Arcam MZ 12 Manual - Halaman 13

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Introduction

This document describes the remote control protocol for controlling the MZ8/12 via the RS232 interface.

The document relates to MZ RS232 control protocol version 1.0. Any updates to this protocol will be posted on the Arcam Extranet website at

http://www.arcam.co.uk/extranet.

The cable is wired as a null modem:

Connector 1 pin

Connector 2 pin

Data transfer format

• Transfer rate: 38,400bps.

• 1 start bit, 8 data bits, 1 stop bit, no parity, no flow control.

All hexadecimal numbers begin 0x.

Any character in single quotes gives the ASCII equivalent of a hex value.

<n> represents an unknown or variable number.

Communication between the remote controller (RC) and the MZ8/MZ12 takes the form of sequences of bytes, with all commands and responses having

the same basic format. The MZ8/MZ12 shall always respond to a received command, but may also send messages at other times.

Each transmission by the RC is the following format:

St (Start transmission): 0x21 '!'

Zn (Zone number): see below.

Cc (Command code): the code for the command

Dl (Data length): the number of data items following this item, excluding the ETR

Data: the parameters for the command

Et (End transmission): 0x0D

Each response by the MZ8/MZ12 is the following format:

St (Start transmission): 0x21 '!'

Zn (Zone number): see below.

Cc (Command code): the code for the command

Ac (Answer code): see below.

Dl (Data Length): the number of data items following this item, excluding the ETR

Data: the parameters for the response of length n. n is limited to 255.

Et (End transmission): 0x0D

The MZ8/MZ12 responds to each command from the RC within three seconds. The RC may send further commands before a previous command

response has been received.

Function

Rx  Tx

Tx  Rx

RS232 Ground