DA-683 Series
Introduction
If you are a programmer and you need to write a driver for your serial device, then you may need to use
formula A. If you have a serial device that requires using a non-standard baudrate, then you can use formula
B to determine if the DA-683 supports a baudrate within the tolerance specified by the serial device
manufacturer.
Example: Your serial device requires using a baudrate of 5340 bps and has a tolerance of 2 bps. Can the
DA-683 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-683 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
115200 8
0
1800
512
0
57600 16
0
1200 768
0
38400 24
0
600
1536 0
19200 48
0
300
3072 0
9600 96
0
150 6144 0
7200 128 0
75
12288
0
4800 192 0
50
18432
0
2400
384
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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