Communications
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4–1
4
Communications
4.1 This chapter
This chapter deals with the way PCNC communicates with the devices
on the network. It explains the difference between local, remote and
auxiliary devices, and how to connect to them using the Terminals.
An optional feature of PCNC is the SNMP link, for use with devices on a
TCP/IP network. For details, see Chapter 5.
4.2 Connections
In order to receive alarms and send commands to network devices,
PCNC uses both hardware and software connections - ports and Links.
The ports are the COM ports on the back of your computer, which
connect to the network. Links are internal software components that
transfer information between PCNC and the ports.
4.2.1 Local Devices
Devices that communicate directly with your PC (via port sharers and
serial lines) are known as ‘local’. They are connected to the Control port
and use the Control Link, which can gather alerts and send commands.
4.2.2 Remote Devices
KBU 64 devices that are not connected in this way can send alert
messages to PCNC through ISDN lines. The messages are forwarded
