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1.7.2
1.7.3
196
Serial 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.
Note!
Pay special attention to the instructions concerning the handling, connection, etc. of the optical
fibre cables.
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.
Note!
Pay special attention to the instructions concerning the handling, connection, etc. of the optical
fibre cables.
Technical data
Table 206: Optical fibre connection requirements for SPA/IEC
Cable connector
Fibre diameter
Max. cable length
Table 207: RS485 connection requirements for SPA/IEC
Cable connector
Cable dimension
Max. cable length
Glass fibre
ST connector
62.5/125 μ m
50/125 μ m
1000 m
Phoenix, MSTB 2.5/6-ST-5.08 1757051
SSTP according to EIA Standard RS485
100 m
Chapter 12
Data communication
Plastic fibre
HFBR, Snap-in connector
1 mm
25 m
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