Brainboxes 1 Port Rs232 Card, User Manual

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1 Port RS232 Card Chapter 8
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Connect the earth lines.
Line 5 of Serial Port 2 to lines 1 & 7 of the other PC.
This gives the two devices a common earth level.
Connect the Transmit and Receive lines together.
Line 3, TXD, Port 2 goes to line 3, RXD, of the other PC.
Line 2, RXD, Port 2 goes to line 2, TXD, of the other PC.
This allows each to receive the data transmitted by the other.
Connect the Port 2 DTR line, pin 4 to the other PC DCD, pin 8 and CTS, pin 5,
lines.
Also, connect up the other PC DTR line, pin 20 to the Port 2 DCD, pin 1 and
CTS, pin 8, lines.
This allows the receiving device to signal when it can no longer accept data. The
receiving device sets DTR false when it is unable to receive any more data. The
sending device reads DTR on its CTS and DCD pins. It should stop sending
when CTS goes false.
Connect the Port 2 RTS line, pin 7, to the other PC DSR line, pin 6. Also,
connect the other PC RTS line, pin 4, to the Port 2 DSR line, pin 6.
This RTS line is used to let the other device know that it is ready for data
exchange.
9 Pin D Serial Port To Other PC Cable.
9 PIN D CONNECTO 25 PIN D CONNECTOR
9 Pin D Serial Port To A Modem.
If you are connecting a MODEM to a 9 pin D Serial Port then you will NOT
need a cross over cable and a straight through cable connected as the 9 to 25 pin
adapter.