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Serial communication Chapter 9
Data communication
The fibre optic SPA/IEC port can be connected point-to-point, in a loop, or with a star coupler.
The incoming optical fibre is connected to the Rx receiver input and the outgoing optical fibre
to the Tx transmitter output. The module is identified with a number on the label on the module.
The electrical RS485 can be connected in multidrop with maximum 4 terminals.
2.7.2 Design, LON
The serial communication module for LON is placed in a slot at the rear of the Main processing
module. One of the following options is available for serial communication:
• two plastic fibre cables; (Rx, Tx) or
• two glass fibre cables; (Rx, Tx)
The type of connection is chosen when ordering the terminal.
The incoming optical fibre is connected to the Rx receiver input and the outgoing optical fibre
to the Tx transmitter output. The module is identified with a number on the label on the module.
2.7.3 Technical data
Table 156: Optical fibre connection requirements for SPA/IEC
Table 157: RS485 connection requirements for SPA/IEC
Note!
Pay special attention to the instructions concerning the handling, connection, etc. of the optical
fibre cables.
Note!
Pay special attention to the instructions concerning the handling, connection, etc. of the optical
fibre cables.
Glass fibre Plastic fibre
Cable connector ST connector HFBR, Snap-in connector
Fibre diameter 62.5/125 μm
50/125 μm
1 mm
Max. cable length 1000 m 25 m
Cable connector Phoenix, MSTB 2.5/6-ST-5.08 1757051
Cable dimension SSTP according to EIA Standard RS485
Max. cable length 100 m
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