Ticket #39187

Hardware Flow Control

Open Date: 2019-05-03 09:14 Last Update: 2021-04-29 06:07

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5 - Medium
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Details

Hardware flow control in serial port setup does not work. Using CTS and RTS. I have tested this with other terminal programs including Hyperterminal and it is working. Something is wrong with Teraterm.

Ticket History (3/11 Histories)

2019-05-03 09:14 Updated by: ckeays
  • New Ticket "Hardware Flow Control" created
2019-06-06 19:10 Updated by: ckeays
Comment

Reply To ckeays

Hardware flow control in serial port setup does not work. Using CTS and RTS. I have tested this with other terminal programs including Hyperterminal and it is working. Something is wrong with Teraterm.

no response?

2019-06-07 19:49 Updated by: (del#24082)
Comment

Hi ckeays,

I am sorry for the inconvenience caused.
I have some question.

Q1. What cable do you use? FTDI(genuine)?
Q2. What adapter do you use? CH340G USB serial converter?

I am looking forward to hearing from you.

2019-06-07 21:44 Updated by: ckeays
Comment

Reply To yutakapon

Hi ckeays,

I am sorry for the inconvenience caused.
I have some question.

Q1. What cable do you use? FTDI(genuine)?
Q2. What adapter do you use? CH340G USB serial converter?

I am looking forward to hearing from you.

>

Yes i have tried a genuine FTDI cable, a CH340G installed on an atmega development board, and just regular DB9 serial port straight through cable connected to a real serial port on my computers' motherboard. None of them are working with Teraterm hardware flow control, however they all work with other terminal programs that support hardware flow control.

I have tested only in windows 32 bit and 64 bit systems.

2019-06-07 21:50 Updated by: (del#24082)
  • Owner Update from (None) to yutakapon
2019-06-08 12:42 Updated by: (del#24082)
Comment

ckeays への返信

Thank you for your information.
It seems that your problem is not Tera Term but USB driver problem.

I do not know root cause of your problem. However, I
found a suspicious place in the source code. I am not sure,
but I think the device driver of CH340G has any problem because the
flow control of Tera Term has not changed for a long long time.
So, I fixed the place experimentally.
Would you please test by using below archive if your problem is
reproduced?

https://ja.osdn.net/projects/ttssh2/storage/snapshot/snapshot-r7741-20190607-yutaka-hardware_flow.zip
I am looking forward to hearing from you.

2019-06-11 20:06 Updated by: (del#24082)
  • Component Update from (None) to Tera Term
2019-07-09 19:47 Updated by: (del#24082)
Comment

Hi ckeays,

I apologize for the urgency, but I am still expecting your respoinse regarding my archive testing.

Please let me know if you have any questions.

2019-12-10 19:02 Updated by: (del#24082)
  • Owner Update from yutakapon to (None)
2021-04-29 03:42 Updated by: None
Comment

Reply To (del#24082)

Hi ckeays, I apologize for the urgency, but I am still expecting your respoinse regarding my archive testing. Please let me know if you have any questions.

Hi,

I would like to report the same issue, HW flow control does not seem to work in 4.105, while it does work with same PC and same USB device & cable with other programs.

Can I help to try a fix? Otherwise TeraTerm is exactly what I need, a great program!

P

2021-04-29 06:07 Updated by: ckeays
Comment

Reply To ckeays

Hi ckeays,

I apologize for the urgency, but I am still expecting your respoinse regarding my archive testing. Please let me know if you have any questions.

No. the hardware flow control does not work with an RS232 (DB9) serial port. I did get it to work with a USB to TTL CH340 device. Other terminal programs are working with the DB9 serial port and USB to TTL devices, (as mentioned previously). I tried 4 different versions of Teraterm all the way back to version 2.3, the problem still exists.

Are you using different flow control pins for the DB9 RS232 port other than CTS and RTS? Remember I am connection to a real serial port not USB converter.

(Edited, 2021-04-29 06:47 Updated by: ckeays)

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