To obtain a connection structure of communication lines by which the length of the communication lines can be decreased even when a device is added to a refrigeration and cooling system so as to relieve the labor for wiring work and reduce the cost of the communication lines.
A plurality of additional terminal management devices 40 connected in series is newly added between two terminal management devices 5, 5 among a main management device 2 and a plurality of the terminal management devices 5 connected in series. Each of the additional terminal management devices 40 interconnects transmission reception ports 3 and relay pots 4 of them in series with the communication lines 1 and the transmission reception ports 3 and the relay ports 4 of the additional terminal management device 40 placed at a termination of the series connection of the device 40 are connected with each other. The transmission reception ports 3 and the relay ports 4 of the additional terminal management device 40 placed at a top of the series connection are respectively connected to the transmission reception ports 3 of the two terminal management devices 5, 5.
HONMA MUTSUMI
KOJIMA HIDEMIKI
YAMAOKA YASUNARI
RYUSYO INDUSTRIAL CO
| JPH05153005A | 1993-06-18 | |||
| JPH0818597A | 1996-01-19 | |||
| JPH10271138A | 1998-10-09 | |||
| JPH08121927A | 1996-05-17 |
| WO1998018236A1 | 1998-04-30 |
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