Appendix
Appendix
A-4
There is a mistake in programming in the
host device.
Use a line monitor to check the commands. Check operation
using a sample program.
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The host device is detecting the absence
of a response as an error before it
receives the response from the Control-
ler.
Shorten the send data wait time in the Controller or increase
the response wait time in the host device.
1-6
The host device is detecting the absence
of a response as an error after broadcast-
ing a command or sending a software
reset command (except for SYSWAY).
The Controller does not return responses for broadcast or
software reset commands.
2-2
2-14
5-2
5-14
The host device sent another command
before receiving a response from the
Controller.
Always read the response after sending a command (except
for broadcast or software reset commands).
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The host device sent the next command
too soon after receiving a response from
the Controller.
Wait for at least 2 ms after receiving a response before send-
ing the next command.
1-3
The communications line became unsta-
ble when the Controller’s power was
turned ON or interrupted, and the host
device read the unstable status as data.
Initialize the reception buffer in the host device before send-
ing the first command and after turning OFF the power to the
Controller.
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The communications data was corrupted
by noise from the environment.
Try using a slower baud rate.
Separate the communications cable from the source of noise.
Use a shielded, twisted-pair cable for the communications
cable.
Use as short a communications cable as possible and no not
lay or loop extra cable.
Do not run the communications cable parallel to a power line
to prevent inductive noise.
If noise countermeasures are difficult to implement, use an
Optical Interface.
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