Electrical aspects common for both solutions
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4.4
Diagnostic interfaces
The diagnostic interface can be used for
·
configuration download,
·
diagnostic purposes and
·
firmware update
It is
mandatory
to add a diagnostic interface to the host system.
4.4.1
Serial interface – UART
4.4.1.1
Interface description
The following pins of the netRAPID relate to the serial interface (UART).
The table provides the signal names:
Pin
Name
Shared with
44
UART_RX
-
45
UART_TX
-
Table 9: Pin assignment to serial interface (UART)
The signals UART_RX and UART_TX have LVTTL level. They allow setting
up an interface for diagnostic purposes.
4.4.1.2
Design recommendation
The following figure shows in general how to implement a UART interface
using the MAX3232 circuit. It contains an excerpt of the schematics of the
evaluation board NRPEB H90-RE and shows a more detailed example of a
suitable UART interface for netRAPID 90:
Figure 11: UART DSub
netRAPID 90 | Design guide
DOC190601DG01EN | Revision 1 (Draft 10) | English | 2019-09 | Preliminary | Public
© Hilscher 2019
