Open Date: 2010-07-02 12:57
Last Update: 2011-08-28 21:26
XMODEM send problem
Ticket History - 3/14 Histories [Show all old Histories]
2010-07-02 12:57 Updated by: maya
2010-07-02 13:10 Updated by: ldy2534
2010-07-02 13:13 Updated by: ldy2534
2010-07-02 13:29 Updated by: maya
submitted by ldy2534 at 2010-07-02 12:10 ID: 4376 description all_NG.bin : recode the data Tera Term send and ACK I response, NG version all_OK.bin : same environment I send data use secureCRT, OK recv_NG.bin: recode the data that Tera Term sended.
2010-07-02 14:44 Updated by: ldy2534
Could you please attach log files too? To enable log, XmodemLog=on in teraterm.ini.
2010-07-02 15:10 Updated by: maya
sorry about bother you , I got information from your log, I'm sure that you are right. I'm wrong, but I still not find the reason.
2010-07-02 15:38 Updated by: ldy2534
How the *.bin files are recorded?
If you set XmodemLog=on and send a file with XMODEM, 'xmodem.log' is saved in teraterm directory. Please let us see the xmodem.log.
2010-07-02 16:20 Updated by: maya
Reply To maya
I have set XmodemLog=on , and I got the xmodem.log. and I analyse the xmodem.log, the result the Tera Term is right, There must have some error happen to my program . Thank you , please close this problem.
I got it. Thanks.
2010-07-02 17:04 Updated by: ldy2534
2010-07-02 17:17 Updated by: ldy2534
hi. I still have some confuse. 1. At first I will send NAK to Tera Term 2. I chose the file I want to send , but it will take some time, you know I wll resend the NAK after 3second timeout, you will see in the log I send three NAK to you . there are two NAK after you send the first packet, but I believe the two NAK is not the packet's response. is't it.
I think perhap you can't receive the NAK when I chose the target file which I want to send.Is there something wrong.
2010-07-02 17:24 Updated by: ldy2534
2010-07-04 12:57 Updated by: maya
2011-01-18 06:36 Updated by: None
2011-08-28 21:26 Updated by: yutakapon
recently I also noticed some problems with X-Modem/CRC, when I tried to download a firmware update file to an embedded device. With Hyperterminal this problem did not occur. So I analyzed the problem, and I assume it has to do with the time needed for processing the data in the embedded device and the time out of Teraterm, until the packet is resent again! Let's make it clear by an example. Teraterm sends the first packet, the embedded device controller has to store this data in its flash memory (this time varies from device to device and may take some 1/100 seconds ). After this the controller sends an ACK to Teraterm. If the ACK does not appear within a certain time, teraterm resends the packet. When the controller has finished the storage of the received data, it listens again on the serial line. So the controller will not hear the correct start of the package and not-acknowledge this packet with the same ID.
Is there a way to tune the time-out before Teraterm resends the package?
下記フォーラムでパッチが上がっており、本件の修正につながる可能性あり。 4.72 ターゲットで取り込む。
why the first xmodem packet been always send out twice? http://logmett.com/forum/viewtopic.php?f=2&t=354
Add Comment/Update #22342 (XMODEM send problem)