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24
Communications Specifications
Section 2-1
2-1
Communications Specifications
This section provides specifications for the CompoBus/S System.
Item
Specification
Communications method
Special CompoBus/S protocol
Communications baud rate
High-speed Communications Mode: 750 kbps
Long-distance Communications Mode: 93.75 kbps
Modulation method
Baseband method
Coding method
Manchester coding method
Error control checks
Manchester code check, frame length check, and parity check
Cable
VCTF cable
(JIS C 3306)
Two 0.75 mm
2
conductors (2 signal wires)
Four 0.75 mm
2
conductors (2 signal wires and 2 power supply wires)
Special Flat Cable Four 0.75 mm
2
conductors (2 signal wires and 2 power supply wires)
Communications
distance
2-conductor VCTF
cable
High-speed Communications Mode
Main line length:
100 m max.
Branch line length:
3 m max.
Total branch line length:
50 m max.
Long-distance Communications Mode
Main line length:
500 m max.
Branch line length:
6 m max.
Total branch line length:
120 m max.
4-conductor VCTF
cable
High-speed Communications Mode
Main line length:
30 m max.
Branch line length:
3 m max.
Total branch line length:
30 m max.
Long-distance Communications Mode: Flexibly branched, provided that the
total length of cable is a maximum of 200 m.
Special Flat Cable High-speed Communications Mode
Main line length:
30 m max.
Branch line length:
3 m max.
Total branch line length:
30 m max.
When 4-conductor VCTF cable or Special Flat Cable is used to connect fewer
than 16 Slaves, the main line can be up to 100 m long and the total branch line
length can be up to 50 m in High-speed Communications Mode.
Long-distance Communications Mode: Flexibly branched, provided that the
total length of cable is a maximum of 200 m.