Star Micronics IFBD-HE07X - 3.1.11 TCP Keep-Alive

IFBD-HE0708 BE07 User’s Manual
3-29
3.1.11. TCP Keep-Alive
This product supports TCP Keep-Alive.
If TCP Keep-Alive is valid, TCP Keep-Alive operations are performed under the following conditions on the computer.
Item Value Factory Default Remarks
Setting ENABLE/DISABLE DISABLE
Disconnection timeout time Approx. 42 seconds Note 1
Note 1: If there is no response for this time from the computer, the printer forcibly disconnects the
connection (RST).
 This feature is applied to all TCP/IP communications ports.
 This feature is unrelated to the TCP#9100 data reception timeout.
The following is an example communication chart.
PC
SYN
SYN ACK
ACK
<DATA>
<DATA>
TCP Keep-Alive prove
TCP Keep-Alive prove
TCP Keep-Alive prove
TCP Keep-Alive prove
TCP Keep-Alive prove
RST
Printer (TCP Port)
Receive TCP Connection
Detect Timeout
Forced Disconnection
No Reception Data From PC
Start TCP Keep-Alive prove
No Response from PC (Approx. 42 Seconds
)
TCP Connection)
PC Problem Occurs Her
e
Note: In the drawing, description of the <ACK> packet has been omitted.