Parameter
Supported Values
Baud Rate
300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200
Default: 9600
Duplex
Half
Default: Half
Parity
Odd, None or Even
Default: None
Data Bits
7 or 8 Bits
Default: 8 Bits
Stop Bits
1 Bit
Default: 1 Bit
Receive Flow Control
None or Xon/Xoff
Default: None
Transmit Flow Control
None or Xon/Xoff
Default: None
Station
1 to 65534
Default: 1
Protocol
None, Modbus RTU or Modbus ASCII, DF1 or DNP.
Default: Modbus RTU
Addressing Mode
Standard or Extended
Default: Standard
COM1 transmits and receives differential voltages to other RS-485 devices on a network. The RS-
485 specification allows a maximum of 32 devices connected on a single RS-485 network. The
specification for RS-485 recommends that the cable length should not exceed a maximum of 4000
feet or 1200 meters.
The signal grounds of the RS-485 devices in the network are not connected together but instead are
referenced to their respective incoming electrical grounds. The grounds of the RS-485 devices on the
network must be within several volts of each other. The SCADAPack 350 ground is connected to the
chassis.
10.2.2
COM2 RS-485 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-485 operation J13 must have the jumper link installed in position “RS-485”. This section
covers RS-485 operation. For RS-232 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
Half
Default: Half
Parity
Odd, None or Even
Default: None
SCADAPack 350 Hardware Manual
February 14, 2007
38
