NPort IA5000A Series
Web Console Configuration
5-27
Dial-in
The NPort IA5000A listens for a TCP/IP connection request from the remote Ethernet modem or host. NPort
IA5000A’s response depends on the ATS0 value, as outlined below.
ATS0=0 (default):
The NPort IA5000A will temporarily accept the TCP connection and then send the “RING” signal out through the
serial port. The serial controller must reply with “ATA” within 2.5 seconds to accept the connection request,
after which NPort IA5000A enters data mode. If no “ATA” command is received, NPort IA5000A will disconnect
after sending three “RING” signals.
ATS0
≧
1:
The NPort IA5000A will accept the TCP connection immediately and then send the “CONNECT <baud>”
command to the serial port, in which <baud> represents the baudrate of the NPort IA5000A’s serial port. After
that, the NPort IA5000A immediately enters data mode.
Dial-out
The NPort IA5000A accepts the AT command “ATD <IP>:<TCP port>” from the serial port and then requests
a TCP connection from the remote Ethernet Modem or PC. This is where <IP> is the IP address of the remote
Ethernet modem or PC, and <TCP port> is the TCP port number of the remote Ethernet modem or PC. Once the
remote unit accepts this TCP connection, the NPort IA5000A will send out the “CONNECT <baud>” signal via
the serial port and then enter data mode.
Disconnection request from local site
When the NPort IA5000A is in data mode, the user can drive the DTR signal to OFF, or send “+++” from the
local serial port to the NPort IA5000A. The NPort IA5000A will enter command mode and return “NO CARRIER”
via the serial port, and then input “ATH” to shut down the TCP connection after 1 second.
NOTE
The “+++” command cannot be divided. The “+” character can be changed in register S2, and the guard
time, which prefixes and suffixes the “+++” in order to protect the raw data, can be changed in register S12.
After the TCP connection has been shut down by the remote Ethernet modem or PC, the NPort IA5000A will
send the “NO CARRIER” signal via the serial port and then return to command mode.
AT Commands
The NPort IA5000A supports the following common AT commands used with a typical modem:
No. AT command
Description
Remarks
1
ATA
Answer manually
2
ATD <IP>:<Port>
Dial up the IP address: Port No.
3
ATE
ATE0=Echo OFF
ATE1=Echo ON (default)
4
ATH
ATH0=On-hook (default)
ATH1=Off-hook
5
ATI, ATI0, ATI1, ATI2
Modem version
reply “OK” only
6
ATL
Speaker volume option
reply “OK” only
7
ATM
Speaker control option
reply “OK” only
8
ATO
On line command
9
ATP, ATT
Set Pulse/Tone Dialing mode
reply “OK” only
10
ATQ0, ATQ1
Quiet command (default=ATQ0)
11
ATSr=n
Change the contents of S register
See “S registers”
12
ATSr?
Read the contents of S register
See “S registers”
13
ATV
Result code type
ATV0 for digit code
ATV1 for text code
0=OK
1=connect (default)
