Serial Port; Direct Inputs And Outputs - GE D90 Plus Instruction Manual

SERIAL PORT

Serial port

Direct inputs and outputs

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Plus
The D90 is equipped with one serial RS485 communication port, located on the main
processor module in slot D at the back of the unit. The RS485 port has settings for baud
rate and parity. It is important that these parameters agree with the settings used on the
computer or other equipment that is connected to these ports. This port can be connected
to a computer running the EnerVista UR
and upload setting files, view measured parameters, and upgrade the device firmware. A
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maximum of 32 D90 devices can be daisy-chained and connected to a DCS, PLC, or
computer using the RS485 port.
Select the Settings > Communications > Serial Ports menu to open the serial port
configuration window.
Figure 122: Serial port configuration settings
The following settings are available to configure the RS485 port.
Baud Rate
Range: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200
Default: 19200
This setting specifies the baud rate (bits per second) for the RS485 port.
Parity
Range: None, Odd, Even
Default: None
This setting specifies the parity for the RS485 port.
Minimum Response Time
Range: 0 to 1000 ms in steps of 10
Default: 0 ms
The minimum time before the port transmits after receiving data from a host can be set.
This allows operation with hosts that hold the RS485 transmitter active for some time
after each transmission.
Connection
Range: Local, Remote
Default: Local
This setting selects whether the serial RS485 connection is classified as local access or
remote access for security purposes.
Direct inputs and outputs are available when an inter-relay communications card is
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installed in the D90 . They provide a means of sharing digital point states among a
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number of UR or UR -series IEDs over a dedicated fiber, RS422, or G.703 interface. No
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Setup software. This software can download
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D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: COMMUNICATIONS