram, the following information is given:

Note Detailing specific IMP devices when appropriate.

Function Description of command function.

Response What the IMP transmits to the PC in response to the command

Solartron Mobrey 3595 4C User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual