User manual

EKI-1521/1522/1524 User Manual 38
networking device. If you want serial device running application program to connect/
disconnect 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-152X series to connect/discon-
nect 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 Data Mode (USDG Mode) to setup the Data Listen Port, Com-
mand Listen Port, and Data Idle Timeout.
Hangup Character
The default character is “+”. After you have connected to another serial device via
EKI-152X series, 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> + <Guard Time> +
The following commands are available for EKI-152X series.
Table 3.1: AT Command List
Command Function
ATDT<IP address> <TCP port>
<CR>
“Forms a TCP connection to the specified host.
Ex: ATDT 192.0.55.22:5201
In above example, the EKI serial device server forms
a raw TCP connection to the networking device
(192.0.55.22). The TCP port is 5301.”
ATA <CR> Answering an incoming call
+++<CR> Returns the user to the command prompt when
entered from the serial port during a remote host con-
nection.
<LF><CR> OK <LF><CR> Commands are executed correctly
<LF><CR> CONNECT <LF><CR> Connect to other device