3.4.10 Serial Communication Interface (Sci) / Rs232 - maxon motor EPOS4 Module 50/5 Hardware Reference Manual

3.4.10 Serial Communication Interface (SCI) / RS232

The SCI is a two-wire asynchronous serial port, commonly known as a UART. The SCI modules support
digital communication between the CPU and other asynchronous peripherals that use the standard non-
return-to-zero (NRZ) format.
A common use of the Module's SCI is to build an RS232 interface by wiring it to an RS232 transceiver.
Alternatively, using any of the Compact versions does not require an external transceiver.
Bit rate settings
• Consider the master's maximal bite rate.
• The standard bit rate setting (factory setting) is 115'200 bit/s.
3.4.10.1
Module
Header Pin
6)
Table 3-56
Input voltage
Max. input voltage
High-level input voltage
Low-level input voltage
High-level output voltage
Low-level output voltage
Max. bit rate
Data format
maxon motor control
EPOS4 Positioning Controller
EPOS4 Module/Compact 50/5 Hardware Reference
Module
Signal
B38 GND
B39 DSP_RxD
*6)
B40 DSP_TxD
connect to sensor supply voltage V
SCI – Pin assignment
© 2018 maxon motor. Subject to change without prior notice.
Ground
Serial communication interface receive (UART)
Serial communication interface transmit (UART)
(A40) when RS232 is not in use
Sensor
Serial Communication Interface (SCI)
0...3.3 VDC
5 VDC
>2.0 VDC
<0.8 VDC
>2.4 VDC
<0.4 VDC
115'200 bit/s
NRZ (non-return-to-zero)
Document ID: rel8003
Edition: May 2018
Connection Specifications
Description
Setup
3-63