Make your cable to match the signal as follows.

Pin Number	Function	Serial Port	Description
-----------------------------------------------------------

1		none		none		none
2		TXD		A		transmit data
3		RXD		A		receive data
4		RTS		A		ready to send
5		CTS		A		clear to send
6		DSR		A		data set ready
7		GND				Ground
8		DCD		A		data carrier detect
9		none		none		none
10		none		none		none
11		DTR		B		data terminal ready
12		DCD		B		data carrier detect
13		CTS		B		clear to send
14		TXD		B		transmit data
15		TRC		A		transmit clock
16		RXD		B		receive data
17		RXC		A		receive clock
18		RXC		B		receive clock
19		RTS		B		ready to send
20		DTR		A		data terminal ready
21		none		none		none
22		none		none		none
23		none		none		none
24		TXC		A		transmit clock
25		TXC		B		transmit clock