11-15-2008
Programming serial port
Hello!
Can someone advice me which method I will use if I want to communicate with device via RS232 serial port with this requirements:
1. Serial port is opened in non-canonical mode.
2. All the time I need to check is there something to read.
3. If I have to write something I need to write it immediately.
4. Overhead of CPU have to be minimum.
Thanks!
Jvrlic
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LEARN ABOUT DEBIAN
cyclades-devices
cyclades-devices(5) cyclades-devices(5)
NAME
cyclades-devices - tables for driving cyclades-serial-client
DESCRIPTION
The cyclades-devices file supplies all mapping between Unix device files (/dev/*) and the addresses of serial ports of Cyclades Terminal
Servers. It contains one entry for each serial port, with the following format:
device:rastype:rasname:physport:type:options
Note: A # character at beginning of line indicates a comment
The entry fields are:
devname
- A full pathname of the file that will be associated to the serial port. It must start with a "/dev/" preffix. Two naming schemes
may be used here: - devname does not exist, and will be linked to a free pseudo-tty. This is the default behavior of cyclades-ser-
cli. - devname is the name of a valid slave pseudo-tty. In this case, the '-t 1' option must be assigned in options field. (Note:
this option is not supported by this release).
rastype
- Terminal Server type: - prts, for Cyclades Pr302X/TS Terminal Servers. - path, for Cyclades PathRAS Terminal Server.
rasname
- Host Name or IP Address of the Terminal Server where the serial port resides.
physport
- Number of physical port in the Terminal Server. If treated as the IP address associated with this port, in a IP-based addressing
scheme.
type - Server type that will be contacted to handle the serial port: - rtelnet, for Remote Telnet Server - socket, for Socket Server
options
- Per-port specific options, passed to cyclades-ser-cli program.
EXAMPLES
1. Device on a PR3020/TS Terminal Server pr3k Port 1, accessed through /dev/ctty01 device file name, using telnet protocol (remote telnet
server)
/dev/ctty01:prts:pr3k:1:rtelnet:
2. The same device, but with an IP address pr3k_port1 associated to the serial port (IP-based port addressing)
/dev/ctty01:prts:pr3k_port1:0:rtelnet:
3. Device on a PathRAS Terminal Server pr3k Port 2, accessed through /dev/ctty02 device file name, using socket protocol (socket server)
/dev/ctty02:path:pr3k:2:socket:
FILES
/etc/cyclades-devices This file
SEE ALSO
cyclades-serial-client(1), cyclades-ser-cli(1)
cyclades-devices(5)