CSE-H21 User’s Manual Ver. 1.2
Sollae Systems Co., Ltd.
- 38 -
http://www.sollae.co.kr
5.5
U2S
U2S mode allows for UDP communication.
In UDP mode, data are transmitted in blocks, which requires dividing data coming to the serial
port into blocks before transmitting data. A procedure for dividing data into blocks is as follows:
If data of pre-specified bytes [Byte Count] come to the serial port of the ezTCP or if there is no
data during the specified period of time [Timeout], all data received for the same period are
recognized as one block which is then transmitted to the UDP. The [Timeout] unit is 10ms.
Since UDP communication does not require a connection procedure, the user can establish N-
to-M communication via multicast and broadcast.
Serial Device
ezTCP
DATA
“
ABC
”
(UDP)
5ms
<U2S Transmission sequence
–
Byte Count:3, Guard Time: 1>
Remote Host
“
AB
”
“
C
”
“
A
”
“
BC
”
10ms
DATA
“
A
”
(UDP)
“
A
”
9ms
DATA
“
BCA
”
(UDP)
Figure 5-4 U2S Mode
