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Connect a male (D-Sub 9 Pin) to female (D-Sub 9 Pin)
straight cable for RS-232C external control by host
equipment.
• The RS-232C host can control functions of the PMD560
externally.
• The PMD560 automatically transmits status data when
status is changed.
• The PMD560 will respond to status requests by
transmitting the associated status data.
RS-232C specifications:
Connector pin assignment
Physical specifications
Flow control and timing
CTS/RTS hardware flow control
RS-232C control
Timing chart
1. The host requests data by setting RTS to H.
2. Upon data request by RTS, the PMD560 responds by
setting CTS to H if not busy.
3. The host checks if CTS is H and starts data output on
TX.
4. When data output finishes, the host sets RTS to L.
5. The PMD560 checks if RTS is L and sets CTS to L.
Command format
Start character: "@"
End character: 0Dh
Basic format
Received okay and error codes
OK (data receive successful) (ACK): 06h
Error (data receive error) (NACK): 15h
Normal Return Error Return
Note:
• The receiving side ignores data received prior to "@". If
code data is received without receiving "@", the data
receive error code will be returned.
• The tolerance for send/receive clock error is ±3.5%.
• For sending a command, wait more than 20ms after
reception of a response (OK, ERR or Status).
• Reception of 0Dh or timeout is used to determine the
end of a command. Timeout occurs 1 second after the
reception of the last byte.
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