43 EKI-1500 Series User Manual
4.4 USDG Control Mode
In controlling mode, the EKI-1500 Series device server presents a modem interface
to the attached serial device: it accepts AT-style modem commands to connect / dis-
connect to other networking device.
If you want a serial device running application program to connect/disconnect to dif-
ferent 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-1500 Series 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-1500 Series 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.
<LF><CR> DISCONNECT
<LF><CR>
Disconnect from other device
<LF><CR> ERROR <LF><CR> Incorrect commands
<LF><CR> FAIL <LF><CR> If you issue an ATDT command and can not connect
to the device, it will response “FAIL”.
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