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Section 3 Overview of Commands
The AR-3000R and the computer communicate using commands.
3.1 Command Structure
Commands consist of STX (02H) + two uppercase characters.
However, the Type 0 commands listed later are exceptions to this.
3.1.1
Communication Protocol
Depending on the command, four types of communication protocol are used between the computer and
the AR-3000R. As also explained in chapter 4, the ACK referred to in this document is ASCII code 06H
(ACK), and the ER command is a command that transmits/receives an error.
1) When telling the AR-3000R to perform an operation or make a setting.
This is done using the "4.2.1 Control" and "4.2.3 Setting commands" explained in chapter 4.
Commands use the following procedure.
a. The command is sent from the computer to the AR-3000R.
b. If the command is received correctly, the AR-3000R will transmit an ACK command. If not, it will
transmit an ER command.
2) To verify the settings of the AR-3000R
This is done using the "4.2.4 Request command" explained in chapter 4. The command to check the
setting status of the AR-3000R uses the following procedure.
a. The command is sent from the computer to the AR-3000R.
b. If the command was received correctly, the AR-3000R will transmit its settings as the Setting
output command. If the command was received incorrectly, the AR-3000R will transmit an ER
command.
c. If the output from the AR-3000R is received correctly, send an ACK command. This ACK may be
omitted, and is not absolutely necessary. If not correctly, an ER command "stxER:0;" can be sent
to the AR-3000R. The AR-3000R will re-transmit the Setting output command that was output
instep "b". This command may also be omitted, and is not absolutely necessary. You may instead
re-do the sequence from step "a".
3) Commands originating automatically from the AR-3000R
Some commands are transmitted automatically from the AR-3000R. The two commands CC (card
insertion status output) and %% (completion status output when a card operation takes place) fall in
this category, and use the following procedure.
a. The AR-3000R will automatically transmit the command.
There is no need to return an ACK, etc.
a. stx + command
COMPUTER
b. ack or stx ER command
a. stx + command
COMPUTER
b. stx + command or stx ER command
c. ack or stx ER command
a. stx + command
COMPUTER
AR-3000R
AR-3000R
AR-3000R
R Ver.2.01 R
AR-3000
S-232C Reference - 8
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