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Publication S130E
Issue 1.0
Pakscan IIS Technical Manual
9.2 Communication Ports
The master station is able to be configured for different functions on each of its two communication ports.
However the Modbus address of the master station relates to both ports, they cannot differ, in addition the
master station has a sequence address as well as a host comms address and these two must never be the same.
The settings to make are in the Master Station Setup Menu as
described in section 8.5. To reach the required screens from the
opening top menu screen, press '1' to select the master station side
of the menu structure. The next screen revealed shows the options
for what to do next. Press '5' to select Setup. This command is
only allowed if the PIN number is known or the Access level set to
1. The next screen displayed is as shown in 8.5.1 and this has
under option 4 the ability to set the master station Modbus address
and sequence address.
Press '4', then ‘1’ and enter the number to be used as the Modbus
address, when it is correct press ‘LOAD’. Repeat the exercise for
the sequence address. The screen refreshes to show the selected
address and a message briefly appears informing you that the new
setup is loaded. Return to the previous menu by pressing ‘MENU’.
From the screen setup menu screen press '1' to select Port 1. The revealed screen shows the selectable options
for Port 1.
Pressing '2' will scroll round the available protocols, select the required. Note that Pakvision uses the Generic
Modbus setting.
Pressing '3' steps round the baud rates (Pakvision uses 9600).
Pressing '4' selects the parity (Pakvision uses Odd).
When the settings are correct, press 'MENU' to return to the previous page. The chosen settings will only
become active once you leave the 'set up' screen. Press '2' to select Port 2.
The screen is very similar to the one for Port 1, and the commands are the same. Make the settings required in
the same way as for Port 1.
Having set the port communications parameters it is then necessary to set the alarm linkage only if both ports
are to be used. Press ‘6’ to gain access to the screen shown in section 8.5.2.1. Linked alarms will operate such
that accepting an alarm using comm port 1 will also cause it to be accepted in the data base serving comm port
2 (and vice versa). If the host system is using redundant communications with two links then the option is best
set to ‘Linked’. If two independent hosts are accessing the master station then the setting should be ‘Separate’.
Once the settings are correct, press 'MENU' to install the settings and return to the previous page.
Addresses
Host and sequences
Comms Proto-
col
Generic Modbus
Yokogawa Modbus
H’well PLCG Modbus
H’well SI Modbus
Baud Rate
2400, 4800, 9600,
19200, 38400, 96000
Parity
Odd, Even, None, al-
ways 0
Port Alarms
Linked, Separate
Setup:
