Axium AX250i Bedienungsanleitung

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Communications Protocol
Data acquisition and control of Axium equipment is performed by home automation systems or
personal computers using a special protocol developed by Axium. This document explains the protocol
itself and the low level transport.
1. Transport
1.1. RS-232
The lead must be a straight wired cable, except on the AX4752 and prior models this was a “null
modem”, which is a 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.
Each byte in the command is encoded into two ASCII encoded hexadecimal characters. A line feed
signals the end of the command. The carriage return that is typically used in combination with the line
feed is optional and is ignored. XON and XOFF (characters 11h and 13h) are used for flow control
where the XOFF state times out after approximately 1.5 seconds in order to prevent an inadvertent
system lock up.
If the device that is receiving a command is capable of transmission, it should transmit the command
back to the originator. This is required because of connection issues with RS-232. For example a PC's
TX is connected to an amplifier's RX and the amplifier's TX is connected to a keypad and the PC's RX.
For the PC to communicate successfully with the keypad, all that arrives on the amplifier's RX must be
sent back out its TX. To avoid possible endless cycles, the device originally sending a command must
ignore the command if it is received again.
1.2. USB
Previously the CDC class (abstract control model) was employed to emulate RS-232, enabling
software to interact with devices supporting USB theoretically without need of change. However from
the AX-800DAV onwards a proprietary protocol is in use.
1.3. Axium Bus
The Axium bus is based on the I²C bus and allows multiple devices to be attached to a common bus.
All transmissions are performed using multi-master mode and take the following form:
<start bit><address byte><command data><stop bit>
The address byte is a requirement of the I²C bus. 7 bit address mode is used and the R/W bit is
always 0 (always writing). Address 30h is used for the Axium protocol (02h was used by older devices
until this address was declared as being reserved). Other addresses are used such as 3Ah (for
Ethernet packets) and 20h (for transmission preambles to ensure collision free access to the bus).
Other devices using different protocols can be connected to the Axium bus if they use different
addresses and support multi-master mode.
1.4. Infrared
The infrared interface allows Axium devices to be controlled using the Axium Communications
Protocol. It is not suitable for two-way communications unless combined with RS232 or the Axium bus.
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Inhaltsverzeichnis

Seite 1 - Communications Protocol

Communications ProtocolData acquisition and control of Axium equipment is performed by home automation systems or personal computers using a special p

Seite 2 - 1.5. Ethernet

• Standard time to DST changeover week• Standard time to DST changeover weekday• Standard time to DST changeover hour• Hour (0..23). Bit 7 set if in D

Seite 3 - 2. Command Protocol

The remaining bytes list the zones in the group and are in {0..95}. Zones can be removed from the group by defining new groups which exclude the zone

Seite 4

bytes IP addresses (4 bytes per address): IP address, subnet mask, DNS server, default router.• 81h = Request network name• 82h = Request time server

Seite 5

only. Bit 4 is set for UTC and clear for local time.• Day (1..31)• Month (1..12)• Year (0..255, where 0 = 2000)Notes:• AX450I, AX4750I and all later a

Seite 6

change to the amplifier volume on zone B but also implies a change to the Preamp volume on zones A and B.• The “no operation” command is useful for re

Seite 7

4. KRXm: Modulation period in 0.2µs (4 cycles @ 20MHz) units, one byte. 0 when no modulation is used, FF when command is undefined in which case, no b

Seite 8

• 0B – 32 kHz, 16 bit stereo PCM• 0C – 44 kHz, 16 bit stereo PCM• 0D – 48 kHz, 16 bit stereo PCMKeypad key codesAn Axium Keypad may be directed to emi

Seite 9

13 33 53 73 93 B3 D3 F3 Band (4)14 34 54 74 94 B4 D4 F4 Stop (3)KRXmREPEATS KEYContinuous 1 2 3 4 5 6 7 00 20 40 60 80 A0 C0 E0 Volume Down01 21 41

Seite 10

18 38 58 78 98 B8 C8 F8 219 39 59 79 99 B9 C9 F9 51A 3A 5A 7A 9A BA CA FA 81B 3B 5B 7B 9B BB CB FB 01C 3C 5C 7C 9C BC CC FC 31D 3D 5D 7D 9D BD CD FD 6

Seite 11

15 35 55 75 95 B5 D5 F5 Skip16 36 56 76 96 B6 D6 F6 Stop17 37 57 77 97 B7 D7 F7 Play18 38 58 78 98 B8 D8 F8 019 39 59 79 99 B9 D9 F9 91A 3A 5A 7A 9A B

Seite 12

The modulation frequency is 44.1 kHz and all bursts of IR are 1ms in length. The length of the pauses between the IR bursts is what contains the data.

Seite 13

2. Command ProtocolCommand structure: <command><zone>[<data>[<data>[...]]]Command: The command byte can have the following val

Seite 14

32 Source Gain33 Page Preset 2 Selection34 Clipping notification35 IR routing assignments36 Party mode select/deselect37 Party mode configuration38 Zo

Seite 15

03 Standby B on04 Toggle standby A05 Toggle standby B06 Standby A and B off07 Standby A and B onStandby B only applies to the AX50i and AX250i.Mute( 0

Seite 16

10 frequency error11 too many different period lengths12 IR function too long13 compressed IR function too long18 EEPROM comms error19 EEPROM erase er

Seite 17

Keypad Bank Assignment( 13 )upper 4 bits is the amplifier source and the lower 4 bits are the keypad bank. If the upper 4 bits are all set ( F ), the

Seite 18

• Weekdays (bit 0 = Sun, bit 1 = Mon, .., bit 6 = Sat). Bit 7 is set to deactivate auto activation.8 bytes for the zone selection: lower 32 bits (last

Seite 19

Request device log entry( 22 )3 - 5 bytes in request, 11 or more bytes in response when entry exists, 4 bytes when not.Request contains:• Device ID (2

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