Technical data

Technical Datasheet
&
User’s Manual
Narrowband multi-channel data radio modem
LinkWiser™-S400M Rev. 2.1
Cellution Inc.
#317, NKIC, 48-84 Honguen-1dong, Seodaemun-gu, Seoul, Korea Zip: 120-760
Enquiries: [e-mail]
/ [e-mail]
Voice: [phone] / Fax: [phone]
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Figure1 Typical System Block Diagram
Data is sent and received in standard ‘RS232’ serial format and there is no restriction on characters
that may be sent.
If you configure “Serial Link Time Out” value more than one byte interval, the data flow look like
Figure2, but if you configure “Serial Link Time Out” value less than one byte interval, the data flow
looks like Figure3.
We recommend Figure2 configuration rather than Figure3 for more robust RF transmission.
Configuring “Serial Link Time Out” like Figure3 enables to split the packet into several frames and
re-packetize that frame with adding pre-defined preambles, headers and post-ambles automatically.
Thus, this case makes more overhead on RF section rather than original USER DATA eventually.
A: TX UART Timing | B: AIR RATE Timing | C: RX UART Timing
Figure2: Serial Link Time Out is more than 1byte time Interval
Figure3: Serial Link Time Out is less than 1byte time Interval