User Manual
Universal Serial/PROFIBUS DP Gateway
GT200-DP-RS
WWW.SSTCOMM.COM
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5.3 Universal Mode
5.3.1 Data Exchange
The GT200-DP-RS supports universal serial protocol that allows PROFIBUS DP master to communicate with
user’s serial devices of customized protocol.
Eo i D1 D2 … Di 0 …
Ei j D1 D2 … Dj 0 …
D1 D2 … Di
D1 D2 … Dj
PROFIBUS DP Master
Serial Devices
GT200-DP-RS
PROFIBUS output data
PROFIBUS input data
Serial receiving data
Serial sending data
“Eo” / “Ei” is the transaction number of the data frame.
“i” / “j” is the data length of the data frame.
“D1”~“Di” / “D1”~”Dj” are data being transmitted.
5.3.2 Data Frame Format
Transaction number
Data length
Data
“00” to fill empty bytes
XX
(1 byte)
N
(1 byte)
1A 2B ...
(N bytes)
00 00 ...
(M bytes, M ≥ 0)
Transaction number:
For output frame, the transaction number should add 1 to trigger the output. For input
frame, when receiving a new frame, the transaction number will automatically add 1.
Data length:
The length of data included in this frame.
Data:
The data being transmitted.
