Chapter 7. TROUBLESHOOTING
■ Check items in case communication is disabled
(1) Check the power supply.
(2) Check the wiring.
(3) Check if the communication conditions for the CMQ-V Series meet those for
the host computer.
If any one of the following setting items is different between both stations,
communication is disabled:
The underlined items mean that they can be set on the CMQ-V Series side.
Transmission seed : 38400
, 19200, 9600, 4800, 2400bps
Data length : 7, 8 bits
Parity : No parity, odd parity, even parity
Stop bit : 1 stop bit, 2 stop bits
(4) Check if the destination address of the command frame transmitted from the
host computer meets the address set to the CMQ-V Series.
The address of the CMQ-V Series set to “0” for factory setting.
Even when the destination address of the command frame is set to 00 (30H,
30H), the CMQ-V Series does not respond to such a message.
(5) Use the upper-case character codes for all the character codes other than the
device code (“X” or “x” in this controller).
(6) Are those multi-dropped controllers belong operated themselves with different
device address setups?
(7) Is the communication timing conformed with the Chapter 4-5 Timing
Specifications (page 16)?
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