DIS DCS-6000 Manual de usuario

DCS 6000

Technical specifications

Danish Interpretation Systems DIS

Digital Conference System

DCS 6000

External Microphone Control

RS232 protocol

Please refer to ‘Revision History’ at page 4 for compatibility to releases prior to Release 5.1.

Danish Interpretation Systems Technical Specifications

No part of this publication may be reproduced or utilized in any form or by any means without permission in writing from the

publisher

1 List of Contents

1List of Contents ............................................................................................................................ 2

1.1 Revision history................................................................................................................... 4

2Introduction and document overview.......................................................................................... 5

2.1 Restrictions in DCS6000..................................................................................................... 5

2.2 Voting Concepts .................................................................................................................. 5

2.2.1 Voting session............................................................................................................... 5

2.2.2 Attendance check.......................................................................................................... 6

2.2.3 Late Attendance ............................................................................................................ 6

2.3 Notation................................................................................................................................ 7

3Serial Protocol.............................................................................................................................. 8

3.1 Package format.................................................................................................................... 8

3.2 CRC Calculation................................................................................................................. 9

3.3 Encoding .............................................................................................................................. 9

3.4 Message types .................................................................................................................... 10

3.4.1 CU reset (CU external)........................................................................................... 10

3.4.2 Change binary Control Mode (external CU).......................................................... 10

3.4.3 Send Control Message to CU (external CU).......................................................... 10

3.4.4 Receive Control Message from CU (CU external)................................................ 11

3.5 Building a control message – step by step....................................................................... 11

4DCS 6000 Messages................................................................................................................... 12

4.1 Addresses in the DCS 6000 system.................................................................................. 12

4.2 Group addresses................................................................................................................ 12

4.3 Messages from the external unit to the CU..................................................................... 12

The following sections describe the messages from each message group.................................. 13

4.3.1 Messages in EXTERNAL_CONTROL_GRP ............................................................ 13

4.3.2 Messages in MICROPHONE_CONTROL_GRP....................................................... 14

4.3.3 MICROPHONE_PRIORITY...................................................................................... 17

4.3.4 Messages in EXTERNAL_AUDIO_CONTROL_MU............................................... 18

4.3.5 Messages in Voting_CONTROL_GRP...................................................................... 21

4.4 Summary of control messages (External Unit 



CU)................................................... 24

4.5 Messages from the CU to the external unit..................................................................... 26

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Messages in MAIN_GRP............................................................................................................ 27

4.5.1 Messages in EXTERNAL_CONTROL_GRP ............................................................ 27

4.5.2 Messages in MICROPHONE_STATUS_GRP........................................................... 28

4.5.3 Messages in EXTERNAL_AUDIO_STATUS_MU .................................................. 33

4.5.4 Messages in VOTING_STATUS_GRP...................................................................... 35

4.5.5 Messages in UNIT_ATTENDANCE_STATUS_GRP............................................... 38

4.5.6 Messages in UNIT_VOTE_STATUS_GRP............................................................... 40

4.6 Summary of status control messages (CU 



External control unit)........................... 41

5Controlling Microphones........................................................................................................... 44

5.1 CRC Calculation............................................................................................................... 44

5.1.1 CU Reset message....................................................................................................... 44

5.1.2 Entering binary microphone control mode ................................................................. 44

5.2 Registering with the CU ................................................................................................... 44

5.2.1 Power up of the CU after connecting.......................................................................... 45

5.2.2 Power up of the CU before connecting....................................................................... 46

5.3 The Heart Beat process..................................................................................................... 47

5.4 Retrieving the microphone system status ....................................................................... 47

6Additional detailed example....................................................................................................... 50

6.1 Example - Registration with the CU ............................................................................... 50

6.1.1 Step (1) – Entering Microphone Control Mode.......................................................... 50

6.1.2 Step(2) – Requesting registration in the CU............................................................... 52

6.1.3 Step(3) – Registration reply from the CU................................................................... 53

6.2 Example 2 – Turning on the microphone of a delegate................................................. 55

Danish Interpretation Systems Technical Specifications

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1.1 Revision history

21-07-2003

A Initial version of the document.

25-02-2004

B Corrected a fault in section 3.4.4 Control Job Received (CU external).

Format of the message corrected

17-06-2004

C Updates and additions to the descriptions.

03-07-2004

D A section with summary of the control messages and status of control messages

has been added. Examples of the code has been added in chapter 6

10-10-2004

E Commands in section 4.3.2, 4.3.3 and 4.5.3 have been changed as part of the

firmware release 5.1.

Applications made for previous releases have to be updated reflecting those

changes.

The actual sections are marked with a frame around the text.

14-02-2006

F Commands for voting control (license option).

08-05-2006

G Correction to registration, when using voting control.

