The TX and RX are with DE-9M connect or, TX: Female connector; RX: Mode connector.
DE-9 Male
（
Pin Side
）
DE-9 Female (Pin Side
）
-------------
-------------
\ 1 2 3 4 5 /
\ 5 4 3 2 1 /
\ 6 7 8 9 /
\ 9 8 7 6 /
---------
---------
RS-232 Pin Definition
TX PIN Definition PIN Definition
1 NC
2 TxD
3 RxD
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
RX PIN Definition PIN Definition
1 NC
2 RxD
3 TxD
4 NC
5 GND
6 NC
7 NC
8 NC
9 NC
Baud Rate: 2400 (Default)
Data Bit: 8 bits
Parity: None
Stop Bit: 1 bit
Flow Control: None
Besides, we provide a 3 Bit DIP switch to select other 7 kinds baud rate. The 3 Bit switch is
binary as well, when pull up its value is “0”; when pull down, its value is “1”. So it comes with
000, 001, 010...111, total 8 kinds, they match some baud rate as bellow
