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1MRS750881-MUM
Remote Monitoring and Control Unit
Technical Reference Manual
that is compatible with the device. If the device is ordered without sensor inputs, the
sensor connectors X2.1...X2.9 are missing. Short-circuit connectors (1MRS120515)
must be connected to sensor inputs not in use.
The male parts of the multi-pole connector strips are fastened to the printed circuit
boards. The female parts, including accessories, are delivered together with the
device. The female connector part can be secured with fixing accessories and
screws. One max. 1.5 mm
one screw terminal.
The digital inputs and outputs (contacts) of the device are connected to the multi-
pole connectors X3.1... X3.2, X7.1 and X7.3. The auxiliary power supply is
connected to the terminals X7.1:1 (plus polarity) and X7.1:2 (minus polarity). The
REC 523 self-supervision output IRF is linked to the terminals X7.1:3, X7.1:4 and
X7.1:5.
Protective earth is connected to the screw marked with the earth symbol.
The serial interface RS 232 on the rear panel (connector X5.1) is used for connecting
the REC 523 unit to the remote control system via the remote communication
protocol. The connector X5.2, which is a 9-pole D-type subminiature connector, is
used for parametrizing REC 523. When the parametrization cable 1MRS120520 is
connected to the terminal, the SPA protocol is activated with the following
communication parameters:
• Slave number = 1
• Communication speed = 9.6 kbps
• Parity = even
• Data bits = 7
The serial interface RS 485 on the rear panel (connector X5.3) is used for connecting
the REC 523 unit to the SPA bus or the LON bus, the default mode being LON. The
SPA/LON bus is connected via a connection module type RER 103 fitted to the 9-
pole D-type subminiature connector and screwed to the rear panel.
The connectors are designated according to the module slot in REC 523.
Table 7.2.-1
Connector descriptions
Connector Description
X1.1
connector for transformer inputs (current and voltage transformers)
X2.1
connector for sensor channel 10
X2.2
connector for sensor channel 9
X2.3
connector for sensor channel 8
X2.4
connector for sensor channel 7
X2.5
connector for sensor channel 5
X2.6
connector for sensor channel 4
X2.7
connector for sensor channel 3
X2.8
connector for sensor channel 2
X2.9
connector for sensor channel 1
X3.1
upper connector for I/O module BIO1 (slot 3)
X3.2
lower connector for I/O module BIO1 (slot 3)
X5.1
RS 232 for remote communication protocol
2
wire or two max. 0.75 mm
REC 523
2
wires can be connected to
65
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