TMCM-1140 Datasheet, PDF (10/26 Pages) TRINAMIC Motion Control GmbH & Co. KG. – MODULE FOR STEPPER MOTORS

TMCM-1140 V1.3 Hardware Manual (Rev. 1.04 / 2015-JAN-05)
10
Slave
node
n- 1
Slave
node
n
+5V
pull-up (680R)
termination
resistor
(220R)
RS485+ / RS485A
RS485- / RS485B
termination
resistor
(120R)
pull-down (680R)
GND
Figure 3.4: Bus lines with resistor (Bias) network on one side, only
Or add resistor (Bias) network at both ends of the bus (like Profibus™ termination):
+5V
pull-up (390R)
Slave
node
n- 1
Slave
node
n
+5V
pull-up (390R)
termination
resistor
(220R)
RS485+ / RS485A
RS485- / RS485B
termination
resistor
(220R)
pull-down (390R)
pull-down (390R)
GND
GND
Figure 3.5: Bus lines with resistor (Bias) network at both ends
Certain RS485 interface converters available for PCs already include these additional resistors (e.g.
USB-2-485 with bias network at one end of the bus).
3.3.1.3 CAN
For remote control and communication with a host system the TMCM-1140 provides a CAN bus interface.
Please note that the CAN interface is not available in case USB is connected. For proper operation the
following items should be taken into account when setting up a CAN network:
1. BUS STRUCTURE:
The network topology should follow a bus structure as closely as possible. That is, the
connection between each node and the bus itself should be as short as possible. Basically, it
should be short compared to the length of the bus.
termination
resistor
(120 Ohm)
Host
c:>
Slave
node
1
}
CAN
Figure 3.6 CAN bus structure
Slave
node
n-1
Slave
node
n
keep distance as
short as possible
termination
resistor
(120 Ohm)
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