User Manual

PD42-x-1241 Hardware Manual • Hardware Version V1.00 | Document Revision V1.23 • 2019-JAN-02

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Pin Label Direction Description

3 A1 out Pin 1 of motor coil A

4 A2 out Pin 2 of motor coil A

Table 6: Motor Connector Pin Assignment

NOTICE

Do not connect or disconnect motor during operation!

Motor cable and mo-

tor inductivity might lead to voltage spikes when the motor is (dis)connected

while energized. These voltage spikes might exceed voltage limits of the driver

MOSFETs and might permanently damage them. Therefore, always switch oﬀ

/ disconnect power supply or at least disable driver stage before connecting /

disconnecting motor.

NOTICE

Do not mix-up power supply and motor connectors!

4.3 RS485 + CAN Connector

For serial communication the PD42-x-1241 oﬀers selection between RS485, CAN and USB interfaces. While

the USB interface is available for conﬁguration and service of the board, mainly (e.g. parameter settings,

ﬁrmware updates) a 5-pin JST PH series connector oﬀers 2-wire RS485 and CAN interfaces for in system

communication.

NOTICE

Due to hardware ressource sharing USB and CAN communication interfaces are

not available at the same time. As soon as USB is physically attached to a host or

hub the CAN interface will be switched oﬀ.

RS485 + CAN Connector Pin Assignment

Pin Label Direction Description

1 GND Power (GND) Common system supply and signal ground

2 RS485+ Bidirectional RS485 interface, diﬀ. signal (non-inverting)

3 RS485- Bidirectional RS485 interface, diﬀ. signal (inverting)

4 CAN_H Bidirectional CAN interface, diﬀ. signal (non-inverting)

5 CAN_L Bidirectional CAN interface, diﬀ. signal (inverting)

Table 7: RS485 + CAN Connector Pin Assignment

4.4 USB Connector

For serial communication the PD42-x-1241 oﬀers selection between RS485, CAN and USB interfaces. The

USB interface via on-board micro-USB connector (type B) is available for conﬁguration and service of the

board, mainly (e.g. parameter settings, ﬁrmware updates). The USB device interface supports full speed

(12Mbit/s) communication and supports bus powered and self-powered operation. During bus-powered

operation the low voltage logic part of the board will be powered, only. This includes the microcontroller

and the non-volatile memory and therefore allows parameter settings and ﬁrmware updates of the board

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