ICP DAS USA GW-7228 User Manual page 19

Table 2-4: Cable selection
Bus speed Cable type
50k bit/s 0.75~0.8mm2
at 1000m
100k bit/s 0.5~0.6 mm2
at 500m
500k bit/s 0.34~0.6mm2
at 100m 22AWG, 20AWG
1000k bit/s 0.25~0.34mm2
at 40m 23AWG, 22AWG
Note: The AWG means a standard method used to measure wire. The
numbering system works backwards from what people would think, the
thicker (heavier) the wire, the lower the number. For example: a 24AWG
wire is thicker/heavier than a 26AWG wire.
GW-7228 J1939/Modbus RTU Slave Gateway User's Manual (Ver 1.3, Apr/2011) ------------- 19
Resistance/m
70 mOhm
18AWG
< 60 mOhm
20AWG
< 40 mOhm
< 40 mOhm
Cable
Terminator Bus Length
150~300
Ohm
150~300
Ohm
127 Ohm
124 Ohm
600~1000m
300~600m
40~300m
0~40m