Advantech EKI-1511L, User Manual

Page: 48 / 87

EKI-1511L User Manual 37
4.4 USDG Control Mode
In controlling mode, the EKI-1511L device server presents a modem interface to the
attached serial device: it accepts AT-style modem commands to connect / disconnect
to other networking device.
If you want a serial device running application program to connect/disconnect to
different devices on request, this function is available through the USDG Control
mode.
Figure 4.7 USDG Control Mode
4.4.1 Hangup Character
The default character is “+”. After you have connected to another serial device an via
EKI-1511L device, you may need to disconnect, using the command “+++”. To do
this, press “+” three times and wait for the Guard timeout <default value is 1000ms>;
the device will disconnect. You can set “Guard Time” to define the idle time.
4.4.2 Guard Time
The default value is 1000 ms.
Example: <Guard Time>+++<Guard Time>
Command Function
ATD <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-1511L device server forms
a raw TCP connection to the networking device
(192.0.55.22). The TCP port is 5201.
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
<LF><CR> RING ddd.ddd.ddd
<LF>< CR> Detect the connection request from other device,
which IP address is ddd.ddd.ddd.ddd.