Service manual

EXTERNAL SERIAL CONTROL PROTOCOL
B-27
April 2001
Part No. 001-9800-203
Table B-6 COMMAND REMOTE NOTIFICATIONS Flags
Bit Name Events
7 (MSB) REMOTE CALL EVENTS EVENT CALL DETECTED
EVENT CALL LOST
6 REMOTE TRANSMIT
EVENTS
EVENT TRANSMIT
5 REMOTE AUDIO EVENTS EVENT AUDIO GATE
4 REMOTE DISPLAY
EVENTS
EVENT DISPLAY UPDATE
3 REMOTE KEYPAD EVENTS EVENT KEYPAD
2 REMOTE SOUND EVENTS EVENT SOUND
1 REMOTE ROTARY EVENTS EVENT ROTARY
0 (LSB) [reserved] must be zero
Call Guard Byte Format:
Data
:
Call Guard type:
0x00 - No Call Guard squelch
0x01 - Tone Call Guard squelch
0x02 - Digital Call Guard squelch
0x03 - Inverted digital Call Guard squelch
0x04 - 0x0f - reserved, do not use
High Digit: High order octal digit of Call Guard
value
External: Indicates if external Call Guard line must
also be detected
Mid Digit: Middle octal digit of Call Guard value
Ext Active: Indicates external Call Guard squelch
active state (high or low)
Low Digit: Low order octal digit of Call Guard
value
Reserved: Reserved, must be set to zero
CMD SET FREQ
Function
: Requests that the subscriber unit switch to
the requested transmit and receive frequencies. The
frequency value is expressed in 1.25 KHz units and
can be calculated as follows:
Desired Frequency (in Hz) ÷1250
The current platform is only capable of locking on
6.25 KHz channels. Therefore, attempting to set a
frequency that is not divisible by 6.25 KHz causes
a parameter error to be returned.
Format
:
Data
: Tx & Rx Freq - Transmit and receive
frequencies in 1.25 kHz units. Send MSB first.
CMD SET IF BANDWIDTH
Function
: Requests that the subscriber unit select the
requested I/F bandwidth. The protocol supports
two bandwidth settings; however, some units may
only allow one.
Reserved Low Digit Reserved Mid Digit
1 bit 3 bits 1 bit 3 bits
External High Digit Type
1 bit 3 bits 4 bits
Opcode Tx Freq Rx Freq
1 byte 4 bytes 4 bytes
0x25