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9. Appendix
9. 5. 2-wire Jbus schematic
Schematic diagram:
Type of trunk cable Cable with 1 shielded twisted pair
Maximum length of bus 1,300 m at 19200 bps
Maximum number of stations (without
repeater)
32 stations, i.e., 31 slaves
Maximum length of tap links 3 m
Bus polarization One 470 Ω pull-up resistor to the 5 V
One 470 Ω pull-down resistor to the 0 V
This polarization is often provided in the master.
Line termination One 150 Ω resistor
Common polarity No
470 Ω
470 Ω
150 Ω 150 Ω
5 V
0 V
G
R
G
R
G
R
L- (B/B')
L+ (A/A')
Master
Slave 1
Slave n