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RS-232C Interface
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1. D-Sub 9-pin Connector Specifications
2. Data Format
Mode: Asynchronous
Character Length: 8bit
Parity Check: None
Stop Bit: 1bit
Data Speed: 9600bps
3. Command Format and ACK/NAK
Control: No control sequence
• The ACK (NAK) response will be returned within 200ms for a 1byte transmission command from the CPU.
• The NAK response is returned only when a non-defined command is received (however, NAK is returned for certain
commands depending on the status.)
• The parameters for data that have elapsed for five or more seconds after the previous receipt are not recognized as
parameters.
• Only one retry is made when a time-out is triggered. In this event, the resending is performed from the first byte of the
relevant command.
4. SENS Commands
1. Electrical Specifications
Pin No. Signal Operations
Signal Direction
3 TXD Sending data HDR → CPU
2 RXD Receiving data HDR ← CPU
6 DSR Data set ready
HDR ← CPU
5 GND Signal earth
4 DTR
Data terminal ready
HDR → CPU
12
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345
Output level
OFF:
—
5V or less
ON : +5V or more
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
0(SPACE) Start
1(MARX)
Stop
bit bit
Configuration
TXD
RXD
CMD
ACK
200ms
ACK ACK
Para1 Para2
TXD
RXD
CMD
DATA
200ms
200ms
DATA
RS-232C Interface