• Serial Port Mode: The user can select one of four available modes for the serial port: GPS, RS232,
Debug, and Disabled.
o GPS: In GPS mode, an external serial GPS module can be connected to and powered from
the serial port of the radio. A gpsd service daemon running on the node will make the GPS
information available to any user on the network from TCP/IP port 2947. For more
information on gpsd please see: http://catb.org/gpsd/
In addition, GPS information can be pushed to the radio via the Ethernet or pulled by the
radio from a remote device. If using a remote device to obtain GPS, set the GPS mode to
remote, the GPS Server IP to the IP address of the remote device, and the Port. The radio
will try to connect via TCP to server on local subnet. It will expect data in GPSd format. If
GPS information is pushed to the radio via Ethernet, the radio will listen on specified port
and expect GPS data as NMEA Formatted UDP packets.
o RS-232: The RS-232 mode provides a wireless serial connection between any two serial
devices connected to StreamCaster radios on the network. In this mode, the user must
configure the RS-232 protocol parameters shown in Figure 35 Serial/USB Setup Page
above. The transport protocol for the serial data can be set as either TCP or UDP. For data
that is sensitive to latency such as command and control data, UDP is recommended. For
data that cannot tolerate any data loss, such as telemetry data, TCP is recommended.
▪ The Peer IP should be the IP address of the radio on the other end of the RS-232
communication.
▪ The Peer IP can be the native or virtual IP address, but must be consistent at both
ends.
▪ Baud rate must match the baud rate of data being sent from the device.
▪ Note – An additional ‘null modem’ cable may be needed at either end, depending
upon whether connected device is acting as a terminal or as a control (DTE or
DCE)
o Debug: The debug mode is used to gain terminal access to the StreamCaster radio and is
available for debug or interface purposes (API commands). The user’s terminal client
should be set to a baud rate of 115200 for console access to the radio.
o Disabled: This mode completely disables the serial terminal of the radio.
o Serial Relay: Usually used by UAV customers. This is the option when users want to
control the serial port with many clients.
• Apply: Apply the new values but does not save them to flash.
• Save and Apply: Save the new values to flash and apply.
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