Endress+Hauser memo-graph Version II Betriebsanleitung Seite 91

The initialisation must be done using the identical data format (Baurate, Data bits,
Parity) as in the VDM unit.
Four functions must be activated in the modem:
Ignore the DTR input condition
Switch off data flow control (Hardware-Handshake) : /Q0 or &H0 or &K0 or
Receive call
Store initialisation
The command in order to switch off the data flow control is dependent on the type of
modem. It can be either taken from the modem operating manual or the following four
initialisation strings versions can be tried out one after the other:
AT&D0/Q0S0=1&W
AT&D0&H0S0=1&W
AT&D0&K0S0=1&W
AT&D0+IFC=0,0;S0=1&W
After a successful initialisation the modem is connected to the unit using a special
(null-)modem cable.
Only three cores are needed (TxD, RxD, GND).
Unit SUB-D 9 pin
2
3
5
Unit SUB-D 9 pin
2
3
5
Hint: The original modem cable cannot be used for this task because the modem and
unit have the same pin layout at the interface connector.
The modem that is connected to the PC does not have to be initialised. The
connection is also made using the original modem cable (normally delivered with the
modem).
The first connection is constructed as follows:
In the delivered PC software select "Unit - Display/change unit settings/create new
unit"
- Select unit, select serial connection (COM, Baudrate,
number of data bits, parity)
- Activate modem operation - Set up modem
- Set up selection and telephone number for the selected unit.
- OK
The dial command selection always starts with AT. The additional characters are
dependent on the telephone system being used. Important characters are:
D = Dial
T = Tone dial
P = Pulse dial
W = Wait for dial tone
X = Do not wait for dial tone
, = One second pause
: &D0
+IFC=0,0; (dependent on modem type)
: S0=1
: &W0
Modem SUB-D 9 pin
2
3
5
Modem SUB-D 25 pin
2
3
7
7. Serial interfaces/Modem
Cable connections
Modem at the PC
89