REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04 REF542plus: Installation and Commissioning 60 / 80
9.3 Interface
9.3.1 HMI Control Unit:
Optical/electrical standard interface RS 232 to the Notebook PC (at the front)
Electrical isolated standard interface RS 485 to the Central Unit (at the rear)
9.3.2 Central Unit:
Electrical isolated standard interface RS 485 to the HMI
Electrical standard interface RS 232 for updating the firmware
9.4 Analog output board (optional)
Four channel 0 to 20 mA respectively 4 to 20 mA
9.5 Communication (optional)
SPABUS, electrical interface with standard RS232 or optical interface with snap-in
type connector for plastic fiber respectively standard FMA connector for glass fiber
(multi mode)
LON (according to LAG1.4), optical interface with standard ST connector for glass fi-
ber (multi mode)
IEC 60870-5-103 with extension according to VDEW guidelines for controlling, optical
interface with standard ST connector for glass fiber (multi mode)
MODBUS RTU, electrical interface with two standard RS485 or optical interface with
two standard ST connector for glass fiber (multi mode)
9.6 Power supply
9.6.1 Central Unit
Rated voltage 110 VDC (-15%, +10%),
220 VDC (-15%, +10%) or
48 to 220 VDC (-15%, +10%)
Power consumption
≤ 18 W (base version with 1 BIO)
Inrush current
≤ 10 A peak value
9.6.2 RHMI Control Unit
Rated voltage: For auxiliary voltage in the range of:
48 … 110 VDC (-15%, +10%) or
110 … 220 VDC (-15%, +10%)
Power consumption
≤ 6 W
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