NXU-2A Operations Manual
Interoperability Now! 4-3
Note: If data is to be transferred across the IP link, the NXU-2A serial port
must not be in the Command Mode (see Section 3.3.1). Be sure to return the
unit to the Transparent Mode (by issuing a TRAN command) if you have placed
the unit in Command Mode.
4.4.5 Auxiliary I/O
The NXU-2A has two sets of independent inputs and outputs that may be used for control of
the user’s equipment. AUX IN 0 and AUX IN 1 are active-low inputs which, when activated on
one end, will cause AUX OUT 0 and AUX OUT 1 on the other end to become active. The
AUX OUT lines are open drain devices and each is capable of sinking 100 mA. Note: the
auxiliary I/O lines are designed for switching and control applications, and do not have quick
enough response times to send or receive data.
4.5 Controlling Connections
Normally the NXU-2A client automatically connects to the preprogrammed NXU-2A server
when power is applied. The user may also manually control the connection state of the NXU-
2A client. This can be done via the serial port (by entering command mode as described in
Section 3.3.1) or via the network using Telnet or a Web Browser.
4.5.1 Serial or Telnet Control
When using the serial port (in command mode) or Telnet, the user may disconnect a client from
a server by typing:
DISC
A connection may be made to a server by typing:
CONN <IP address>
The status of these commands may be viewed by typing:
STAT
STAT returns the following responses:
CON <IP address> The unit is connected to an NXU-2A at address <IP address>
DIS The unit is not connected
ATT <IP address> The unit is attempting a connection to <IP address>
Depending upon the characteristics of the network, the CONN and DISC commands may not
take effect immediately. In order to determine when a CONN or DISC command has
completed, issue the STAT command repeatedly to poll the status of the connection.
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