Table 561: IRIG-B
Type Value Accuracy
Input impedance 430 Ohm -
Minimum input voltage
HIGH
4.3 V -
Maximum input voltage
LOW
0.8 V -
Table 562: EIA-485 interface
Type Value Conditions
Minimum differential
driver output voltage
1.5 V –
Maximum output current 60 mA -
Minimum differential
receiver input voltage
0.2 V -
Supported bit rates 300, 600, 1200, 2400,
4800, 9600, 19200,
38400, 57600, 115200
-
Maximum number of 650
IEDs supported on the
same bus
32
-
Max. cable length 925 m (3000 ft) Cable: AWG24 or better, stub lines shall be avoided
Table 563: Serial rear interface
Type
Counter connector
Serial port (X9) Optical serial port, type ST for IEC 60870-5-103 and
DNP serial
Table 564: Optical serial port (X9)
Wave length
Fibre type Connector
Permitted path attenuation
1)
820 nm MM 62,5/125 µm
glass fibre core
ST 6.8 dB (approx. 1700m length with 4 db /
km fibre attenuation)
820 nm MM 50/125 µm
glass fibre core
ST 2.4 dB (approx. 600m length with 4 db / km
fibre attenuation)
1) Maximum allowed attenuation caused by fibre
17.8 Enclosure class
1MRK 511 287-UUS A Section 17
Technical data
649
Technical manual
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