Contec CPS-MG341G-ADSC1-930 Hardware Manual page 29

- Half Duplex
Half duplex needs two or more couples of twisted-pair.
One set is for a signal line, other free line(s) is (are) for the signal ground (SG).
Please connect TX + and TX- to make them as a couple of twisted pair wire.
Product
TX+
TX-
SG
Figure 2.14. RS-422A/485 Half Duplex Communication
- Full Duplex
Full duplex needs three or more couples of twisted-pair.
Two sets are for signal lines, other free line(s) is (are) for the signal ground (SG).
Please connect TX+ and TX-, RX + and RX- respectively to make them as couples of twisted-pair wire.
Product
TX+
TX-
RX+
RX-
SG
Figure 2.15. RS-422A/485 Full Duplex Communication
Notes on the shield connection
- Ground the shield to the frame ground (FG) of the external device.
- If there is no terminal or/and place for grounding, please use an unshielded cable
- Do not ground to Power GND.
- Shield is not used as the signal ground (SG).
CAUTION
- Tightening torque of the attached connector is 0.25N·m.
- For wiring, strip off approximately 7mm (plus or minus 0.5mm) of the covered part of a wire rod to
use.
- If the shielded cables are incorrectly wire-connected to the ground, the shield might become an
antenna picking up noises or become a source of noise.
- If you find the problems, remove the grounding of the shield.
- About a caution mark
Please use copper wires that tolerate the temperature of 75 degrees Celsius and higher.
CPS-MG341G-ADSC1-930 Hardware Manual
on the product:
2 Setup
External device
TX+
TX-
SG
External device
RX+
RX-
TX+
TX-
SG
23