Panasonic FP0R - Connection of COM Port (RS485 Type); Selection of Transmission Cables (RS485 Type)

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5.7.2 Connection of COM Port (RS485 Type)
- Wiring should extend from one unit to the next, between "+" terminals, and "-" terminals as below.
Never run two wires from a single unit to two other units.
- In the unit that serves as the terminal station, connect the "E" terminal and "-" terminal.
5.7.3 Selection of Transmission Cables (RS485 Type)
Please use the following cables as transmission cables.
Appropriate electrical cables (twisted cables)
Type
Cross-sectional
view
Conductor
Insulator
Cable
diam.
Sample
appropriate
cable
Size
Resist-
ance
(at 20°C)
Material
Thick-
ness
Shielded
twisted
pair
0.5 mm
2
(AWG20)
or greater
Max.
33.4
Ω/km
Polye-
thylene
Max.
0.5 mm
Approx.
7.8 mm
Belden 9207
Hitachi Cable,
Ltd. KPEV-
S0.5 mm
2
x
1P
VCTF
0.5 mm
2
(AWG20)
or greater
Max.
37.8
Ω/km
Polychlo-
rinated
biphenyl
Max.
0.6 mm
Approx.
6.2 mm
VCTF-0.5
mm
2
x 2C(JIS)
Note:
- Use shielded twisted pair cables.
- Use only one type of transmission cable. Do not mix more than 1 type.
- Twisted pair cables are recommended in noisy environments.
- When using shielded cable with crossover wiring for the RS485 transmission line, grounded one end.
- If two wires are connected to the plus terminal and minus terminal of RS485, use the wires of the same
cross-sectional area which is 0.5 mm
2
.