LS Industrial Systems LGRF-H, User Manual

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“LS Ubiquitous RF-ID System”
4.2.8 ASCII Communication Frame Structure
This chapter describes the Sending/Receiving Frame structure which is consisted of ASCII
communication mode.
The basic communication mode of LGRF-H Reader is HEX mode and additionally, provides
ASCII communication mode. This means that the Sending/Receiving Frame is consisted of
basic HEX communication mode structure with the item added for ASCII communication.
(Note. In order to communicate by ASCII communication mode, Reaser should be preset as ASCII
communication mode.)
ASCII mode communication shall be set by changing the value of Frame marked as HEX
value in basic Sending/Receiving Frame of HEX mode communication with ASCII value and the
Sending/Receiving Frame shall be composed by adding 05 (ENQ) indicating the header of
ASCII Frame and 0D(CR) and 0A(LF) indicating the tail of ASCII Frame.
[Table 4.2.8.1] below shows the Sending Frame structure among ASCII communication
modes. And [Table 4.2.8.2] shows the description of each item consisting of the Sending Frame.
(Reference. [Table 4.2.8.1] and [Table 4.2.8.4] describe the examle of Sending/Receiving
Frame of Read Multi Block.)
[Table 4.2.8.1] ASCII Sending Frame Structure
[Table 4.2.8.2] Description of each item of Sending Frame
No. Items Description
1 ENQ Header of ASCII Frame (marked by 05)
2 Start Byte Byte indicating the start of Sending Frame (marked by 46 30)
3 Station ID Station no. given to Reader (adjusting the value of rotary
switch next to Reader)
4 Data Length Total length of Frame (from Start Byte to Check Sum)
5 Control Mode Mode to select the control environment of Reader
No. 1 2 3 4 5 6 7(LSB) 8 9 10
Des-
crip-
tion
ENQ
(05)
Start Byte Station
ID
(SID)
Length
(DL)
Control
Mode
CMD Determined
by Command
1,2
Check sum
(CS)
CR
(0D)
LF
(0A)
(46) (30)