7. Internal Web pages
Issue 06/15 Publication PUB059-002-00 103 of 136
The host port configuration page allows the settings for the serial and Ethernet ports to be made. The
two serial ports (ports 1 and 2) are independent from one another whilst the Ethernet ports (ports 3
and 4) are linked together.
Host Port 1
Baud Rate : This drop-down box allows the communication speed (baud rate) for the
serial port to be selected. The choices are 115200; 57600; 38400; 19200;
9600; 4800 or 2400.
Parity : This box sets the message parity used by this port. The choices are None;
Always 0; Odd or Even parity.
Standby Mode : The performance of the port when the CPU module is in standby mode is
set by this drop-down box. The Serial Port should appear as Passive if the
Cross Connect DIP switch on the system back plane is set to ‘cross-
connect’.
If the port is set to RS-485 highway and is being used on a multi-drop
highway, it must be set to passive. If it is not shown correctly it probably
means the DIP switch is incorrectly set.
When the port is set to ‘Active’ it will respond to incoming messages with a
reply; when set to ‘Passive’ it will not reply. If the highway is multi-drop,
then these replies will conflict with those from the CPU in Main mode.
Note that a CPU in main mode is active and always replies to incoming
messages.
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.
Host Port 2
Baud Rate : This drop-down box allows the communication speed (baud rate) for the
serial port to be selected. The choices are 115200; 57600; 38400; 19200;
9600; 4800 or 2400.
Parity : This box sets the message parity used by this port. The choices are None;
Always 0; Odd or Even parity.
Standby Mode : The performance of the port when the CPU module is in standby mode is
set by this drop-down box. The Serial Port should appear as Passive if the
Cross Connect DIP switch on the system back plane is set to ‘cross
connect’.
If the port is set to RS-485 highway and is being used on a multi-drop
highway, it must be set to passive. If it is not shown correctly, it probably
means the DIP switch is incorrectly set.
When the port is set to ‘Active’ it will respond to incoming messages with a
reply; when set to ‘Passive’ it will not reply. If the highway is multi-drop,
then these replies will conflict with those from the CPU in Main mode.
Note that a CPU in main mode is active and always replies to incoming
messages.
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