BEL BM-A1-S User Manual page 22

BEL DIGITAL AUDIO
Set up alarms (0x84)
Bit 6 Bit5
Reset
Byte 0
Toggle
Byte 1
Disable
The Auto bit will cause the BM-A1 to generate spontaneous ACK signals every second while
an alarm is active. The toggle disable bit will inhibit the set-up function of the front panel
toggle switch.
Request Detail (0x85)
This command will cause the BM-A1 to respond with a frame containing the command 0XC5
and data describing the state of the unit and any alarms.
Bit 6
Byte 0
Byte 1
Alarms
Byte 2
Alarms
Byte 3
Byte 4
Byte 5
Byte 6
Request Current switch settings (0X86)
This command will cause the BM-A1 to respond with a frame containing the command 0XC6,
data describing the settings of the front panel and internal switches.
The data will be returned in the same format as the set up switch command (0X85).
ACK format
ACK is a standard frame with command 0xC0 and one data byte. This byte contains brief alarm and
status information.
Byte 0
 2004 BEL (Digital Audio) Ltd
BM-A1-S
Bit4 Bit3
Auto
Anti- Phase Anti-Phase
3/4 1/2
Bit 5 Bit 4
Anti-phase Anti-phase
3/4 1/2
Armed Anti- Armed Anti-
phase 3/4 phase 1/2
SDI AES2 AES1
lock lock lock
Bit2 Bit1
Audio Audio
Channel 4 Channel 3
Over-level Over-level
4 3
Bit 3 Bit 2
Ms bit of
Audio
select
Audio loss Audio loss
4 3
Audio over- Audio over-
level 1 level 1
AES 2 lock
Embedded Embedded
4 3
Armed Armed
Audio loss Audio loss
4 3
Armed Armed
Audio over- Audio over-
level 4 level 3
Remote mode Auto
19
BM-A1 serial protocol
Bit0
Audio Audio
Channel 2 Channel 1
Over-level Over-level
2 1
Bit 1 Bit 0
Audio Audio
select select
Audio loss Audio loss
2 1
Audio over- Audio over-
level 1 level 1
AES 1 lock SDI lock
Embedded Embedded
2 1
Armed Armed
Audio loss Audio loss
2 1
Armed Armed
Audio over- Audio over-
level 2 level 1
Audio Alarm
Version 0.3