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13
RS232 Control
Conventions
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.
Command and response formats
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. e 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> <Zn> <Cc> <Dl> <Data> <Et>
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> <Zn> <Cc> <Ac> <Dl> <Data> <Et>
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
e MZ8/MZ12 responds to each command from the RC within three seconds. e RC may send further commands before a previous command
response has been received.
1
5
6 9
1
5
6 9
DB9 Female
DB9 Female
e cable is wired as a null modem:
Connector 1 pin Connector 2 pin Function
2 3
Rx Tx
3 2
Tx Rx
5 5 RS232 Ground
Data transfer format
• Transfer rate: 38,400bps.
• 1 start bit, 8 data bits, 1 stop bit, no parity, no ow control.
Serial Cable Specification
Introduction
is document describes the remote control protocol for controlling the MZ8/12 via the RS232 interface.
e 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.