Panasonic GT703, User Manual

Page: 31 / 105

3.2 Wiring the Power Supply
3-7
3.2.3 Wiring the COM Port

Accessory communication connector/applicable wiring
The communication connector used for the COM port (provided as an accessory with the
main unit) has a screw-tightening type of terminal block. Use the following items for wiring.

Suitable wires (strand wire)
Size Cross-sectional area
AWG28 to 16 0.08 to 1.25mm
2

Use a special tool to tighten the terminal block of the communication connector.
Use a screwdriver made by us. (Product number: AFP0806) The tightening torque should be
0.22 to 0.3 Nm.

When doing RS485 communication using RS422 type
Please use the following cables or equivalent.

Suitable wires (strand wire)
Classification Cross-sectional view
Conductor Insulator
Cable
diam.
Sample
appropriate cable
Size
Resistance
(at 20 ° C)
Material Thick-
ness
Shielded
twisted pair
1.25 mm
2
（
AWG16
）
or more
Max.
16.8 Ω/km
Poly-
ethylene
Max.
0.5mm
Approx.
8.5 mm
Hitachi Cable, Ltd.
KPEV-S1.25mm
2
×
1P
Belden 9860
0.5 mm
2
(AWG20)
or more
Max.
33.4 Ω/km
Poly-
ethylene
Max.
0.5mm
Approx.
7.8mm
Hitachi Cable, Ltd.
KPEV-S0.5mm
2
×
1P
Belden 9207
•
Use shielded twisted pair cables.
•
Use only one type of transmission cable. Do not mix more than 1 type.
• When using shielded cable with crossover wiring for the RS485
transmission line, grounded one end.