4.2.1 PC Connection
CAUTION
To protect the system, keep the following in mind:
1.
Make sure that both connector cases (frame ground) of the RS-232C cross cable (shielded cable)/USB
cable are conductive. If they are not conductive, make sure that both connector cases of the cable are
firmly connected.
2.
If this is not possible, connect the frame of the PBX to the frame of the PC using a grounding wire in
order to prevent difference in the electrical potentials.
Note
For pin assignments and maximum cabling distance, refer to "3.12.1 Connection of Peripherals".
External Modem Connection
Modem
To RS-232C port (25-pin)
To CO line/PBX extension
port assigned as the CO line destination
External Modem (25-pin)
Signal Name
RD (RXD)
SD (TXD)
ER (DTR)
DR (DSR)
CAUTION
To protect the system, keep the following in mind:
1.
Make sure that both connector cases (frame ground) of the RS-232C straight cable (shielded cable)
are conductive. If they are not conductive, make sure that both connector cases of the cable are firmly
connected.
2.
If this is not possible, connect the frame of the PBX to the frame of the external modem using a
grounding wire in order to prevent difference in the electrical potentials.
After connecting the PBX and the external modem, set the power switch of the external modem to "ON", then
the external modem will be initialized with the default values.
The following AT command settings may be required for the modem:
•
The Data Terminal Ready (DTR) signal should be ignored.
•
The Data Terminal Equipment (DTE)/Modem flow control should be turned off.
204
Installation Manual
Pin No.
3
2
20
6
RS-232C Port
(9-pin)
PBX (9-pin)
Pin No.
Signal Name
2
RD (RXD)
3
SD (TXD)
4
ER (DTR)
6
DR (DSR)
Document Version 2009-12