Manual Modem PCDxx7 Serie│Doc. 26/793; Ed. E2│30.04.2005
Restrictions
Introduction
1-2
1
Saia-Burgess
Controls Ltd.
All these functions will be seen in details later in this document and examples of us-
ing them will be shown.
1.2
Restrictions
There are few restrictions when using the modem library. Those are the following
restrictions:
•
To handle correctly the modem and the telecommunication, the functions need
the modem control signals, as the DCD and DTR. Those have to be wired. Due
to this, only the serial interface 1 of the PCD (PCD2.F120) or interface 2 e.g. 4
(PCD7.F522 as one RS232) can be use for the modem communication.
•
The number of all the function and data block in the modem library can be
changed, except the FC700 (which contains sub-functions for other functions).
•
Using old or low cost modem, some restriction can apply.
•
If using all possibilities of the modem library, 10 Kbytes of memory are neces
sary to integrate the whole library in your project.
Modem DRIVER
FB70
DB_Modem
DB100
MODEM
Calling function
FC701
SMS or Pager
function
Protocols function
SERIAL
COM 1
User
communication
function
S7 user
application
DCD
Modem DRIVER
sub-function
FC700
DTR