NPort 6000 Series Configuring Serial Port Operation Modes
Disconnection request from local site
When the NPort 6000 is in data mode, the user can initiate disconnection by sending “+++” from the local
serial port to the NPort 6000. Some applications allow you to directly set the DTR signal to off, which will also
initiate disconnection. The NPort 6000 will enter command mode, and after one second, you can then enter
“ATH” to shut down the TCP connection The NPort 600 0 will return a “NO CARRIER” via the serial port.
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.
Disconnection request from remote site
After the TCP connection has been shut down by the remote Ethernet modem or PC, the NPort 6000 will send
the “NO CARRIER” signal via the serial port and then return to command mode.
AT Commands
The NPort 6000 supports the following common AT commands as 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
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
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 (default)
0=OK
1=connect
2=ring
3=No carrier
4=error
14 ATZ
Reset (disconnect, enter command mode and restore the
flash settings)
15 AT&C Serial port DCD control
AT&C0=DCD always on
AT&C1=DTE detects connection by DCD on/off (default)
16 AT&F Restore manufacturer’s settings
17 AT&G Select guard time reply “OK” only
18 AT&R Serial port RTS option command reply “OK” only
19 AT&S Serial port DSR control reply “OK” only
20 AT&V View settings
21 AT&W Write current settings to flash for next boot up
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