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Impedance matching and termination resistors, Impedance matching and termination resistors -6, Industio cp-114 user's manual – Moxa Technologies CP-114 Series User Manual

Page 46: Industio cp-114 series board

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5-6

Industio CP-114 User's Manual

Impedance Matching and Termination Resistors

For RS-422/485 serial communications, when an electrical signal travels through two different
resistance junctions in a transmission line, the impedance mismatch will sometimes cause signal
reflection. Signal reflection causes signal distortion, which in turn will contribute communication
errors. The solution to this problem is to establish the same impedance at the line ends as in the line
itself by terminating them with resistors.

Industio CP-114 Series already installs the resistors on board for your convenience, indicated as
follows. The value of the termination resistor should equal the characteristic impedance of the
transmission line. Resistors should be added near the receiving side. Note: Stands for termination
resistor near the receiving side.

CP-114 Series

RS-422/485 Device


2

TxD+(B)

RxD+(B)

1

TxD-(A)

RxD-(A)

3

RxD+(B)

TxD+(B)

4

RxD-(A)

TxD-(A)

7

RTS+(B) CTS+(B)

6

RTS-(A) CTS-(A)

8

CTS+(B) RTS+(B)

9

CTS-(A)

RTS-(A)










JP1
JP2
JP4
JP3

Industio CP-114 Series Board

ON

1 2 3 4

O
N

1 2 3 4

RS-232

RS-422
RS-485
JP5

RS-232

RS-422
RS-485
JP6

By RTS RS-422

SW2 SW1

AUTO RS-485

JP1/2/4/3:Termination Resistor Jumper for Port 1/2/4/3

JP5:Interface selection Jumper for Port 1

JP6:Interface selection Jumper for Port 2

SW1: RS-422/RS-485 Selection Switch for Port 1/2/3/4
SW2: Data Mode Switch for Port 1/2/3/4