Moxa DA-681-I-DP-LX Руководство по программной части (Windows CE) онлайн [31/47] 170770

DA-681-CE Series WinCE User’s Manual Management Tools

Example: Your serial device requires using a baudrate of 5340 bps and has a tolerance of 2 bps.

Can the DA-681 be used with this device?

Solution

: Set formula B to the desired baudrate and then solve for K.

8 x 912600/K = 5338 ==> K = 1367.703259…

This shows that the supported baudrate closest to 5340 comes from setting K=1367 or K=1368.

K=1368 ==> Baudrate1 = 5336.842105...

K=1367 ==> Baudrate2 = 5340.746159…

Since 5338 – Baudrate1 < 2, we can see that the DA-681 supports the serial device.

Note that we can use formula A to generate the so-called “standard” baudrates, which come from

setting M=0, and setting N equal to certain integers.

Standard Baudrates

Baudrate N M Baudrate N M

921600 1 0 4800 192 0

460800 2 0 2400 384 0

230400 4 0 1800 512 0

115200 8 0 1200 768 0

57600 16 0 600 1536 0

38400 24 0 300 3072 0

19200 48 0 150 6144 0

9600 96 0 75 12288 0

7200 128 0 50 18432 0

WARNING

Communication between a serial device and a Moxa UART port may not work correctly if the

serial device uses a baudrate that it not within the correct tolerance of a baudrate calculated from

either formula A or formula B.

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