Specifications

M1 Control RS-232 ASCII String Protocol Page 21 of 68 Rev. 1.79 July 16, 2009
The Output Change Update will also be transmitted out M1XSP Serial Port
Expanders that are configured in the Generic Mode.
4.8 Audio Equipment Command (CD)
An M1XEP Ethernet Module is required to intercept the “cd” command. These
commands are sent into the M1XEP via the Ethernet connection and passed
through to the M1. The M1XEP builds custom audio commands to control the
audio equipment and sends these commands to the audio equipment via ethernet.
An IP232 Ethernet Module may be required at the audio equipment to received the
commands if no Ethernet Port is available on the audio equipment. The incoming
“cd” command can trigger Rules in the M1 which can fire outgoing audio
equipment “CD” commands or other control Rules. ELKRP downloads the Audio
Equipment Command tables into the M1XEP according to the Audio Equipment
Manufacturer. M1 version 4.1.11, 5.1.11 or later is required.
4.8.1 Incoming Audio Command (cd)
0F – Length as ASCII hex
cd – Request Audio Command
NN – Which audio command from Audio Command Table.
SS – Audio Source Information
ZZ – Audio Zone Information
VVV – Audio State or Value
00 – future use
CC – Checksum
The “cd” command may or may not use the audio source
and zone information.
Example: 0Fcd01020300000AD Audio command 1, Source 2, Zone 3, Power
On
Example: 0Fcd10020305000A8 Audio command 10, Source 2, Zone 3,
Volume Level = 50
4.8.2 Audio Command Table (used by M1XEP)
Function Description (numeric NN value)
Power Off 0-Turns the zone power Off.
Power On 1-Turns the zone power On.
Power Toggle On/Off 2-Toggles Power state of a zone.
Next Source 3-Steps to next source
Source 4-Select a source input.
Previous Select 5-Steps backward to previous available.
Next Select 6-Advances forward, next.
Volume Down 7-Decrement the zone volume.
Volume Up 8-Increment the zone volume.
Mute Audio 9-Toggles the mute on/off of a zone.
Volume set 10-Set zone volume to a level.