Page 12 Micro Rain Radar MRR-2 METEK
2012-02-29 Valid for MRR Service Version 6.0.0.3 / Firmware 6.00
4.2.4 Junction Box / Power Supply
Figure 4: Junction Box
The junction box is used to pass through the communication between the PC
and the RCPD. For this purpose it has a 9-pin D-sub-miniature socket for the
serial cable (see Figure 5) to the MRR-PC and a flanged socket for the control
cable (see Figure 5) to the RCPD.
The power supply for the RCPD and Transceiver is also integrated in the
junction box. An IEC connector for the mains supply of 230 VAC is on the front
side of the case. The power supply (24 VDC) for the RCPD and Transceiver is
also passed through the control cable (see Figure 5).
All MRR systems produced in 2011 ff. are equipped with an RS422 Interface:
The communication between RCPD and Junction Box is on RS422 level. In
the Junction Box the signals are converted to RS232 level.
The communication between junction box and PC is on RS232 level.
MRR systems prior to 2011 use only RS232 level for communication, there is
no RS422/RS232 converter in the junction box.
Note: The junction box is not appropriate for outdoor operation.
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