When you troubleshoot issues with a serial device, there are some quick tests that you can complete to rule out potential problems. You can test to make sure that the following components are working correctly and are not the source of the issue:
To test your setup components, try the following:
When you test your cables, it is recommended that you do the following:
When you test the serial ports and serial device, it is recommended that you do the following:
Note: Some serial devices work only if the COM port number is between a certain range. For example, COM1 to COM4.
The tty0tty directory tree is divided in:
module - linux kernel module null-modem
pts - null-modem using ptys (without handshake lines) Null modem pts (unix98):
When run connect two pseudo-ttys and show the connection names:
(/dev/pts/1) <=> (/dev/pts/2)
the connection is:
TX -> RX
RX <- TX Module:
The module is tested in kernel 3.10.2 (debian)
When loaded, create 8 ttys interconnected: Best usb memory stick for music.
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/dev/tnt0 <=> /dev/tnt1
/dev/tnt2 <=> /dev/tnt3 /dev/tnt4 <=> /dev/tnt5 /dev/tnt6 <=> /dev/tnt7
the connection is:
TX -> RX
RX <- TX RTS -> CTS CTS <- RTS DSR <- DTR CD <- DTR DTR -> DSR DTR -> CD Requirements:Virtual Null Modem
For building the module kernel-headers or kernel source are necessary.
Installation:
Download the tty0tty package from one of these sources:Clone the repo https://github.com/freemed/tty0tty
Extract it
Build the kernel module from provided source
Copy the new kernel module into the kernel modules directory
Load the module
You should see new serial ports in
/dev/ (ls /dev/tnt* )Give appropriate permissions to the new serial ports
You can now access the serial ports as /dev/tnt0 (1,2,3,4 etc) Note that the consecutive ports are interconnected. For example, /dev/tnt0 and /dev/tnt1 are connected as if using a direct cable.
Persisting across boot:
edit the file /etc/modules (Debian) or /etc/modules.conf
and add the following line:
Note that this method will not make the module persist over kernel updates so if you ever update your kernel, make sure you build tty0tty again repeat the process.
Debian package
In order to build the dkms Debian package
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