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Page 12
State Messages :
The CallShop Fone Display provides certain messages to a PC control program to allow the
program to know the state of the device, and what the caller is doing. Each message is a
single ASCII character, followed by 1 or more parameters and ending with a
<CR>
.
Hook State:
The “H” message provides information about the change of state of the telephone hook
switch.
Format:
Hx
<CR>
H
= “H”
x
= State. 0 = On Hook; 1 = Off Hook
Example:
State of telephone
Message Sent
Phone goes off hook
H1
<CR>
Phone goes on hook
H0
<CR>
Digit Dialed:
The “D” message provides information about digits dialed by the user.
Format:
Dx<CR>
D
= “D”
x
= Digit dialed by the user.
Example:
State of telephone
Message Sent
User dials 3
D3
<CR>
User dials 6
D6
<CR>
By receiving the digits dialed by the user with these messages, and concatenating them
together, a PC program can easily determine the telephone number the user is dialing as he
is dialing it (in real time).
