Hitachi EH-150 Series Applications Manual page 149

 Check flow of Free protocol mode
Data send and receive
YES
Send and receive
OK?
NO
Check the return code and the program.
YES
Send and receive
OK?
NO
NO
Transmission speed
OK?
YES
NO
Transmission format
configuration OK?
YES
Connection of
NO
communication cable
OK?
YES
NO
Status of external
device normal?
Replace the module.
Reference :
 If a call-back function (the function to return the transmitted data as it is) is in external device, communication can
be tested only by the set of EH-150 and external device.
 When the transmission speed of EH-SIO is set up very low compared with the transmission speed of external
apparatus, it is impossible to detect data reception. In this case, an error does not occur.
OK
OK
Please set up a communication setting switch
again.
Please set up a communication setting switch
again.
Please connect a communication cable correctly.
Please change external device to a normal state.
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Chapter 7 System setup