USRIOT USR-N520, User Manual

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Synchronous baud rate is named RFC2217. USR Similar RFC2217 make adjustments on the basis of
RFC2217 protocol to improve accuracy of transmission.
Protocol length is 8 bytes. And values taken for example is in HEX:
Name
Packet
Header
Baud Rate Bytes parameter Parity
Bytes 3 3 1 1
Explanation
reduce
misjudgment
High is in front,
smallest is
600(00 02 58)
data bytes, baud
rate, parity
Remove 4 bits
of header and
ignore the high
bit
(115200,
N,8,1)
55 AA 55 01 C2 00 03 46
(9600,
N,8,1)
55 AA 55 00 25 80 03 28
Serial parameter bit:
Bit # Explanation Value Description
1:0 Data bit selection
00 5 bits
01 6 bits
10 7 bits
11 8bits
2 Stop Bit
00 1 bit
01 2bits
3 Parity Enable
00 Disable Parity
01 Enable Parity
5:4 Parity Type
00 ODD
01 EVEN
10 Mark
11 Clear
8:6 NC 000 0
Using methods:
1. USR-TCP232-M4,E45 Setup software, click “Synchronous baud rate (RFC2217)”.
2. When serial parameter changes is needed, it send RFC 2217 packet. USR-N520 receive the
command from network and revise serial parameter accordingly.