18-05-2006

H Addition to voting control (secret voting + 5-button voting)

12-09-2006

I Addition of message for setting up microphone speak priority. Refer to ‘4.3.3

MICROPHONE_PRIORITY’

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2 Introduction and document overview

The DCS 6000 system offers the possibility of controlling the microphones from a PC, AMX or other

external control unit via a serial connection. This text documents how this feature is used; how

external control of the DCS 6000 system is executed.

The protocol used on the cable between the central unit (CU) of the DCS 6000 system and the external

control unit is described in general in section 3.

Parts of this protocol encapsulate the protocol used on the DCS 6000 bus and thus enable the CU and

the external control unit to communicate as if the latter was a unit on the bus. The parts of the DCS

6000 protocol, which are relevant for controlling the microphones are described in section 4.

Section 5 summarizes and exemplifies how to use the protocol described in sections 3 and 4 to control

the microphone application.

Additional detailed examples are shown in section 6.

2.1 Restrictions in DCS6000

The RS232 protocol control described herein provides descriptions for an external control unit to do

microphone control, audio settings and voting in the DCS6000 system. Basic functionality is hereby

made available, however some restrictions need mentioning:

-The Voting control functionality is protected by a license feature within the CU.

-There is no support for Dual microphone units or units sharing a microphone.

-There is no support for Voting units without microphones.

For voting functionality to become available, the CU must be provided with a CU license key that

enables voting and voting control through the RS232 connection.

2.2 Voting Concepts

2.2.1 Voting session

Voting sessions are controlled (setup/opened/closed) from an external control unit.

First, the following voting parameters must be setup from external control:

-Voting Type (3-Button Voting or 5-Button Voting)

-Secret Voting (Open Voting or Secret Voting)

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3-Button voting sessions provide the delegates with the option to make a selection among three

alternatives: (typically Yes, Abstain and No), whereas 5-button voting sessions offer 5 alternatives

(typically ++, +, 0, - and --).

During an Open voting session, the votes are captured by the voting units, and the voting units show to

the delegate, which button was pressed. If a voting session is defined as Secret, the voting units still

A voting session is opened and closed from an external control unit. Only during an open voting

session, the delegates are able to cast their votes.

During an Open voting session, the CU informs about votes received from the delegates. And,

furthermore, the CU continuously transmits interim results, both when running Open and Secret voting

sessions. When the voting session is closed, the CU informs about the final voting result.

The voting result remains in the CU until the next voting session is started, or until the CU is reset. The

result is available for an external control unit to read as long as it is valid.

2.2.2 Attendance check

Prior to a voting session, it is often desireable to sustain, how many delegates are actually present. In

order to determine the number of delegates present, an Attendance Check is carried out. From an

external control unit the CU is commanded to start an attendance check. A single button (the ‘Present’

button) starts flashing on the microphone units, and the delegates can acknowledge their presence by

pressing this button.

During an attendance check, the CU informs the external control unit about units, where the delegate

has pressed the ‘Present’ button. Furthermore, the CU continuously informs the latest number of

present delegates (interim result). When the Attendance check is ended, the CU reports the final

attendance check result.

The CU stores the final result until next time an attendance check is started, or until the CU is reset.

This result can be read from the CU as long as it is valid.

2.2.3 Late Attendance

Late Attendance is defined as the ability to vote despite a delegate has not participated in a previous

attendance check. The CU allows late attendance.

In order to keep a correct attendance check result, the CU actually updates the attendance check result

if late attendance occurs during a voting session.

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After completion of a voting session, the attendance check result consists of delegates, who

participated in the actual attendance check plus delegates participating only in the voting session (late

attendance).

2.3 Notation

The RS232 protocol is defined byte for byte (1 byte = 8 bits). This document uses the following

notation to describe these bytes:

Type of notation Syntax Example

ASCII representation ’value’ ‘m’

Decimal representation <value> <109>

Hexadecimal representation [value] [6D]

The example shows, that the byte-value of the 8-bits ..01101001..

can be perceived as the ASCII character ‘m’, as the decimal value 109 or as the hexadecimal value

0x6D.

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3 Serial Protocol

All communication between the CU and the external control unit is done through a serial connection

either via RS232 or RS422. The format of the serial data is 8 data bits, 1 stop bit and no parity.

Possible bit rates are 2400, 4800, 9600, 19200, 38400, 57600 and 115200 bits/s. The default is 115200

bits/s. Hardware flow control is used on the serial port.

The CU provides a possibility to save the settings in a configuration. Whenever the CU powers up, the

settings stored in the configuration are applied. The bit rate setting is part of the configuration, and is

applied after power up.

3.1 Package format

Communication between the CU and an external control unit consists of binary packages (messages).

Each binary message consists of bytes. The format of the packages sent between the CU and the

external control unit is as follows:

START is the constant 0xFC that indicates the start of a message

Message Type is a byte indicating the type of the message. The message types used is described in

section 3.4.

