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Using the PC Interface
Your OKIFAX 740 is equipped with a serial interface (1)
for connection to a serial ‘COM’ port on a PC.
This facility enables a PC running a fax program, such as
WinFax Pro or LaserFax, to send and receive fax messages
without the need for intermediate printing.
In addition to an IBM-compatible PC, you will need a
suitable PC fax application program, such as WinFax Pro
or LaserFax, and an RS-232 serial data cable to connect
the PC interface to a serial ‘COM’ port on the PC.
Connecting the PC
LaserFax is normally supplied with a suitable RS-232 data
cable, other programs may not. If you need to purchase a
cable, contact your dealer or usual PC accessory supplier.
The PC interface port on your OKIFAX 740 is presented
as a 9-way D-type socket. Pin assignments are as follows:
Pin Signal Note
1 Data Carrier Detect (DCD) 1
2 Receive Data (RD) 2
3 Transmit Data (TD) 3
4 Data Terminal Ready (DTR) 1
5 Signal Ground (SG)
6 Data Set Ready (DSR) 1
7 Request To Send (RTS)
8 Clear To Send (CTS)
9 Ring Indicator 4
Notes: 1 Pins 1, 4 & 6 are connected together inside
the fax machine.
2 Data on pin 2 in received from the telephone
line and sent to the host PC.
3 Data on pin 3 is sent from the host PC to the
telephone line.
4 No connnection.