2.5
Date Code 20081022 Instruction Manual SEL-787 Relay
Installation
I/O Configuration
Communications Card
Either the DeviceNet (see Appendix G: DeviceNet Communications) or the
EIA-232/ EIA-485 communications card is supported in Slot C. The EIA-232/
EIA-485 card provides one serial port with one of the following two serial
port interfaces:
➤ Port 4A, an isolated EIA-485 serial port interface
➤ Port 4C, nonisolated EIA-232 serial port interface, supporting
the +5 Vdc interface
Select either EIA-232 or EIA-485 functionality using the Port 4 Setting
COMM Interface. Table 2.2 shows the port number, interface, and type of
connector for the two protocols.
The communications card supports all of the following protocols:
➤ Modbus RTU Slave
➤ SEL ASCII and Compressed ASCII
➤ SEL Fast Meter
➤ SEL Fast Operate
➤ SEL Fast SER
➤ SEL Fast Message Unsolicited Write
➤ SEL Settings File Transfer
➤ SEL MIRRORED BITS (MBA, MBB, MB8A, MB8B, MBTB,
MBTA)
➤ Event Messenger
➤ DNP3 Slave Level 2
➤ C37.118 (Synchrophasor Data)
Current Card (6 ACI)
Supported in Slot Z only, this card provides Winding 1 and Winding 2 current
inputs for three-phase CTs. You can order the following secondary current
ratings:
➤ 1 A Winding 1, 1 A Winding 2
➤ 1 A Winding 1, 5 A Winding 2
➤ 5 A Winding 1, 5 A Winding 2
Table 2.2 Communication Card Interfaces and Connectors
Port Interface Connectors
4A EIA-485 5-pin Euro
4C EIA-232 D-sub
Table 2.3 Current Card Terminal Allocation
Ter min a l N u m b er Designator Description
01, 02 IAW1 Phase A Winding 1 current input
03, 04 IBW1 Phase B Winding 1 current input
05, 06 ICW1 Phase C Winding 1 current input
07, 08 IAW2 Phase A Winding 2 current input
09, 10 IBW2 Phase B Winding 2 current input
11, 12 ICW2 Phase C Winding 2 current input
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