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15. RS-232C CONTROL METHOD
Signals are connected to the RS-232C connector in a straight
format as shown in Table 5-9 RS-232C connection signals.
This is because a crossing connection is provided inside
the unit. Communication conditions are set to meet the con-
ditions given in Table 5-10.
Item
Communication system
Communication type
16. RS-232C COMMAND LIST
Table 5-11 shows the RS-232C command list.
As a return value for a specified command received, an
acknowledgment signal (ACK = 06h) is output when the
command is correctly received within the operating condi-
tions, or a non-acknowledgment signal (NAK = 16h) is out-
put without the operating condition. Nothing is output if
reception terminates abnormally.
When sending a command, leave the interval for at least
100 ms. Moreover, a longer process time is necessary at
the power on or off, and input switching, so take care to
leave a sufficient interval.
Table 5-10 RS-232C communication conditions
Transmission speed 9600 baud, No parity, data length 8 bit, Stop bit: 1 bit
STX (1 byte) + CMD (3 byte) + ETX (1 byte) = 1 block
STX is 02h, ETX is 03h, CMD is command string (Uppercase character)
5-13
Table 5-9 RS-232C connection signals
Pin No.
Signal name
2
RXD
3
TXD
4
DTR
Data terminal ready
5
S. G
6
DSR
7
RTS
Transmission request
8
CTS
Transmission enable
Conditions
Signal content
I/O
Receive data
I
Transmit data
O
O
Signal ground
I
Data set ready
I
O
I
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