# Tips on ZMODEM

The ZMODEM protocol implemented in Tera Term does not support 7 bit communication lines.

## For serial port:

Set the appropriate parameters in the [Setup] Serial port dialog box. Data must be 8 bit.

## For telnet:

If file transfers fail, try to escape all control characters. If that does not work, try connecting to the host with the binary option. To connect with the binary option:

- Specify the /B option on the command line, or
- Edit the setup file.
  Telnet binary option

Setup items for ZMODEM:

- Auto activation of ZMODEM Receive
  Note: If this option is turned on, file sending may not work.
- ZMODEM parameters for sending

Reference: Transfer the file via the intermediate server

## Communication software

The ZMODEM file transfer will work well for the lrzsz package on the Red Hat Linux(e.g., Fedora, CentOS). The transfer may not work well for the zmtx-zmrx package.
When a user uses the com0com software, Tera Term can use loopback test with another Tera Term and Hypter terminal.

Modem communication program

- lrzsz
- zmtx-zmrx
- Null-modem emulator(com0com)