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3.5.10 Serial RS-232 connection
3.5.10.1
Serial RS-232 connection
3.5.10.2
Recommendation for wiring
a)
If you build the serial cable, you can use a 3-wire shielded cable with shield connected to BOTH ends. Do not
use the shield as GND. The ground wire must be included inside the shield, like the 232Rx and 232Tx signals
b)
Always power-off all the iMOTIONCUBE supplies before inserting/removing the RS-232 serial connector
c)
Do not rely on an earthed PC to provide the iMOTIONCUBE GND connection! The drive must be earthed
through a separate circuit. Most communication problems are caused by the lack of such connection
3.5.11 CAN-bus connection (for CAN drives only)
3.5.11.1
CAN connection
Remarks:
1.
The
CAN
network
Figure 3.33 shows how to connect it on your network
2.
CAN signals are not insulated from other iMOTIONCUBE circuits.
3.5.11.2
Recommendation for wiring
a)
Build CAN network using cables with twisted wires (2 wires/pair), with CAN-Hi twisted together with CAN-Lo.
It is recommended but not mandatory to use a shielded cable. If so, connect the shield to GND. The cable
impedance must be 105 ... 135 ohms (120 ohms typical) and a capacitance below 30pF/meter.
b)
When using a printed circuit board (PCB) motherboard based on FR-4 material, build the CAN network using
a pair of 12mil (0.012") tracks, spaced 8 to 10mils (0.008"...0.010") apart, placed over a local ground plane
(microstrip) which extends at least 1mm left and right to the tracks.
c)
Whenever possible, use daisy-chain links between the CAN nodes. Avoid using stubs. A stub is a "T"
connection, where a derivation is taken from the main bus. When stubs can't be avoided keep them as short
as possible. For 1 Mbit/s (worst case), the maximum stub length must be below 0.3 meters.
d)
The 120Ω termination resistors must be rated at 0.2W minimum. Do not use winded resistors, which are
inductive.
Technosoft 2019
Figure 3.31. Serial RS-232 connection
Figure 3.32. CAN connection
requires
a
120-Ohm
36
terminator.
This
is
not
included
on
the
iMOTIONCUBE Technical Reference
board.
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