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I have ordered from Black Box but their prices seem inflated. DALCO
Electronics http://www.dalco.com seem to have better prices and they
specialize in the stuff that you need when you put together your own
computers.
On the specific problem of splitting serial port input, you may want to
consider an "internal" rather than an "external" solution. A few years ago
I bought a UPS and they tried to sell me a proprietary RS232 cable for $35
to run their monitor software. Instead, I took a spare 10-pin IDS dual row
to DB9 Male ribbon cable that goes from the mother board to the expansion
card ports and made my own adapter. All that was required was to make a
parallel cut between the wires that had to be switched to free them from the
ribbon. Then cut, cross, and splice the wires.
You could use this idea to make a ribbon cable "Y" with one end a DB9 male
connected to two ribbons that end in IDS dual row connectors. (This assumes
that you will be using the two serial ports on your mother board.) All you
have to do is start with two 10-pin IDS dual row to DB9 Male ribbon cables
(Delco item #59476 $2.50, 9 Pin serial port on page 20 of catalog 35). On
one cut the cable as close as possible to the DB9 male. On the other cable
isolate the wires that have to be spliced as described above and splice the
wires from the two cables together. If you are going to solder the splices,
wait until after successful testing.
On an RS232 cable, 2 is Transmitted Data and line 3 is Received Data. The
lines are numbered on the face of the male connector.
RS 232 9 Pins
1 2 3 4 5
-----------------
\ * * * * * /
\ * * * * /
-------
6 7 8 9
DB9 Male
1 DCD Data Carrier Detect
2 RXD Received Data
3 TXD Transmitted Data
4 DTR Data Terminal Ready
5 GND GrouND
6 DSR Data Set Ready
7 RTS Request To Send
8 CTS Clear To Send
9 RI Ring Indicator
RS 232 25 Pins
1
1 2 3 4 5 6 7 8 9 0 1 2 3
---------------------------------
\ * * * * * * * * * * * * * /
\ * * * * * * * * * * * * /
-----------------------
2
4 5 6 7 8 9 0 1 2 3 4 5
DB25 Male
1
2 TXD Transmitted Data
3 RXD Received Data
4 RTS Request To Send
5 CTS Clear To Send
6 DSR Data Set Ready
7 GND GrouND
8 DCD Data Carrier Detect
9 TEST
10 TEST
11 STF Select Transmit Frequency
12 SDCD Secondary DCD
13 SCTS Secondary CTS
14 STXD Secondary TXD
15 TXC DCE TX Clock
16 SRXD Secondary RXD
17 RXC RX Clock
18
19 SRTS Secondary RTS
20 DTR Data Terminal Ready
21 SQ Signal Quality
22 RI Ring Indicator
23 CH/CI rate select
24 XTC DTE TX Clock
25
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