PCC-IV Instruction Manual (rev. 0.1)
Page 4-16
Section 4
–
Menu Operations
RS485 Port
This is the Isolated RS-485 Modbus communication port which is wired to terminals
1 thru 3 at the back of the PCC-IV CPU card. See Section 2 for wiring. After making
all changes described below, press the
Confirm
soft-button to make the changes.
Press
Back
to cancel all changes. Be s
ure to “Save Config Changes” from the
Memory submenu after making changes.
Device Address
This menu item determines the Modbus node address for this controller. The address
can be any value from 1 to 32. The user must insure that each PCC-IV, or other
Modbus devices on the same cable, have their own unique Address.
Press the
Device Address
soft-button and type in a valid address. Press Enter to save
the value and return to the RS485 Settings screen. Press
Back
to return without
making any changes.
Baud Rate
This menu item determines the Baud rate for Modbus RS-485 communication.
Available baud rates are: 4800 (i.e. 4.8k), 9600, 19200, 38400, 57600, and 115200
Press the
Baud Rate
soft-button and press the correct baud rate on the next screen. Press
Back
to return without
making any changes.
Parity
This menu item determines the parity for Modbus RS-485 communication. A parity of Even, Odd, or None is
available.
Press the
Parity
soft-button and press the correct parity on the next screen. Press
Back
to return without making
any changes.
RTU/ASCII
This menu item selects either Modbus RTU protocol or Modbus ASCII protocol.
Press the
RTU/ASCII
soft-button and press the correct protocol on the next screen. Press
Back
to return without
making any changes.
+/- Data
This menu item directs the PCC-IV Modbus software to reply with either positive integers only, or signed integers
(positive and negative). A few older SCADA and DCS I/O drivers did not support signed integers. PCC-IV Block
Outputs can range from
–32700 to +32700. Set this parameter to SIGNED unless the SCADA or DCS system
specifically has a problem communicating with the PCC-IV.
Press the
+/- Data
soft-button and press the correct format on the next screen. Press
Back
to return without making
any changes.
Ethernet Port 0 (or 1)
These are the Modbus TCP/IP (Ethernet) communication ports which are located on
the CPU board. After making all changes described below, press the
Confirm
soft-
button to make the changes. Press
Back
to cancel all changes.
IPv4 address
This is to IP address used to address this PCC-IV. It must follow the normal TCP/IP
rules such as being a unique address and being on the same subnet as other network
devices. Contact your network administrator if assistance is needed. IP address is
required for Modbus TCP/IP communication.
IPv4 mask
This is the subnet mask of your network. Contact your network administrator if
assistance is needed. IP mask is required for Modbus TCP/IP communication.
