User’s Manual of ICS-2x00T Serial Device Server Series
51
4.5.2.4 Serial Telnet mode
Telnet (TELecommunication NETwork) is a network protocol used on the Internet or local area network (LAN) connections. The
Telnet protocol type is the correct setting for most servers and serial devices, such as Managed Ethernet switches or Gateways.
In the case of a Telnet session, the process is reversed, where the connected server reads and writes data to RS-232 serial port.
Once the serial Telnet application is enabled, the industrial serial server will interact with these special CR/LF commands. The
serial telnet mode topology in
Figure 4-5-9
appears.
Figure 4-5-9:
Serial Telnet Mode Topology
The serial Telnet mode screenshot in
Figure 4-5-10
appears.
Figure 4-5-10:
Serial Telnet Mode Screenshot
Object
Description
•
TCP Keep-alive
Interval
TCP keep alive interval shows how many seconds the unit waits during an inactive
connection before checking its status. If the unit does not receive a response, it will drop
that connection. The default is 0 minute.
•
Quiescent Time
When the network connection is determined to be idle, the duration of the control
network inactivity will cause the connection to be forced closed. The range of value is
from 1 to 65535 ms. The default is
0 ms
•
Local TCP port
This parameter describes the TCP port that communicates with the connected device.
The setting slave and master destination IP parameters must use the same value to
achieve communication. The range of value is from 1 to 65535. The default is
5004
for
port 1,
5005
for port 2,
5006
for port 3 and ,
5007
for port 4
•
Translate CR-LF
Enter CR-LF characters can be processed after industrial serial server. Just send CR, or
LF, or do not modify CR-LF character. The default is
CR-LF
.
CR-LF
CR
LF
