2b.md

0x2b Telephone LEDs

Telephone 0xc8 → Displays (Multicast) 0xe7

This command controls the BMBT and MID telephone indicators.

Related Commands

• 0x4a Tape Control/Radio LED
• 0x4f BMBT Monitor Control

Example Frames

C8 04 E7 2B 00 00
C8 04 E7 2B 10 10
C8 04 E7 2B 14 14

Parameters

The message length is a fixed. The single data byte is a bitfield.

LED_RED     = 0b0000_0011
LED_YELLOW  = 0b0000_1100
LED_GREEN   = 0b0011_0000

Red 0b0000_0011

LED_RED_OFF         = 0b0000_0000
LED_RED_ON          = 0b0000_0001
LED_RED_BLINK       = 0b0000_0011

Yellow 0b0000_1100

LED_YELLOW_OFF      = 0b0000_0000
LED_YELLOW_ON       = 0b0000_0100
LED_YELLOW_BLINK    = 0b0000_1100

Green 0b0011_0000

LED_GREEN_OFF       = 0b0000_0000
LED_GREEN_ON        = 0b0001_0000
LED_GREEN_BLINK     = 0b0011_0000

Use Cases

More so "usage" than "use cases", but anyhow..

C8 04 E7 2B 01 01   # Red: On
C8 04 E7 2B 03 03   # Red: Blink
        
C8 04 E7 2B 04 04   # Yellow: On
C8 04 E7 2B 0C 0C   # Yellow: Blink

C8 04 E7 2B 10 10   # Green: On
C8 04 E7 2B 30 30   # Green: Blink