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Chapter 18 Object Class Reference message may actually be getting clipped off before it is completed. Consider increasing the number of Retry attempts. You may have to increase the Receive gap Serial Port setting to ensure Lookout is receiving the entire message. If your Serial Port is configured for radio, this could be caused by an audible squelch tail occurring at the end of a radio transmission. Try adjusting RTS delay off and CTS timeout. No acknowledgment from header frame You sent an inquiry and some kind of data write or read, but the device has not responded. The object was expecting an acknowledgment for an instruction frame and did not receive it. You may be asking for an invalid memory address. Check your PLC address configuration. This object class speaks N Sequence CCM. If you are connected to the PLC port normally used for programming, you may be trying to speak to a port configured for K Sequence CCM. If another port is available, try plugging into that one. Otherwise, reconfigure the PLC port for N Sequence CCM. Invalid request frame You are probably trying to use an invalid memory address. Check your PLC address configuration. © National Instruments Corporation 18-151 Lookout Reference Manual
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