XLR PRO operational design
XLR PRO Radio Frequency (RF) Modem User Guide
22
•
4T
: RS-485/422 termination. Enable or disable line termination on the RS-485/422 interface. The default value of 0
indicates that there is no line termination on the XLR PRO. If 4T is set to 1, then a 120
termination resistor will be
present on the RS-485/422 connection. This parameter will have no effect on the XLR PRO if it is configured for RS-
232.
IP socket mode
IP socket mode provides serial communication for a single TCP or UDP port on the XLR PRO (multiple simultaneous
connections are not supported). This would normally happen over the Ethernet connection, but it may also occur
over the bridge if Ethernet RF bridging is enabled and another XLR PRO (which also has Ethernet RF bridging enabled)
provides the Ethernet connection to an IP host. With the factory default settings, the XLR PRO listens on port 9750 for
incoming TCP traffic. A telnet session can be initiated to the XLR PRO’s IP address as a simple IP socket connection.
The same operations that can occur in serial mode can also occur in IP socket mode. Those operations are based on
the payload of the IP frames. In other words, serial data coming to and from the XLR PRO is equivalent to the payload
of the IP socket mode data.
Controlling parameters
IP socket mode is configured by these parameters:
•
IB
: IP socket mode baud rate. This is set to the maximum rate of 460800 b/s by default, but it may be set to a lower
rate for throttling, if desired.
•
IP
: IP protocol. Default value of 1 selects TCP and 0 selects UDP. This parameter must match the protocol used by
the IP host.
•
C0
: TCP or UDP port on which the XLR PRO listens. The IP host must send data to this port for the XLR PRO to
accept the incoming data. If configuring the XLR PRO using XCTU, the port number is displayed in hexadecimal.
•
DY
: Destination IP port. (See
DX
.)
•
DX
: Destination IP address. Tells the XLR PRO where to send data if it initiates the conversation. If operating in TCP
mode and a TCP connection does not currently exist, then the XLR PRO attempts to make a connection to this IP
address (and the IP port given by
DY
) to send the data to the selected IP host and port. However, if a TCP
connection already exists, then the data is sent to that connection, ignoring the
DX
and
DY
parameters. If
operating in UDP mode, this rule changes slightly because it is a connectionless protocol. If the first IP socket
mode data comes from the XLR PRO, then
DX
/
DY
is used. If not, then all UDP data is sent to the IP address and port
from which the original data arrived.
•
TM
: TCP client connection timeout. A client connection is one which was initiated by the XLR PRO. This parameter
tells how many seconds a TCP client connection remains connected when no data is being sent or received on the
connection.
•
TS
: TCP server connection timeout. A server connection is one which was initiated by an external IP host. This
parameter tells how many seconds a TCP server connection remains connected when no data is being sent or
received on the connection.
In addition to the above IP socket mode parameters, the
MY
parameter is also used in IP socket mode:
•
MY
: IP address of the XLR PRO. By default, this address is learned from a DHCP server, but it may be set to any
value if static mode is used (
MA
=1).
Operational description
IP socket mode may start up in the following cases:
•
Reset:
Based on the mode selection rules previously described.
•
Configuration parameters:
Parameters that affect the mode are changed and applied.
•
Unplugged cable:
An RS-232 cable is unplugged.
When IP socket mode is the primary interface, the Serial Data Out (yellow) LED lights for about three seconds.