Shenzhen KYL Communication Equipment Co., Ltd
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4
can also share power supply with other equipments. If available, a
voltage-stabilizing chip with 3.6V voltage is more recommended as the power
supplier than Switch power. But if only switch power supply available, the jam
caused by switch pulse should be avoided. In addition, a reliable grounding must be
used if there are other devices in the system. 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-500L transceivers provide 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