User manual

101

USER MANUAL

Data Transmission Frequencies – Standard DTMF Signaling

Digit Low Tone

(Hz.)

High Tone

(Hz.)

Digit

Value

0 941 1336 10

1 697 1209 1

2 697 1336 2

3 697 1477 3

4 770 1209 4

5 770 1336 5

6 770 1477 6

7 852 1209 7

8 852 1336 8

9 852 1477 9

B(*) 941 1209 11

C(#) 941 1477 12

D 697 1633 13

E 770 1633 14

F 852 1633 15

Notes:

1) The digit ‘0’ is transmitted with a value of 10 and shall be counted as a 10 in

calculation of the message checksum.

2) The DTMF pair of 941 Hz. And 1633 Hz. is not used in this format and shall not be

sent.

3) The frequency deviation on each of the above frequencies shall be ± 1.5% max.

Kissoff (Acknowledgement) Tone

The Kissoff tone from the receiver is used to tell the transmitter that the message

has been received successfully. The frequency of the tone shall be 1400 Hz. ±3%

and shall be sent by the receiver for a minimum of 750 msec. and a maximum period

of 1 second.

The transmitter must detect a minimum of 400 msec. of tone before considering the

kissoff to be valid.

WT1010C2 – USER MANUAL – Rev.2.7 – Technical Support : Technical@witura.com