Appendix B - Telnet (Terminal) Commands
99
Hardware Reference Manual – DXLink™ Twisted Pair Transmitters/Receiver
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 96).
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 96).
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 96).
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.
Notes on Specific Telnet Clients
Telnet and terminal clients exhibit different behaviors in some situations. This section states some of the known anomalies.
Windows Client Programs
Anomalies occur when using a Windows
®
client if you are not typing standard ASCII characters (i.e., using the keypad and the Alt
key to enter decimal codes). Most programs will allow you to enter specific decimal codes by holding Alt and using keypad numbers.
Example
For example, hold Alt, hit the keypad 1, then hit keypad 0, then release Alt. The standard line feed code is entered (decimal 10).
Windows will perform an ANSI to OEM conversion on some codes entered this way because of the way Windows handles languages
and code pages.
The following codes are known to be altered, but others may be affected depending on the computer’s setup.
Characters
15, 21, 22
, and
any characters above 127
.
This affects both Windows Telnet and Terminal programs.
Linux Telnet Client
The Linux Telnet client has three anomalies that are known at this time:
A null (\00) character is sent after a carriage return.
If an “Alt 255” is entered, two of the “255” characters are sent (per the Telnet RAFT).
If the code to return to Command mode is entered (Alt 29 which is CTRL+]), the character is not sent, but the Telnet
Command Mode is entered.
