Shenzhen KYL Communication Equipment Co., Ltd

5

1. Power supply

The factory default setting is +5V (needing 3.3-3.6V, please notify us when placing

the order). Using better ripple factor, KYL-200U transceivers can also share power

supply with other equipments. If possible, a voltage-stabilizing chip with 5V

voltage is much recommended than Switch power supply. But if only switch power

supply is available, the jam caused by switch pulse should be avoided. In addition,

the reliable grounding must be used if there is other device in the system equipment.

In case of failing to connect with the ground, it can form its own grounding but

must be absolutely separated from the municipal electric supply.

2. Connection Definition with terminal

KYL-200U transceivers supply one 9-pin connector (JP1), their definitions and

connection methods with terminals are shown in Table 1.

Table 1: JP1 Pin Definitions and connection methods

Pin No. Signal Name Function

Level

Connection

with terminal

Remarks

1

GND

Grounding of power supply

Ground

2

Vcc

Power supply DC

5V

3

RxD/TTL

Serial data input to the transceiver

TTL

TxD

4

TxD/TTL

Transmitted

data

out

of

the

transceiver

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 (input)

TTL

Sleep signal

High

level

sleep

9

RESET

Reset signal(input)

TTL

Negative

pulse reset

3. The connection schematic diagram between computer and our RF module