Axel AX4000 User's Manual - Manual (Page 33)

Setting-Up the Office Server in Interactive Mode
AXEL Office Server
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Note: to use the axttyd Unix daemon, set the service as follow:
- ID string: y
- Auto Connection: yes
- time-out: 0
b - Server Tty
Select [Serial Lines] →[Line X]→[Network Service] and enter the following
parameters:
- Service Mode: enter the keyword ‘server',
- Service Type: enter the keyword ‘tty',
- TCP Port: numeric value associated with this Office Server serial line.
- TCP Keepalive Timeout: the keepalive mechanism allows the Office
Server to regularly check its TCP/IP connection status.
IMPORTANT: please, read appendix A.8 to set-up the keepalive
mechanism and to understand consequences of the keepalive use
(especially for routers).
2.5.4 - Any Devices on Windows
a) Presentation
The Office Server serial port can be controlled as standard operating system
local COM ports. Any software can use standard O.S. commands to control
these "virtual COMs":
- to send or receive data,
- to set serial line parameters (baud rate, parity, etc),
- to set serial output signals (DTR and RTS),
- to get serial input signals (DSR, CTS and CD).
IMPORTANT: the difference between virtual COMs and real COMs is the
reaction time. Due to the network latency, delay can be observed between a
serial port operating system operation and its achievement at the Office Server
serial port level. And if software uses short timer, error processing could be
reported with the virtual port.
This virtual COM control is based on a telnet protocol extension: RFC 2217
(RFCs can be consulted at ftp://ftp.merit.edu/documents/rfc/).