7 - 1
7
NX-series Communications Interface Units User’s Manual (W540)
The CIF Units support no-protocol communications as the communications protocol.
This section describes the communications protocol and the serial communications
specifications.
7-1 No-protocol Communications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3
7-2 How Data Is Sent and Received . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
7-2-1 How Data Is Sent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4
7-2-2 How Data Is Received . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5
7-3 Data Used by the Serial Communications Protocol . . . . . . . . . . . . . . . . . . 7-6
7-3-1 Input Notification Data and Output Notification Data . . . . . . . . . . . . . . . . . . . . 7-6
7-3-2 SIDs and SID Responses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
7-3-3 Input Data Type and Output Data Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10
7-3-4 Send Completed Toggle Bit . . . . . . . . . . . . .
.
. . . . . . . . . . . . . . . . . . . . . . . . 7-10
7-4 Examples of Communications between CPU Unit or
Communications Master and CIF Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
7-4-1 Example of Sending Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13
7-4-2 Example of Receiving Data . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . 7-16
7-4-3 Simultaneously Sending and Receiving Data . . . . . . . . . . . . . . . . . . . . . . . . . 7-19
7-4-4 Example for a Parity Error duri
ng Data Reception . . . . . . . . . . . . . . . . . . . . . 7-21
7-4-5 Example of Control Command Execution . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-23
7-5 User Programming to Send Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27
7-5-1 Creating and Outputting Output Notification Data . . . . . . . . . . . . . . . . . . . . . 7-27
7-5-2 Checking Input Notification Data
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27
7-5-3 Processing Send Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-27
7-6 User Programming to Receive Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-28
7-6-1 Checking Input Notification Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-28
7-6-2 Creating and Outputting Output Notification Data
. . . . . . . . . . . . . . . . . . . . . 7-28
7-6-3 Determining Conditions to Start Reception
and Conditions for the Completion of the Reception .
. . . . . . . . . . . . . . . . . . 7-28
7-6-4 Precautions for Writing User Programming to Receive Data . . . . . . . . . . . . . 7-28
7-7 User Programming to Restart a Port . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30
Serial Communications
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