Siemens S50037 사용자 설명서
SieMo S50037 Data Book
PRELIMINARILY
19/30
UART Interface
Overview
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.
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
Min 9600 baud
Min 9600 baud
115.2 kBaud
Flow Control
RTS/CTS or None
RTS/CTS
Parity
On or Off
Off
Number of Stop
Bits
Bits
1 or 2
1
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.
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.
10
The 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.
function.