User`s guide

characters were transmitted between the TCC-100’s RS-232 port and

RS-422/485 terminal block connector.

STEP 6: Placement Options

In addition to placing the TCC-100 on a desktop or other horizontal

surface, you may also use the DIN-Rail or wall mount options, as

illustrated below.

DIN-Rail

Wall Mounting

Termination Resistor Diagram

Termination is designed to mitigate

noise from the RS

-422/485

transmission signal

s. If the network

cable is too

long, undesirable

transmission

-line effects could arise.

The best method for mitigating

energy on an unused conductor is to

dissipate the

energy as heat by

terminating both ends of the unused

conductor to ground with resistors (

this method is called bi-directional

termination).

The resistance of the resistors should be equal to the

characteristic impedance of the line. The most common RS

-485 twisted

pair has a characteri

stic impendence of 100 to 120 ohms. Moxa’s

termination technique is bi

-directional termination, which offers excellent

signal integri

ty. With this technique, the line drivers can be located

anywhere on the network.