Siemens S50037 Uart Interface, Uart Settings, Property Possible Values Default Setting, Rts/Cts

SieMo S50037 Data Book PRELIMINARILY

UART Interface

Overview

￿Universal Asynchronous Receiver Transmitter

￿Standard 16550 compatible UART interface

￿Min 9600Baud, Max 1.5MBaud

￿UART_TX and UART_RX used to transmit data

￿UART_CTS and UART_RTS used to implement RS232 hardware flow control

The UART (Universal Asynchronous Receiver Transmitter) provides a simple mechanism to communicate with other devices. The UART uses 4 (or 2 if HW – Handshake is not in use)) lines for serial data transmission.

figure 16 UART Directions

UART Settings

Property	Possible Values	Default Setting
Baud Rate	Max 1.536 MBaud	115.2 kBaud
	Min 9600 baud
Flow Control	RTS/CTS or None10	RTS/CTS
Parity	On or Off	Off
Number of Stop	1 or 2	1
Bits

Note: To communicate with a standard PC a level-converter is required. SieMo uses 0V and 3V levels. Standard PC usually provide baudrates up to 115.2 kBit/s, if SieMo shall communicate with a PC at higher data rates an accelerated serial port adapter and a appropriate level converter is required. It is strongly recommended to use a level converter with ESD protection. See Application below.

10The CTS input must be de-assigned by the host for the duration of at least 4 bits (e.g. 35 ms with a baudrate of 115.2 kBaud). Any shorter period of de-assigning the handshake input can cause incorrect function.

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