American Fibertek Net I/O N-664 - Manual (Page 19)

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An option is available to only permit incoming TCP/IP connections from a specific
source. If the user specifies an IP address for a server mode port, only connections
from that port will be accepted.
Serial Client Mode
In Serial Client mode, the N-664 will actively attempt to connect to a pre-defined server
device over the network. When a valid IP address and target port are set through the
configuration screen, the N-664 will attempt to open a TCP/IP connection to that
address. Once a connection is made, serial data received on that hardware serial port
will be transmitted to the target server device, and data returned by the target server
device will be returned to the hardware serial port.
Data flow between the hardware port and the TCP/IP connection is bidirectional. The
rate at which data on the RS232 port is transmitted and received can be set through the
configuration web page. If the port is configured as an RS232 or 4 wire RS485 data flow
may be synchronous. A port configured as 2 wire RS485 must operate asynchronously,
where data reception will be inhibited while data is being transmitted out by the port.
Each serial port can only send data to a single target server address at once. If the
connection to the target server is lost, the N-664 will immediately attempt to reconnect.
If the reconnect attempt fails, the N-664 will retry every 60 seconds afterwards to re-
establish the connection.
Alarm input forwarding
The N-664 has six contact inputs which can be connected to customer supplied contact
closure devices such as motion detectors or door switches. These alarm inputs can be
linked through the N-664 to trigger aux contact outputs on that device, or another N-664
device or other VNES devices elsewhere on the network.
The conditions which will be considered an alarm can be set through the configuration
web page. Thus the N-664 can be used with alarms where a contact is broken (such as
a wire break or emergency stop switch) or where a contact is made (such as a motion
detector). The minimum duration that the contact must be made or broken before an
alarm is registered can also be set by the user, so that the user can set an alarm to
trigger only if an alarm condition has been present for a certain amount of time.
When an alarm is triggered, the N-664 can be set to activate aux output contacts either
on that same N-664, or on other N-664 or VNES devices on the network. The user can
set which output to set and whether to turn it on or off in response to the triggered alarm.
The user can also set the target aux contact out to be set on or off for a specific duration
in response to a local alarm condition. Alternately the user can set the target aux
contact out to be set on or off indefinitely in response to a local contact, so that a local
contact will cause an aux out to be set or cleared until some other trigger clears or sets
that aux output.
The permitted targets of aux contact actions to be taken in response to local alarms are
any N-664 devices, or any other compatible VNES device, such as a C10 Commander,