Moxa CP-114-DB25M Instrukcja Użytkownika Strona 42
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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)
5-6 Industio CP-114 User's Manual
JP1
JP2
JP4
JP3
Industio CP-114 Series Board
ON
1 2 3 4
ON
1 2 3 4
RS-232 RS-422
RS-485
JP5
RS-232
RS-422
RS-485
JP6
By RTS RS-422
SW2 SW1
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
A
UTO RS-485
JP1/2/4/3:Termination Resistor Jumper for Port 1/2/4/3
- ’s Manual 1
- About This Manual 3
- Table of Contents 4
- Introduction 5
- Features 6
- Check List 7
- Installation Guide 7
- Hardware Installation 8
- Connecting the Fan-out Cable 9
- Software Installation 10
- Configuring Board and Port 14
- Adding/Removing Board 14
- Updating Driver 14
- Windows 95/98 15
- Board and Port Ready Stage 20
- Removing Driver 23
- Installing Driver 24
- Driver Setup 25
- Loading Driver 28
- Unloading Driver 28
- Serial Programming Tools 29
- Utilities 30
- Terminal Emulator 32
- Installing API-232 33
- DOS API-232 Library 33
- Data Scope 34
- Diagnose 34
- RS-485 Programming 35
- RS-232 Cable Wiring 37
- RS-422 Cable Wiring 40
- RS-485 Cable Wiring 41
- 1 2 3 4 42
- 1 2 3 4 42
- Troubleshooting 44
- Technical Reference 46
- UART 16C550C 47
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