2.3
Date Code 20080918 Instruction Manual SEL-749M Relay
Installation
I/O Configuration
Choose the combination of cards most suited for your application from the
following selection.
Power Supply and I/O (2 inputs, 3 outputs) Card. Supported in Slot A.
See the model option table at www.selinc.com for power supply and input
voltage options.
Processor/Communications Card. Supported in Slot B. Select IRIG-B
input or PTC input option.
Select the communications ports necessary for your application from the
base-unit options shown in Table 2.2.
Port F supports the following protocols:
➤ SELBOOT
➤ SEL ASCII and Compressed ASCII
➤ SEL Fast Meter
➤ SEL Settings File Transfer
Port 2 (RX only)
➤ supports SEL-2600 RTD modules
Port 3 supports 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
E N/A Voltage card
Z N/A CT card in base unit
Table 2.1 Slot Allocations for Different Cards (Sheet 2 of 2)
Rear-Panel
Slot
Software
Reference
Description
NOTE: When either a current or
voltage signal is available, the
SEL-749M tracks the frequency
(maximum slew rate of 9 Hz), and
samples 16 times a cycle at the
measured frequency. If neither signal
is available, the relay samples at a
fixed rate of 16 times nominal
frequency.
Table 2.2 Communications Ports
Port Location Feature Description
F Front Panel Standard Nonisolated EIA-232 serial port
2 Rear Panel Standard Isolated multimode fiber-optic port with
ST connector (receive only)
3 Rear Panel Standard Nonisolated EIA-232 serial port
Courtesy of NationalSwitchgear.com
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