Appendix B - Telnet (Terminal) Commands
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Hardware Reference Manual – DXLink™ Twisted Pair 4K Transmitters/Receivers
Master Connection Modes
The mode of communication used for connection to the Master is specified via the SET CONNECTION Telnet command (see
page 72).
Connection mode setting options are AUTO, TCP URL, UDP URL, or NDP (default) as described:
AUTO
– This mode utilizes TCP communication. It looks for a matching System Number and attempts to come online with
the first Master it sees with that System Number.
TCP URL
– TCP; the Master is specified via URL.
UDP URL
– UDP; the Master is specified via URL.
NDP
– UDP; this mode utilizes the NDP binding process to assign the DXLink Module (the physical device) to a Master
(or Virtual Master) via NetLinx Studio. Once bound, communications are conducted via UDP.
NOTE:
In URL modes, the Master can use either an IP address or a DNS name.
Guidelines
UDP mode is recommended for the following types of installations:
Small-to-medium residential and corporate installations on a single subnet
Segmented control network installations (control network is a separate switching domain and subnet from other network
equipment)
Installations with the total number of NetLinx / ICSNET devices on a single Master exceeding 128
TCP mode
is recommended for installations where (a) the switching domain of the network is subject to “bursty” traffic or heavy
streaming activity (>20 Mbps consumption by streaming) and where (b) the total number of NetLinx / ICSNET devices on a single
Master is less than 128.
TCP vs. UDP
TCP – Protocol has a built-in retry mechanism.
UDP – Protocol does not have a built-in retry mechanism, but consumes fewer resources on the Master. AMX’s UDP
implementation of NetLinx employs a retry mechanism to provide the reliability of TCP with the resource efficiency of UDP.
URL vs. NDP vs. Auto
Determining which connection method to use for Master Connection Mode is essentially a matter of deciding what information the
device should use to identify the correct Master to connect to.
The default mode is NDP; the mode can be changed via the
SET CONNECTION
Telnet command (see page 72).
URL
– The device connects to the Master with the specified URL. The device must be configured with the URL of a specific
Master via the
SET CONNECTION
Telnet command (see page 72).
NDP
– The device connects to the Master it’s been bound to, which is based on the Master’s MAC address. The binding is
configured via NetLinx Studio. Once bound, the device must be unbound using either NetLinx Studio or the Telnet
NDP UNBIND
command before being re-bound to a different Master.
Alternatively, NDP devices can be bound/unbound via options on the Master’s Web Configuration pages (System > Manage
NetLinx). For details, refer to the
WebConsole & Programming Guide – NX-Series Controllers
(System - Manage NetLinx
section).
Auto
– The device connects to the first Master it finds with the specified System Number.
The device must be configured with the desired system number via the
SET CONNECTION
Telnet command (see page 72).
Use of this method requires that only one Master has any particular system number and is visible to the subnet. If this is the case,
then Auto is the simplest choice. However, with Auto, you are not hard-bound to a particular Master. Therefore, if at some point in
the future, another Master is configured with the same system number, the result is that the DXLink Module could show up on that
other Master.
SHOW LOG
Displays the message log.
Syntax:
SHOW LOG <start>
Specifies the message number to start displaying.
SHOW LOG <all>
or
SHOW LOG
Displays all messages.
SHOW VS100 STATS
Displays DXLink transport information (MSE values, length, etc.).
Telnet Commands
