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5.6.2.3
USDG Control Mode
In controlling mode, the EKI device presents a modem interface to the attached serial
device: it accepts AT-style modem commands to connect/disconnect to other net-
working device. If you want serial device running application program to connect/dis-
connect to different devices dynamically, you can use controlling mode.
The "Control mode" provides three kinds of modem AT-style commands. The serial
devices can use these commands to control the EKI device to connect/disconnect to
remote networking device. Thus, intelligent serial devices such as standalone PLC
will send/receive data to/from devices one by one via Ethernet.
Please refer to the USDG Data Mode to setup the Data Listen Port, Command Listen
Port, and Data Idle Timeout.
Hangup Character
The default character is "+". After you have connected to another serial device
via EKI device, you may need to disconnect. Then you can use the command
"+++" to disconnect. To do this leaves your keyboard idle (don't press any keys)
for at least several seconds, then press "+" three times. You can set "Guard
Time" to define the idle time. Be sure that you have to press "+" over the idle
time.
Guard Time
The default value is 1000 ms.
Example: <Guard Time>+++<Guard Time>
Control Mode is designed for use with legacy operating systems, such as MS-
DOS, that do not support TCP/IP Ethernet. By connecting one of EKI's serial
ports to the MS-DOS computer's serial port, it is possible to use legacy software
originally designed to transmit data via modem, but now transmit the data over
the Ethernet.
Dial-in (Use TCP connect to serial port of EKI)
EKI listens for a TCP/IP connection request from the remote host. when a TCP
connection is coming, there will have prompt string "RING" shows on serial port
site. After the system prompting the "RING" string, user can use "ATA" com-
mand to accept the connection or just ignore it. After accepted the connection,
EKI will enter data mode.
Dial-out (From serial port connect to specific TCP host target)
User can user the AT Command "ATD <IP>#<TCP port>" to connect to a spe-
cific TCP target host from serial port. when the TCP connection is accepted by
the remote host, EKI will show "CONNECT" string to serial port and enter data
mode.
EKI-1361/EKI-1362 User Manual
54
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