Trox Technik EM-BAC-MOD-01 Installation Manual page 12

Installation
5.
Take the expansion module PCB with the
upside up and position it on the TCU3 or
TAM main PCB such that the pin header ③
is exactly above the corresponding plug-in
base ⑤, and the holes for the distance
pieces are above the distance pieces. Then
press the PCB onto the distance pieces.
In case the positions do not exactly line up,
check whether the pin header is still cor-
rectly positioned. Repeat step 2.
If you have pushed the pins too far through
the PCB (step 2), the electrical connection
may not work properly. Repeat step 2.
Fix the PCB using the four fixing screws ⑥.
6.
Tighten the screws only hand-tight.
Connecting data cables
①
Data cable
②
B+ (EIA-485)
③
A- (EIA-485)
④
SH (shield)
7.
EM-BAC-MOD has terminals for two data
cables of an EIA-485 network.
Strip the insulation from the bus cable (at
least two wires), insert the bare wires into
the terminals and tighten the screws by
hand.
12
8.
Expansion module EM-BAC-MOD-01
Make sure that the polarity of the conductor
pairs is correct. Incorrect polarity will result
in inverted data signals and hence commu-
nication errors.
Fix the data cables to the casing using the
wire clamping bracket.
Connect the shield of shielded cables to the
SH terminals. Within a bus segment connect
the shield only at one point to the earth.
Earthing the shield at every controller will
lead to voltage disturbances.
A maximum of 32 units can be operated on
one network segment. To avoid cable reflec-
tions, network segments must be terminated
at both ends with 120Ω bus terminal resis-
tors. PCBs of revision 2 and higher allow
you to fit terminal resistors directly onto the
PCB. (see page 17)
Connect the shield of shielded cables to the
SH terminals. Within a chain (channel) con-
nect the shield only at one point to the earth.
Earthing the shield at every controller will
lead to voltage disturbances.
Recommended data cable
Twisted pair, e.g. JY(St)Y 2 × 2 × 0.8 (use
only twisted pair for B+ and A-)
Close the cover of the TCU3 or TAM casing
(see instructions for the respective device).
Then switch on the power supply to TCU3 or
TAM again.