What is designed cable line length with consideration of distance to the interface converter location?
The limit length for each measuring line of network is 1 km, but note that in this case data will be transferred at minimum rates. At the same time, it must be taken into consideration that total resistance of the data line loop must not exceed 100 Ohm, and power supply circuit resistance must provide sufficient voltage (more than 9V) for the module at the far (in relation to the interface converter) end of the measuring line. To construct measuring lines, it is recommended to use twisted pair cable with impedance 120 Ohm.
Do not use cables of different types in one measuring line.
If a measuring line cable must be laid in parallel with power cables, use a shielded cable.
Follow recommendations in the table when choosing a type of cable:
|Bus Length ||Cable Type ||Cable ||Terminal |
|Linear Resistance ||Cross-section |
|m || ||mОhm/m ||mm2 ||Ω±1% ||Kbps |
|0 to 40 ||AWG23 |
|70 ||0.25 to 0.34 ||124 ||1,000 at 40 m |
|40 to 300 ||AWG22 |
|<60 ||0.34 to 0.6 ||150 to 300 ||>500 at 100 m |
|300 to 600 ||AWG20 ||<40 ||0.5 to 0.6 ||150 to 300 ||>100 at 500 m |
|600 to 1000 ||AWG18 ||<26 ||0.75 to 0.8 ||150 to 300 ||>50 at 1 km |