3.4.10 Serial Communication Interface (Sci) / Rs232 - maxon motor EPOS4 Module 24/1.5 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.
M
ODULE
Module
Header Pin
Table 3-53
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
Continued on next page.
maxon motor control
EPOS4 Positioning Controller
EPOS4 Module/Compact 24/1.5 Hardware Reference
Signal
B38 GND
B39 DSP_RxD
B40 DSP_TxD
SCI – Pin assignment
Serial Communication Interface (SCI)
Document ID: rel6627
Edition: November 2016
© 2016 maxon motor. Subject to change without prior notice.
Description
Ground
Serial communication interface receive (UART)
Serial communication interface transmit (UART)
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)
Setup
Connection Specifications
3-65