DFRobot TEL0070 Manual - Page 2

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PIN Function Description

Points to note:

1. Multiplexer board is divided into Area A and Area B. Area A includes Micro USB、ATTL and A232

interfaces. Area B includes BTTL、B232、B485 interfaces. The signal can be convertered between

A and B.

2. The signal in the same area can't be convertered. For example, ATTL can't be converted to A232,

but it can be convertered to B232.

3. Only one input in the same area, but it allows to have multiple outputs.For example，if micro USB

interface in A is input，multiplexer can be allowed to have 232、485 and TTL as outputs.

Indicator： POWER:power indicator AR->BT: The interface in A as input，the interface in B as

output BR->AT: The interface in B as input, the interface in A as output

Usage Direction

Sample descripition: The multiplexer board achieve USB to TTL, micro USB interface in A as input

and the TTL interface in B as output. The operation is same for USB to 232 and 485.Similarly, the

reverse converter B to A is also feasible,such as 232 to USB,485 to USB, TTL to USB.

STEP 1：Hardware Requirements

1. DFRduino UNO R3

2. USB Cable A-B for Arduino

3. Micro USB Cable

4. Arduino Jumper Cables

STEP 2：Connection

1. Plugin Micro USB cable to multiplexer board. The "POWER" LED turns on at the same time.