SIGMATEK S-IPC, Руководство пользователя, Страница: 34 / 42

S-IPC INTEL
®
ATOM DUAL CORE
4. DIAS Bus Termination
In a DIAS bus system, both end modules must be terminated. This is required to avoid data
transfer errors that are caused by reflections in the data lines.
If the S-IPC is one to the end modules, the termination can be made with a 100-Ohm resis-
tor between MBUS+ and MBUS as well as SBUS+ und SBUS-. If this is the case, the 2
nd
DIAS bus connector is for the remains available.
2 x 100-Ohm resistor
5. DIAS bus connection to C-DIAS modules
To ensure a good bus connection, several wiring guidelines must be followed:
•
The cable used must be designed for the data transfer speed:
Data cable (10 MBits, 2 x 2 wire TWISTED PAIR, shielded)
E.g.: LAPPKABEL / UNITRONIC-BUSLEITUNG FD P LD
•
Because of the internal resistance of the module, the cable impedance should be 100
Ohms.
•
With twisted-pair cables, ensure that the correct pairs are connected to one another:
2x2 pair cables: Pair 1 MBUS+
MBUS-
Pair 2 SBUS+
SBUS-
•
The shielding must be connected over a large area and the shortest possible route.
•
To connect the individual wires to the connector, the insulation must be removed and
the exposed shielding shifted to the side. Only remove as much of the insulation and
shielding as needed.
Page 34 21.02.2014