H330SS LGA Module Hardware User Manual Page 27 of 38
5.5
UART Interface
5.5.1
UART Interface Description
H330S wireless communication module provides two UART, one is 8 wire serial bus interface, and the other is a
2 wire serial bus interface.
8 wire serial bus interface (UART1) supports flow control; users can download software or send/receive AT
through UART1. 2 wire serial bus interface (UART2) supports a few AT Commands.
Note: UART2 only supports some common query functions.
UART1 and UART2 signal description:
UART1
Pin#
Pin Name
I/O
Description
35
UART1_RI
O
UART1 Ring Indicator
36
UART1_DSR
I
UART1 DTE Ready
37
UART1_DTR
O
UART1 DCE Ready
38
UART1_DCD
O
UART1 Carrier Detect
39
UART1_CTS
I
UART1 Clear to send
40
UART1_RTS
O
UART1 Request to send
41
UART1_TXD
O
UART1 Transmitted Data
42
UART1_RXD
I
UART1 Received Data
UART2
Pin#
Pin Name
I/O
Description
44
UART2_RXD
I
UART2 Transmitted Data
45
UART2_TXD
O
UART2 Received Data
