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A Appendices
The host device is detecting the
absence of a response as an
error after broadcasting a
command or sending a software
reset command.
The host device sent another
command before receiving a
response from the Controller.
The host device sent the next
command too soon after
receiving a response from the
Controller.
The communications line became
unstable when the Controller's
power was turned ON or
interrupted, and the host device
read the unstable status as data.
The communications data was
corrupted by noise from the
environment.
A - 4
Item
The Controller does not return responses for broadcast or
software reset commands.
Always read the response after sending a command
(except for broadcast or software reset commands).
Wait for at least 2 ms after receiving a response before
sending the next command.
Initialize the reception buffer in the host device before
sending the first command and after turning OFF the
power to the Controller.
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.
Confirmation
E5@D Digital Temperature Controllers Communications Manual (H225)
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4-6
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