MonitorMF

Property MonitorMF
 As Boolean

Description

Set this property true to monitor the R1 MF signals (CCITT R1). Event OnMF() will be fired, if MF tone detected.

Remarks

MF signals: Unacknowledged pulse, multi-frequency signals that are used for forward signaling only. In response to a proceed-to-send signal on the line-signaling system, the MF register transmits the address information en bloc, preceded by the key pulse (KP) signal and terminated by the stop pulse (ST) signal.

R1 MF Tone Specifications

MF Signals (CCITT R1)
Code	Frequency Pairs (Hz)		Name
1	700	900	1
2	700	1100	2
3	900	1100	3
4	700	1300	4
5	900	1300	5
6	1100	1300	6
7	700	1500	7
8	900	1500	8
9	1100	1500	9
0	1300	1500	0
*	1100	1700	KP
#	1500	1700	ST
a	900	1700	ST1
b	1300	1700	ST2
c	700	1700	ST3

The standard length for generating all other R1 MF tones is 68 ms. 

See Also

OnMF