User guide
Serial Configuration
Rev 1 Oct.13 223
Table 11-1: Serial Port Configuration > Port Configuration
Field Description
Port Configuration
Startup Mode Default Default power-up mode for the serial port. When the AirLink device is power-cycled, the
serial port enters the communication mode specified.
Note: It can take up to 5 minutes to establish a connection.
• Normal (AT command) default
• PPP
• UDP
• TCP
• Reverse Telnet/SSH—Allows you to telnet or SSH into a router or other device
connected to the AirLink device via a serial port. For information on configuring
reverse telnet, see Reverse Telnet/SSH on page 224.
• Modbus ASCII
• Modbus RTU (Binary)
• BSAP—Bristol Standard Asynchronous Protocol
• Variable Modbus
• UDP Multiple Unicast—Data from the serial port is packed into UDP packets and sent
to multiple IP addresses (for example, multiple AirLink devices). For more information,
see UDP Multiple Unicast on page 227.
You can also use an AT command to configure this field. See MD on page 361.
Autologin reverse
telnet
This field only appears when the Startup Mode Default field is set to reverse telnet/SSH.
Determines the log in procedure when using reverse telnet.
• Enable—Do not enter a user name and password when you telnet to a a router or
other device that has a serial connection to your AirLink device. Login is automatic.
• Disable—Enter a user name and password when you telnet to a a router or other
device that has a serial connection to your AirLink device. (Default)
For more information about reverse telnet, see Reverse Telnet/SSH on page 224.
Configure Serial Port Format: [speed][data bits][parity][stop bits]
Valid speeds are 300–115200, data bits: 7 or 8, parity: O,E,N,M, stop bits: 1,1.5.
You can also use an AT command to configure this field. See S23 on page 370.
Flow Control Serial port flow control setting
• None—No flow control is being used (default)
• Hardware—RTS/CTS hardware flow control is being used
• Transparent SW—Transparent software flow control. Uses escaped XON and XOFF
for flow control. XON and XOFF characters in data stream are escaped with the @
character (0x40). @ in data is sent as @@.
You can also use an AT command to configure this field. See \Q on page 369.
DB9 Serial Echo AT command echo mode
• Enable—Text is visible as you type (default)
• Disable—Text you type is not visible
You can also use an AT command to configure this field. See E on page 368.