User`s manual

Connection Option and Cable Wiring
Intellio C320Turbo User's Manual 5-9
RS-422 Impedance Matching
When an electrical signal travels through two different resistance junctions in a
transmission line, the 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.
It is normally sufficient when the value of the termination resistor equals the
characteristic impedance of the transmission line. The resistors should be added near
the receiving side. See below.
C32061T/65T Remote site
3 TxD+(B) RxD+(B)
16 TxD-(A) RxD-(A)
2 RxD+(B) TxD+(B)
14 RxD-(A) TxD-(A)
5 RTS+(B) CTS+(B)
13 RTS-(A) CTS-(A)
4 CTS+(B) RTS+(B)
19 CTS-(A) RTS-(A)
Note:
1. stands for termination resistor near the receiving side.
2. The suggested termination resistor for AWG #26 cable is 100 ohm.
3. The suggested termination resistor for phone cable is 600 ohm.