[WriteLog] Writelog and Japan Radio JST-245 HELP!

2000年11月22日 23:56:49 EST

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>>
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