4 Setting Up
4.7 Connecting the optic bus cables
30
Version 04 05/2014
䊳
Connect the individual repeaters using a duplex F/O
cable with BFOC/2.5 (ST
®
) connectors.
D
Note the maximum length of the F/O cables and the
possible fiber types specified in the technical data.
䊳
Ensure that one optical input
a
and one optical
output
J
are connected to one another (crossover
connect ion).
The sticker on the side indicates the related BFOC
sockets of the two channels.
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Ensure that the strain relief of the F/O cables is suffi-
cient and observe their minimum bend rad iuses.
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Seal unused BFOC sockets with the protection caps
supplied. Ambient light can interfere with the network,
especially if the environment is very bright.
Dust which gets in can render the optical components
unusable.
Channel 3
Channel 2
J a
J a
Fig. 10: Location of optical channels 2 and 3, with their
respective inputs and outputs
4.7 Connecting the optic bus cables
4.8 Connecting the electric bus cables
Fig. 11: Electrical channel – assignment of Sub-D socket
9 / n.c.
8 / RxD/TxD –N
7 / n.c.
6 / + 5 V Output
Ground
n.c.
RxD/TxD –P
Ground
Shield
/ 5
/ 4
/ 3
/ 2
/ 1
The repeaters are fitted with an RS 485 electrical channel.
This is a 9-pin Sub-D socket with a screw lock (inside
thread UNC 4-40).
The pin assignment complies with the PROFIBUS stan-
dard. At Pin 6 there is a short circuit-proof 5 V output for
supplying external pull-up/pull-down resistors.
As opposed to the 24V power supply, the RS 485 bus
lines RxD/TxD–N and RxD/TxD–P are indirect-coupled
(functional separation) within SELV restrictions.
The RS 485 interface is electrically connected to the
front panel/function ground.