4: SPECIAL FUNCTIONS
USER’S MANUAL 4-9
Data Link Specifications
Electric Specifications Compliance with EIA-RS485
Baud Rate 19200 bps (fixed)
Maximum Cable Length 200m (656 feet) total
Maximum Slave Stations 6 slave stations
Communication Sequence
Only one slave station can communicate with the master station in one scan. When a slave station receives a command
from the master station, the slave station returns a response of processing results. When six slave stations are connected,
six scans are required to communicate with all slave stations.
Data Register Allocation for Data Link System
Master Station
Slave 1
Refresh
1 scan time
Slave Station 1
END Processed
Slave 2
Refresh
Slave 3
Refresh
Slave 4
Refresh
Slave 5
Refresh
Slave 6
Refresh
Slave 1
Refresh
Slave 2
Refresh
Slave Station 2
Slave Station 6
Master Station
D60 Link Communication Error
D61
D62
Transmission Data H
Transmission Data L
D63
D64
Receive Data H
Receive Data L
D65 Link Communication Error
D66
D67
Transmission Data H
Transmission Data L
D68
D69
Receive Data H
Receive Data L
D70 Link Communication Error
D71
D72
Transmission Data H
Transmission Data L
D73
D74
Receive Data H
Receive Data L
D75 Link Communication Error
D76
D77
Transmission Data H
Transmission Data L
D78
D79
Receive Data H
Receive Data L
D80 Link Communication Error
D81
D82
Transmission Data H
Transmission Data L
D83
D84
Receive Data H
Receive Data L
D85 Link Communication Error
D86
D87
Transmission Data H
Transmission Data L
D88
D89
Receive Data H
Receive Data L
Slave Station 1
D85 Link Communication Error
D86
D87
Transmission Data H
Transmission Data L
D88
D89
Receive Data H
Receive Data L
Slave Station 2
D85 Link Communication Error
D86
D87
Transmission Data H
Transmission Data L
D88
D89
Receive Data H
Receive Data L
Slave Station 3
D85 Link Communication Error
D86
D87
Transmission Data H
Transmission Data L
D88
D89
Receive Data H
Receive Data L
Slave Station 5
D85 Link Communication Error
D86
D87
Transmission Data H
Transmission Data L
D88
D89
Receive Data H
Receive Data L
Slave Station 4
D85 Link Communication Error
D86
D87
Transmission Data H
Transmission Data L
D88
D89
Receive Data H
Receive Data L
Slave Station 6
D85 Link Communication Error
D86
D87
Transmission Data H
Transmission Data L
D88
D89
Receive Data H
Receive Data L
If any slave stations are not connected, master station data registers which are assigned to the vacant slave stations can
be used as ordinary data registers.
Slave station data registers D60 through
D84 can be used as ordinary data registers.
To Next Page
Loading...
Need help?
General
