Here's an update. I'd apprciate comments and answers to some of the
questions I pose. Jon's email to me follows my post.
Thanks Jon for checking out your null modem cable with the JST-245.
I don't have a null modem cable so that is a problem. I'll have to get it or
an adapter at Radio Shack.
This evening, I've done an internet search for the DB25, DB-9, and null modem
pinouts. I also now understand the problem with the JST-245 manual RS-232C
cabling instructions. The manual assumes a DB-25 serial port on the
computer, an old standard that is probably never used on laptops.
Did your JST-245 indicate "REMOTE" when you controlled it with the computer
as the JST-245 manual says it will?
And why did you change Radio> Number of radios to 2?
My intention is also to send CW from the computer.
I think that to control the transceiver frequency/mode/etc. only pin 2
(transmit data), pin 3 (receive data) and signal ground (pin 5 on DB9 and pin
7 on DB-25) are needed. Or do I need signal ground?
To transmit CW, I think I need to somehow connect pin 20 from DB-25 (DTR)
plus pin 7 from DB-25 (signal ground) to the 4N33 CW circuit ? And for PTT,
I somehow need to connect pin 4 on the DB-25 (RTS) and pin 7 (signal ground)
to the transceiver PTT jack? Do those of you who have done this fabricate
your own cable, use a breakout box, or some other method?
Am I correct in thinking I need pin 7 (signal ground) in all the above
connectios or do I instead need pin 1 of the DB-25 (chassis ground)?
Doug W0AH
<<Hi Doug
...I took my serial cable for JST-245D out and
checked for its configuration for you, hi.
Typical Null-Modem cable is made in RED cable and so obvious. Another
alternative (my case) is to use "regular" modem cable with Null-Modem
adapter (this cable was originally used with KAM+ for Packet). I think
they are both available at Radio Shack.
PC end (DB9 female, connecting COM port: male)
JST-245 end (DB25 male, connecting RS-232C: female on JRC)
DB9 female DB25 male
pin 1 - pin 4 & 5
pin 2 - pin 2
pin 3 - pin 3
pin 4 - pin 6
pin 5 - pin 7
pin 6 - pin 20
pin 7 - pin 8
pin 8 - pin 8
pin 9 - NC
If you are using 25 pin ~ 25 pin, hope you can translate my connection to
your case. Obviously the cable configuration in JRC's manual is wrong.
I have never done that. I just brought up WL (10.21K), changed Setup and
click COM1 for Rig > JRC JST-145/245 > AUTO, and changed Radio > Number of
Radios to 2. Sure enough WL started tracking JST-245's mode and frequency.
I have not try to check PTT on COM port, hope this works too.
73 (and Gud Luck in CQWWCW), Jon nn5t@arrl.net>>
--
WWW: http://www.writelog.com/
Submissions: writelog@contesting.com
Administrative requests: writelog-REQUEST@contesting.com
Problems: owner-writelog@contesting.com
|