TELIX was a popular terminal program that supported this. Zmodem actually defined a flag sequence, so that when the host started a transfer, terminal programs that supported the automatic start would begin the transfer. The hope was that the terminal program and the host computer would establish their place in the protocol and transfer the file. Then on the terminal program, you'd activate the transfer protocol option. So one would start the transfer program on the host, and it would start its protocol handshaking. XModem / YModem over CAN (without CANopen) In devices without CANopen, the same pair of CAN identifiers (one for RX, one for TX) normally used to load the display application into the terminal can also be used for the XMODEM file transfer. Once you are connected, and are ready to ymodem the file. The channel that the files were sent over were the actual login session. To send files back, one of several protocols could be used, kermit, xmodem, ymodem and zmodem. I'm sure this is a case of inexperience and I'm missing something obvious, but how can I fully execute this file transfer from start to finish / what am I doing wrong? Rz and sz date back to the days when people used to dial into modems attached to larger computer systems and login. The device has a command which tells it to anticipate a file transfer I believe this takes the place of rz, but the device documentation says it 'Prepares the device for YMODEM transfer via HyperTerminal.' I've sent it the files via HyperTerminal and a proprietary program successfully, but I need to be able to do it on linux command line. I'm trying to upload a firmware file over serial connection to a device that requires YMODEM protocol, from a raspberry pi. A few random characters on the serial line after the file is transferred. PuTTy on Windows does not support zmodem, xmodem, etc. Other examples talk about sending from a remote host to a local host via sz by default, but that's as deep as any explanation goes. How do I determine if it is sending to the device? It is plugged in via USB and has port /dev/ttyACM0.

I've read through the sz documentation and it leaves me with a question. I've already managed to just communicate with the device using example, but I'm having no luck with sz. After a lot of digging, I keep finding that the sz -ymodem command is the tool to do this.

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