r
a.The command is sent from the computer to the AR-3000.
b.If the command was received correctly, the AR-3000 will transmit its settings as the Setting output command. If the command was received incorrectly, the AR-3000 will transmit an ER command.
c.If the output from the AR-3000 is received correctly, send an ACK command. This ACK may be omitted, and is not absolutely necessary. If not correctly, an ER command “ER:0;” can be sent to the AR-3000. The AR-3000 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-3000
Some commands are transmitted automatically from the AR-3000. 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. stx + command
COMPUTER 
AR-3000
a.The AR-3000 will automatically transmit the command. There is no need to return an ACK, etc.
4)Commands accompanied by confirmation
The 4.2.2 Edit command explained in chapter 4 is of this type. To prevent accidental erasure of data, edit commands are executed after entering Delete mode. Commands use the following procedure.
a. stx + DM command
COMPUTER 
AR-3000
b. ack or stx ER command
c. stx + Edit command
d. stx + Edit command ( same as step “c” ) e. ack or stx ER command
a.Transmit the DM command. The AR-3000 will enter Delete mode.
b.If the DM command is received correctly, an ACK will be returned. If there is a command error, the ER command will be returned and the AR-3000 will automatically exit Delete mode.
c.If no error has occurred, transmit the command you wish to execute.
d.To confirm, the AR-3000 will send back the command that it received in step “c”.
e.If the command is correct, send an ACK. This will cause the command to be executed. Then, after receiving the command, the AR-3000 will automatically exit Delete mode. If the command is an error, you can send an ER command “ER:1;”. The command will be canceled, and the AR-3000 will exit Delete mode.
