5.2 Fuji General-purpose Communications
5-29
Chap. 5 USING STANDARD RS-485
5.2.6.2 Sum-check field
This field contains data used to check for errors in the transmission frame when sending data. The
data is calculated by adding all fields except for the S0H and sum-check fields in 1 byte increments.
The lowest 1 byte of data is expressed as an ASCII code.
Example: Sum result = 0123H
Position Default
Sum-check 1 ASCII ‘2’
Sum-check 2 ASCII ‘3’
5.2.7 Communication examples
This section illustrates representative communication examples. (In all cases, the station number is
12.)
5.2.7.1 Standard frame
(1) S01: Selecting speed setting 1 (write)
300r/min command × 20000 / max. speed: 1500 = 4000d = 0FA0H
Request frame (Host J Inverter)
SOH 1 2 ENQ W S 0 1 SP 0 F A 0 ETX 7 D
ACK response frame (Inverter J Host)
SOH 1 2 ACK W S 0 1 SP 0 F A 0 ETX 7 E
NAK response frame (Inverter J Host) ..................... Link priority error
SOH 1 2 NAK W S 0 1 SP 0 0 4 C ETX 7 D
(2) M09: Polling output frequency (read)
Request frame (Host J Inverter)
SOH 1 2 ENQ R M 0 9 SP 0 0 0 0 ETX 5 3
ACK response frame (Inverter J Host)...................... 30.00 Hz (0BB8
H
J 3000d J 30.00)
SOH 1 2 ACK R M 0 9 SP 0 B B 8 ETX 8 0
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