P3 - Pakscan Master Station Technical Manual
104 of 136 Publication PUB059-002-00 Issue 06/15
Cross-Connected: Either Yes or No, indicating the status of the cross connect DIP switch on
the back plane. A system using RS-485 communication and a Hot Standby
pair should be set to ’Cross-Connect’ and display ‘Yes’.
Physical Interface: Either RS-232 or RS-485, showing the switch setting for the physical
interface from the CPU module.
Ethernet Port
Standby Mode : The performance of the port when the CPU module is in standby mode is
set by this drop-down box. The Ethernet Port should be set as Passive if
the system includes a hot standby CPU to avoid conflicts in
communications.
When the port is set to ‘Active’ it will respond to incoming messages with a
reply, when set to ‘Passive’ it will not reply.
Note that a CPU in main mode is active and always replies to incoming
messages.
IP Authentication : The two IP addresses that can be set here are to do with system access
permission. When controlling the system via Ethernet and Modbus TCP, it
is possible to increase the system security and only permit access from
specified IP locations. If both the values set here are 0.0.0.0 then any IP
address can access the system.
When a specific IP address is entered in either IP Number 1 or IP Number
2, the system only allows access for Modbus messages originating from
those addresses. Note that all access, including Read only access, is
restricted by the entries.
Controls
Save Settings : Saves the settings for the ports. Until they are saved any alterations to the
settings will not take effect.
Modbus Message: Brings up the Modbus test screen where specific messages can be sent to
the system via the web page.
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