Installation and Commissioning
Manual SCA-340 / SCA-340-L
sysmik.de
21
Terminal-
point
Name
Function
1.1
COM1 + COM1 RS-485 data positive
1.2
COM1 - COM1 RS-485 data signal - negative
1.3
SH1
COM1 shield
2.1
COM2 + COM2 RS-485 data positive
2.2
COM2 - COM2 RS-485 data signal - negative
2.3
SH2
COM2 shield
1.4
NT1
LON TP/FT-10 (SCA-340-L only), polarity independent
2.4
NT2
Fig. 3.2.3.2:
Terminal assignment of interface connector
For RS-485 the proper polarity has to be observed, and bias and termination
resistors have to be chosen properly. Scalibur has fitting built-in-resistors, which can
be used via DIP switches. The shield connections are internally capacitive
connected to FE (functional earth).
The connection is pluggable and includes two terminal points connected inside the
plug for each bus line. Thus the TP/FT-10 bus can be wired in one line without
additional terminals and the ICS can be removed without bus interruption.
While connecting L
ON
W
ORKS
technology based devices to the bus, the L
ON
M
ARK
wiring guidelines [3] must be observed. According to the network topology one or
two network terminators such as SysMik ACC-BT have to be attached. If shielded
cables are used, the shield can be connected to the SH connector in order to avoid
electrostatic charging. The data bus is polarity independent. More detailed
information can be found in the manual of the used transceiver [2].
3.2.4
Ethernet
The Scalibur provides four Ethernet ports with built-in switch and the following
properties:
shielded RJ45 connectors
10/100BaseT, automatic detection
au
tomatic MDI/MDI-X crossover detection
Figure 3.2.4.1:
Terminal assignment of Ethernet port