Pin No.

Signal

Name

Function

Level

Connection with terminal

Remarks

1

GND

Grounding of power supply

Ground

2

VCC

Power supply DC

5V DC

3

RxD/TTL

Data receiving

TTL

TxD

4

TxD/TTL

Data transmitting

TTL

RxD

5

SGND

Signal

6

A (TXD)

A of RS-485 (TxD of RS-232)

A(RxD)

7

B (RXD)

B of RS-485 (RxD of RS-232)

B(TxD)

8

SLEEP

Sleep control

TTL

Sleep signal

Low level valid

9

TEST

Factory testing