10 Serial
Communication
The SCADAPack 350 controller is equipped with three serial communication ports which support
RS-232 and RS-485 communication. COM1 is a dedicated RS-485 port. The serial ports are labeled
COM1, COM2 and COM3. Refer to
the serial ports.
COM2 can be configured for RS-232 or RS-485 while COM3 is a dedicated RS-232 port. Details of
the operation and properties of each serial port is described below.
10.1
RS-232 Serial Communications Ports
COM2 and COM3 support RS-232 communication. All RS-232 wiring must use shielded cable.
The shield should be connected to chassis ground at one point. Failure to properly shield the cable
may result in the installation not complying with FCC or DOC radio interference regulations.
10.1.1
COM2 RS-232 Serial Port
Serial port COM2 can be configured as either a six-line RS-232 port or as a two-wire RS-485 port.
For RS-232 operation J13 on the controller board must have the jumper link installed in position
“RS-232”. This section covers RS-232 operation. For RS-485 operation refer to section
The following table shows the serial and protocol communication parameters supported by COM2.
These parameters are set from TelePACE, ISaGRAF Workbench or from an application program
running in the SCADAPack 350 controller. Default values are set when a Cold Boot or Service Boot
is performed on the SCADAPack 350 controller.
Parameter
Supported Values
Baud Rate
300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200
Default: 9600
Duplex
Full or Half
Default: Full
Parity
Odd, None or Even
Default: None
Data Bits
7 or 8 Bits
Default: 8 Bits
Stop Bits
1 or 2 Bits
Default: 1 Bit
Receive Flow Control
ModbusRTU or None
Default: ModbusRTU
Transmit Flow Control
Ignore CTS or None
Default: None
Station
1 to 65534
Default: 1
Protocol
None, Modbus RTU, Modbus ASCII, DF1 and DNP
Default: Modbus RTU
Addressing Mode
Standard or Extended
Default: Standard
SCADAPack 350 Hardware Manual
February 14, 2007
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