Industrial Bus

TDx01D485 Series

2015.09.16-A/3

Page 1 of 4

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single RS485 isolation transceiver module

FEATURES



Two-terminal isolation ( input and output are

mutually isolated)



Integrated Isolated DC/DC converter



Bus protection



Isolation voltage :2.5KVDC



Operating temperature range:-40℃~+85℃



Baud rate 9600bps



Connect up to 32 nodes on one bus

TD301D485/TD501D485 series are transceiver isolation module with integrated duplex power isolation, electrical isolation, and RS485

interface bus protector ; Products can be easily embedded in the user equipment, achieve function of RS485 network connection.

The isolation RS485 circuits of using a piece of power isolation module, three light couplings and RS485 transceivers and device are only

need to adopt a RS485 isolation module now. Simplify the customers on the isolation requirements of the design.

Selection Guide

Part No.

Power Supply input (VDC)

TD301D485

3.17~3.45

TD501D485

4.75~5.25

Input Specifications

Item

Operating Conditions

Value

Input Power

Supply

Static current

Products energized, no communication

TD501D485≤30 mA,TD301D485≤40mA

Send current

9600bps Square wave communication

TD501D485≤40 mA,TD301D485≤60mA

Input

Serial interface

TD301D485 compatible with + 3.3 V UART interface

TD501D485 compatible with + 5 V UART interface

Pin current

Bus Interface

Item

Operating Conditions

Value

Output

RS485 bus interface

Standard interface RS485 ,pull-up and pull-down resistor, whose

value is 4.7K,have been set to A/B line.

Transmission Specifications

Item

Operating Conditions

Value

Data Rate

9600bps (max.)

Transceiver Switching Delay

The delay time from the receiving data switch to the send

data : 30 μs(min.), 100 μs(max.).

The Number of Nodes

Connect up to 32 nodes on one bus

Transceiver Control

Contrary to common RS485 transceiver control level

Truth Table

Sending Status

Control

Input

Output

CON

TXD

A

B

Line state

0

1

1

0

Normal

0

0

0

1

Normal

Receiving Status

Control

Input

Output

CON

A-B

RXD

1

≥

0.2V

1

1

≤

-0.2V

0