>DB25M	DB25F	DB25F	short	long name from
>common	ttya	ttyb	name	my RS232C notes
>
>1	1	1		protective ground
>2	2		TXD	transmitted data
>3	3		RXD	received data
>4	4		RTS	request to send
>5	5		CTS	clear to send
>7	7	7		signal ground
>8	8		DCD	received line signal detector
>12		8	DCD	secondary received line signal detector
>13		5	CTS	secondary clear to send
>14		2	TXD	secondary transmitted data
>16		3	RXD	secondary received data
>19		4	RTS	secondary request to send
>
>If you are so inclined, you can also wire up more signals for ttya; the
>only ones that I would expect you would want to bother with are
>
>6	6		DSR	DCE ready
>20	20		DTR	DTE ready
>22	22		RI	ring indicator
>
>though 22 of the 25 pins actually have something assigned to them.
>(Well, 24 if you count two "reserved for testing" pins.)

i dunno how you count 22 or 24 from that.  that looks to me like 12 or
15.  :)

anyway...in my e450 manual it describes the pinout for the cable,
which seems to match the one that i have that actually works, so:

1	-	-	-
2	txd_a	o	transmit data
3	rxd_a	i	receive data
4	rts_a	o	ready to send
5	cts_a	i	clear to send
6	dsr_a	i	data set ready
7	gnd	-	signal ground
8	dcd_a	i	data carrier detect
9	-	-	-
10	-	-	-
11	dtr_b	o	data terminal ready
12	dcd_b	i	data carrier detect
13	cts_b	i	clear to send
14	txd_b	o	transmit data
15	trxc_a	i	transmit clock
16	rxd_b	i	receive data
17	rxc_a	i	receive clock
18	rxc_b	i	receive clock
19	rts_b	o	ready to send
20	dtr_a	o	data terminal ready
21	-	-	-
22	-	-	-
23	-	-	-
24	txc_a	o	transmit clock
25	txc_b	o	transmit clock

in case that's of any use to anyone...

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