7K • Chapter 4
4-24
Two-Tone Sequential Page Messages
Control Character
the control character 9930 must be entered before the actual page code when
building a Two-Tone Sequential Page Message. If several two-tone pages are
to be sent, the control character 9930 must exist before each two-tone page
code.
Format
The format for two-tone sequential page messages is as follows:
• Enter the control character 9930.
• Enter four digits representing the frequency of the first tone, taken from the
Tone Code Table on page A-20.
• Enter two digits representing the duration of the first tone in tenths of
seconds. The range of duration is 0.1 to 9.9 seconds.
• Enter four digits representing the frequency of the second tone, taken from
the Tone Code Table.
• Enter two digits representing the duration of the second tone in tenths of
seconds.
• The range of duration is 0.1 to 9.9 seconds.
• You may end the message with the (*) character, or enter another control
character (99xx) and continue with another message type.
For example, the format of a two-tone sequential page of 349.0Hz for 1.0
seconds followed by 433.7Hz for 3.0 seconds is 9930286510230630.
Delays
A 1-second pre-page delay is created by the message handler for the first page
in a group. If additional pages follow, the pre-page delay is eliminated in
succeeding pages. A 1.3- second post-page delay is created by the message
handler for all two-tone sequential pages.
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