V750-series UHF RFID System User's Manual - PLCeasy

3. Command Line Interface
About this Guide
This chapter lays the groundwork for the communication protocol between client software running on a remote
host and the V750 reader.
3.1 Command Interface
3.1.1 Command / Response Frame Structure
Ethernet and RS-232C has almost the same command structure for command line I/F. Command frame has a
Command Code area to control the R/W and Command Data area that is used with Command Code.
Terminator that indicates the end of the frame is [LF].
RS-232C requires a start code [SOH], check data, and [CR] additionally. The start code shall be at the
beginning of the frame, and the check data and the [CR] shall be just forward terminator [LF].
Command frame for Ethernet
Terminator
Command Code Command Data LF
4 Bytes n 1
Command frame for RS-232C
Terminator
Contents
Description
Ethernet
required
RS-232C
required
Start Code [SOH=0x01] Indicates the beginning of the frame with SOH. No Yes
Command Code Specifies the command the reader executes. Yes Yes
Command Data Specifies the data for use with Command Code Yes Yes
FCS
SOH Command Code Command Data FCS CR LF
1 4 n 2 1 1
FCS Calculation Range
Contents in command frame
Stands for Frame Check Sequence (hereinafter referred
to as “FCS”. The code is to detect an FCS error.)
The result of the horizontal parity calculation from after
SOH through just before the FCS is expressed by two
characters of ASCII code.
Terminator [CR=0x0d] Indicates the end of the frame with CR. No Yes
Terminator [LF=0x0a] Indicates the end of the frame with LF. Yes Yes
No
Yes
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