Audio Engineering Axium AX-400DA Instruction Manual - Rs232 Protocol
RS232 Protocol
The RS232serial port provides data acquisition and control of the Axium amplifiers by a home automation
system, or PC.
The interconnecting cable must be ‘Null modem’: 9 pin female ‘D’ connectors at both ends (pin connections
2 and 3 swapped at one end) only RX, TX & 0V (pin 5) are used.
Baud Rate = 9600, Characters are all ASCII.
Command Structure: command>zone>data>line feed.
Command
Command
Description
01
Standby
02
Mute
03
Source Selection
04
Volume
05
Bass
06
Treble
07
Balance
09
Send All parameters
0B
Cause key press on Keypad
0C
Amplifier features
0D
Maximum Volume Limit
0F
Link Zone
11
Volume Up
12
Volume Down
14
Request Device information
1C
Zone Name
1D
Preamplifier Volume Mode
1E
Preset Selection / status
26
Volume BCD format
28
Video Source selection
Zone
Amplifiers are encoded with up to 32 zones
The zone byte is used for checking if the command is applicable to the device receiving the command and if
so, for optionally selecting a “sub-device”, e.g. a bank or part of a device. All Zones are addressed using FF.
- The lower 5 bits of the zone byte represent the zone 0 – 31 selection, i.e:
00000 bin = 00 (hex) = zone 0
00001 bin = 01 (hex) = zone 1
01010 bin = 0A (hex) = zone 10
11111 bin = 1F (hex) = zone 31
- The upper 3 bits represent the sub-device. The sub-device codes for an Axium amplifier are:
standard amplifier
= 000
page preset amplifier
= 001
standard preamplifier = 010
page preset preamplifier = 011
Examples: Addressing a zone 10 preamplifier: Binary 010-01010 or 2A hex
Send ASCII “2A”
Addressing a zone 10 amplifier: Binary 000-01010 or 0A hex
Send ASCII “0A”
Addressing all Zone amp & preamplifier: FF hex
Send ASCII “FF”
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