Datex-Ohmeda S-5 Service Manual B-INT

Datex-Ohmeda

S/5™ Interface Board, B-INT (Rev. 01)

Technical Reference Manual

Datex-Ohmeda Inc.
3030 Ohmeda Drive
53707-7550 MADISON, WIS
USA
Tel. [phone], Fax [phone]

www.us.datex-ohmeda.com

All specifications are subject to change without notice.

Document No. 8001006-1

June 2001

Datex-Ohmeda Division,

Instrumentarium Corp.

P.O. Box 900, FIN-00031

DATEX-OHMEDA, FINLAND

Tel. [phone] Fax [phone]

www.datex-ohmeda.com

 Instrumentarium Corp. All rights reserved.

Table of contents

TABLE OF CONTENTS

Interface Board, B-INT (Rev. 01)

TABLE OF CONTENTS i
Introduction 1
1 Specifications 2

1.1 Serial I/O definitions.................................................................................................................................2

1.2 Analog definitions.....................................................................................................................................2

2 Functional Description 3

2.1 Main components.....................................................................................................................................4

2.2 Connectors and signals.............................................................................................................................6

2.2.1 Bus connectors................................................................................................................................6

2.2.2 Serial connectors.............................................................................................................................8

2.2.3 Serial/analog connectors.................................................................................................................9

3 Service Procedures 10

3.1 General service information.....................................................................................................................10

3.2 Service check.........................................................................................................................................11

3.2.1 Recommended tools......................................................................................................................11

4 Troubleshooting 16

4.1 Troubleshooting chart.............................................................................................................................16

5Service MENU 17

5.1 Interface menu.......................................................................................................................................18

6 Spare Parts 20

6.1 Interface Board, B-INT.............................................................................................................................20

7 Earlier Revisions 21

APPENDIX A

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Service check FORM A-1

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INTRODUCTION

The Interface Board, B-INT, provides an interface between the S/5 Anesthesia Monitor or the S/5
Critical Care Monitor and other monitors. It also provides a connection between the Central Unit, F­CU8, and the Airway Module, G-xxxx.

Interface Board, B-INT

Figure 1 Interface Board, B-INT

NOTE: The Interface Board, B-INT, and Interface Module, M-INT, cannot be used simultaneously in
the same monitor.

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1 SPECIFICATIONS

1.1 Serial I/O definitions

• RS-232 buffered (channels 1-4)

• All standard baud rates are possible from 300 to 115200

• Each interfaced device has fixed baud rate.

1.2 Analog definitions

• There are four analog inputs available on channel 1 and four on channel 2.

• All analog inputs are op-amp buffered, with an input impedance of 1 MΩ. Each analog

input is also equipped with a 1 MΩ pull-down resistor to -12 V for NC detection.

• Sampling rate: 10 ms/sample/channel

• Input range: -10 V...+10 V

• Resolution: 10 bits → 1024 voltage levels in input range

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2 FUNCTIONAL DESCRIPTION

The Interface Board, B-INT, detects and identifies external monitors connected to the S/5
anesthesia or critical care monitoring system. Identification is made by a serial data string sent by
the external monitor.

On the front panel of the board there is a 25-pin and a 9-pin D-connector, which are used for
sending/receiving digital serial data. The 25-pin D-connector is used for connecting the Airway
Module (as the Gas Interface Board is removed when the Interface Board, B-INT is installed).

On the surface of the circuit board there are three pin row connectors, one for digital data and two
for digital and analog data. If digital and analog real time waveforms are required, the external
monitor can be connected to the serial/analog connectors (X7 and X8) using additional interface
connector cables.

Interface Board, B-INT

Figure 2 Interface Board, B-INT, block diagram

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2.1 Main components

The Interface Board contains an 80C196KC16 CPU.

External connections

The connectors on the board are:

• 96-pin E-connector for the CPU mother board (X1)

• 25-pin D-connector for an Airway Module (X3).

• 9-pin D-connector for RS-232 level isolated serial communications (X2). No analog inputs

available.

In addition, three pin-row connectors on the circuit board make the following connections possible
using an interface connector cable:

• RS-232 level serial and analog connectors for all interfaces (X7, X8).

• RS-232 level serial digital connector (X9).

X3 and X9 connectors can be used to interface waveforms from Dräger Cato and Cicero external
monitors.

The Interface Board is connected to the Central Unit module bus through the CPU mother board.
Serial communication signals for transmitting (TxD) and receiving (RxD) data are sent to the

microcontroller ports. The direction of the communication is controlled by REC/SND/ signal at the
buffers. The RESET/ signal always resets the communication to the RxD state.

Reset

The Interface Board is reset when the Central Unit is reset (MAIN/RESET/) or when the module bus
is reset (RESET_RS485).

The RESET/ signal is sent to an address decoding GAL circuit, from which it goes to the
microcontroller as RESET/Z. When the RESET/ is active (low), the RESET/Z also goes low and
resets the microcontroller.

Serial communication channels

A QUART is used to provide four serial communication channels (TxD, RxD). The microcontroller is
able to reset the QUART at any time by pu lling the QRESET signal high. The QUART is also reset
when the microcontroller is reset; the microcontroller pulls all the port 1 signals high when it resets.

Memories

There are static RAM, EPROM, EEPROM memories and an address decoding GAL unit on the
Interface Board.

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The microcontroller communicates with the EEPROM in serial mode.

Digital inputs

Analog inputs

Fuse

Interface Board, B-INT

Four digital inputs are connected to connector X9 on the Interface Board. They pass through to the
microcontroller's high speed pins (DIGBUS). The digital inputs have an overvoltage protection and
a pull-up circuit.

Eight analog inputs are connected to connectors X7 and X8. They pass through EMI filters and low­pass filters to the microprocessor port 0.

A 4 A fuse is installed on the Interface Board for the +24/+32 Vdirty input supply. This voltage is
not used on the board but passed through to the 25-pin D-connector for Airway Module use.

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