4RF Aprisa SR - Page 109

Managing the Radio | 107
Aprisa SRx User Manual 1.3.0
Mode
This parameter defines the mode of operation of the serial port. The default setting is Standard.
Option
Function
Disabled
The serial port is not required.
Standard
The serial port is communicating with serial ports on other
stations.
Terminal Server
A base station Ethernet port can communicate with both Ethernet
ports and serial ports on remote stations.
RS-232 traffic is encapsulated in IP packets (see ‘Serial > Port
Setup’ TERMINAL SERVER SETTINGS on page 108).
Baud Rate (bit/s)
This parameter sets the baud rate to 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600 or 115200 bit/s.
The default setting is 115200 bit/s.
Character Length (bits)
This parameter sets the character length to 7 or 8 bits. The default setting is 8 bits.
Parity
This parameter sets the parity to Even, Odd or None. The default setting is None.
Stop Bits (bits)
This parameter sets the number of stop bits to 1 or 2 bits. The default setting is 1 bit.
Flow Control
This parameter sets the flow control of the serial port. The default setting is Disabled.
Option
Function
None
The Aprisa SR radio port (DCE) CTS is in a permanent ON (+ve)
state.
This does not go to OFF if the radio link fails.
CTS-RTS
CTS / RTS hardware flow control between the DTE and the Aprisa
SR radio port (DCE) is enabled.
If the Aprisa SR buffer is full, the CTS goes OFF.
In the case of radio link failure the signal goes to OFF (-ve) state.
In terminal server mode, the serial packet is no different from an Ethernet packet and travels through
various packet queues before being transmitted over the air. Thus, the serial flow control has no affect in
terminal server mode.
Inter-Frame Gap (chars)
This parameter defines the gap between successive serial data frames. It is used to delimit the serial data
to define the end of a packet. The Inter-Frame Gap limits are 0.5 to 16 chars. The default setting is 3.5
chars.