Arcam (A&R Cambridge Ltd), Pembroke Avenue, Waterbeach, CAMBRIDGE, CB25 9QR, England
+44 (0)1223 203200 www.arcam.co.uk/extranet
RS232
(solo movie)
3
Controlling the Arcam Solo Movie via RS232
Introduction
Solo Movie is tted with an RS232 serial connector that allows remote control from a PC, or similar
device. This section of the document describes the protocol for controlling Solo Movie 2.1 or 5.1 via the
RS232 interface.
Conventions
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The remote controller is referred to as the ‘RC’.
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All values in this section are hexadecimal values, unless otherwise specied.
Data transfer format
<
Transfer rate: 38,400bps.
<
1 start bit, 8 data bits, 1 stop bit, no parity, no ow control.
Serial cable specication
The cable is wired as a null modem:
Connector 1 Connector 2 Function
2 3
Rx 3— Tx
3 2
Tx —4 Rx
5 5 RS232 ground
Data transfer format
<
Transfer rate: 19,200bps.
<
1 start bit, 8 data bits, 1 stop bit, no parity, no ow control.
Command and response formats
Communication between the RC and Solo Movie takes the form of sequences of bytes, with all
commands and responses having the same basic format. Communication between the two is full duplex.
Solo Movie shall always respond to a received command.
Each transmission by the RC shall be at least six bytes in the following format:
<STR> <ZN> <CC> <NB> <Data> <ETR>
<
STR (Start transmission): 0x21
<
ZN (Zone)
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CC (Command code): the code for the command
<
NB (Number of bytes): the number of data items following this item, excluding the ETR
<
Data: [Byte(1) - Byte(NB)]
<
ETR (End transmission): 0xD
Each response by Solo Movie shall be at least seven bytes in the following format:
<STR> <ZN> <CC> <RC> <NB> <Data> <ETR>
<
STR (Start transmission): 0x21
<
ZN (Zone)
<
CC (Command code)
<
RC (Reply code)
<
NB (Number of bytes): the number of data items following this item, excluding the ETR
<
Data: [Byte(1) - Byte(NB)]
<
ETR (End transmission): 0xD
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