On Sat, 10 Apr 2010, jiangcaoyang wrote:
> Recently, I was thinking of buying a TS-7200 for my own project. As I
> read through the manual, I found out a big problem. My computer don't
> have a RS-232 port. So, the way I want to solve this problem is by using
> a USB-to-RS-232 cable. Since I have never used this board before, I don't
> know if this is feasible.
Yes it is feasible.
> Also, the serial communication requires a
> null-terminated cable. Does that mean I have also need to buy a
> converter?(convert general rs-232 to null-terminated rs-232?).
No. It is not a null-terminated cable - it is a null modem cable. It means
an rs232 cable designed to join computers together. Essentially the cable
is designed to join transmit at one end to receive and the opposite end.
(and CTS to RTS etc). If you use no flow control on the RS232 connection
then you need a cable with 2 female 9 pin connectors at each end, with pin
5 connected to pin 5 (Ground), and pin 2 to pin 3 and pin 3 to pin 2.
Or you can buy a cable already made up.
There is absolutely loads of info on rs232 cables and connectors etcon the
internet - google is your friend.
> Another problem is the official site says using minicom as terminal
> emulator. So, which port should I use? I got like 3 USB terminals. I have
> no idea which port should I configure to. I looked into /dev, there is
> ttyS0 to tty40. Which one is correspond to which USB?
Once you plug in a USB rs232 adapter the device /dev/ttyUSB0 (or 1, 2 etc)
will be created. You use that.
ttyS0 is a standard serial port - if it's there it looks like you actually
do have a serial port, it might just not be brought out to a socket on your
PC. Many motherboards have pins for extra ports that are not connected to
the "standard" sockets. Consult your motherboard manual.
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