User Manual
TMCM-1160 V1.01 Hardware Manual (Rev. 1.01 / 2012-JUL-27) 9
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GUIDELINES FOR POWER SUPPLY:
- keep power supply cables as short as possible
- use large diameters for power supply cables
- add 2200µF or larger filter capacitors near the motor driver unit especially if the distance to the
power supply is large (i.e. more than 2-3m)
3.2.2 Serial Communication Connector
The module supports RS485 and CAN communication via this connector.
CAN interface will be de-activated in case USB is connected due to internal sharing of hardware
resources.
A 2mm pitch 5-pin JST B5B-PH-K connector is used for serial communication.
1
5
Pin
Label
Description
1
CAN_H
CAN bus signal (dominant high)
2
CAN_L
CAN bus signal (dominant low)
3
GND
Module ground (system and signal ground)
4
RS485+
RS485 bus signal (non inverted)
5
RS485-
RS485 bus signal (inverted)
Table 3.3 Connector for serial communication
3.2.2.1 RS485
For remote control and communication with a host system the TMCM-1160 provides a two wire RS485
bus interface. For proper operation the following items should be taken into account when setting up an
RS485 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.
c:>
node
1
node
n
- 1
node
n
Host
Slave Slave Slave
RS485
termination
resistor
(120 Ohm)
termination
resistor
(120 Ohm)
}
keep distance as
short as possible
Figure 6.4 Bus structure
2. BUS TERMINATION:
Especially for longer busses and/or multiple nodes connected to the bus and/or high
communication speeds, the bus should be properly terminated at both ends. The TMCM-1160
does offer on-board termination resistors which can be activated with the help of a jumper. The
jumper has to be removed for units not connected to one end of the bus!
3. NUMBER OF NODES:
The RS485 electrical interface standard (EIA-485) allows up to 32 nodes to be connected to a
single bus. The bus transceiver used on the TMCM-1160 units (SN65HVD485ED) has 1/2 of the
standard bus load and allows a maximum of 64 units to be connected to a single RS485 bus.