ICS-Series User Manual

User’s Manual of ICS-11x Serial Device Server Series
50
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 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 serial server. Just send CR, or LF, or do
not modify CR-LF character. The default is CR-LF.
 CR-LF
 CR
 LF