ID is a byte identifying this message in a stream of messages. Each time a message is sent this number

is incremented. When the maximum allowed value, 63, is reached the counter is wrapped. Separate

counters are used for message from the CU and messages to the CU.

Data byte 0 – Data byte N is the actual message to be sent.

CRC is an 8-bit CRC value for the message. The CRC is calculated over the bytes between the Start

and CRC. The calculation is described in section 3.2.

STOP is the constant 0xFD that indicates the end of a message.

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3.2 CRC Calculation

An 8-bit CRC calculation with the polynomial x

+x+1 is used for the serial communications. A C

implementation of a function calculating the CRC value of a message is given below:

unsigned char CalcCRC(unsigned char *Message, unsigned char Length)

{

UCHAR Crc;

UINT k;

Crc = 0;

for (k=0; k < Length; k++)

Crc = CrcTable[Crc ^ (*Message++)];

return Crc;

}

The variable CrcTable used above refers to this array:

unsigned char CrcTable[]={

0, 7, 14, 9, 28, 27, 18, 21, 56, 63, 54, 49, 36, 35, 42, 45,

112, 119, 126, 121, 108, 107, 98, 101, 72, 79, 70, 65, 84, 83, 90, 93,

224, 231, 238, 233, 252, 251, 242, 245, 216, 223, 214, 209, 196, 195, 202, 205,

144, 151, 158, 153, 140, 139, 130, 133, 168, 175, 166, 161, 180, 179, 186, 189,

199, 192, 201, 206, 219, 220, 213, 210, 255, 248, 241, 246, 227, 228, 237, 234,

183, 176, 185, 190, 171, 172, 165, 162, 143, 136, 129, 134, 147, 148, 157, 154,

39, 32, 41, 46, 59, 60, 53, 50, 31, 24, 17, 22, 3, 4, 13, 10,

87, 80, 89, 94, 75, 76, 69, 66, 111, 104, 97, 102, 115, 116, 125, 122,

137, 142, 135, 128, 149, 146, 155, 156, 177, 182, 191, 184, 173, 170, 163, 164,

249, 254, 247, 240, 229, 226, 235, 236, 193, 198, 207, 200, 221, 218, 211, 212,

105, 110, 103, 96, 117, 114, 123, 124, 81, 86, 95, 88, 77, 74, 67, 68,

25, 30, 23, 16, 5, 2, 11, 12, 33, 38, 47, 40, 61, 58, 51, 52,

78, 73, 64, 71, 82, 85, 92, 91, 118, 113, 120, 127, 106, 109, 100, 99,

62, 57, 48, 55, 34, 37, 44, 43, 6, 1, 8, 15, 26, 29, 20, 19,

174, 169, 160, 167, 178, 181, 188, 187, 150, 145, 152, 159, 138, 141, 132, 131,

222, 217, 208, 215, 194, 197, 204, 203, 230, 225, 232, 239, 250, 253, 244, 243};

The CRC calculation is done byte by byte, starting with the Message Type and ending with the last

data byte, both included.

Examples on CRC calculations are found in section 5.1

3.3 Encoding

Since the values used for the start and stop delimiters occasionally have to be used inside the

messages, the data in the packets are encoded to avoid using these values. In order to achieve this a

third control value Escape, with the value 0xFE, is introduced. Whenever one of the values 0xFC,

0xFD and 0xFE are needed in a message, they are replaced with a two byte sequence as detailed here:

Value to be

sent Encoded as

0xFC {Escape} 0

0xFD {Escape} 1

0xFE {Escape} 2

Encoding of the contents of the binary message is done after the CRC calculation.

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3.4 Message types

The following sections describe the types of messages that are sent between the CU and the external

control unit. For each message type the format of the messages of this type is shown, this description

excludes the start/stop delimiters and the CRC. The field <ID> in the following descriptions refers to

the identifier byte introduced in section 3.1.

3.4.1 CU reset (CU 



external)

When the CU powers up, it transmits a binary message on the serial interface, in order to inform

external control units, that the DCS 6000 system (CU) has been turned on.

The format of the CU reset message is:

3.4.2 Change binary Control Mode (external 



CU)

This message is sent from the external controller to the CU in order to change the binary control mode

of the serial interface. The message format is either

which changes the mode to microphone control mode. Or

which leaves the microphone control mode.

3.4.3 Send Control Message to CU (external 



CU)

This message is used to send a DCS 6000 message to the CU asking it to perform some operation or

deliver some data. The messages available are discussed in section 4.3. The format of the message is:

Chain is the chain number the control job originates from. This field exists because the command can

be used to simulate control jobs originating from messages on the DCS 6000 bus. Just set this value to

LSB addr and MSB addr are the least respectively the most significant bytes of the external control

units address. See section 5.2 on how to obtain a unique address for an external control unit.

Message Group defines the message group of the message to send. The message groups are defined in

section 4.3.

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