7 DATA COMMUNICATIONS USING BIDIRECTIONAL PROTOCOL
7.1.2 Arrangement and contents of the receive area and the receive data
This section shows the arrangement and contents of the receive area and the receive data for performing data reception using the bidirectional protocol.
(1) Receive area
CH1
address
600H
601H
to
7FFH (Default)
The receive area is a memory that stores the received data length (receive data count) and data area received from an external device.
The receive area is allocated to addresses 600H to 7FFH (CH1 side) and A00H to BFFH (CH2 side) at initial setting.
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| • The units of data length (word/byte) is in accordance |
Buffer memory |
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| with the word/byte units designation in GX | ||
area |
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| • Data length |
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Receive data count storage area |
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| The contents of data length of the received | |||
Receive |
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| message are stored. |
Receive data storage area |
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| • Data area | ||
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| The contents of the data area of the received |
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| message are stored in ascending address order. |
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7 - 4 | 7 - 4 |