Chengdu Ebyte Electronic Technology Co,;Ltd E30 -490T20S user manual
Copyright ©2012–2019
，
Chengdu Ebyte Electronic Technology Co,;Ltd
5
Size
17 * 30 mm
Antenna
IPEX/External/Spring
50 ohm impedance
3 Size and pin definition.
No.
Name
Direction
Function
1
M 0
Input
（
Weak pull-up
）
Work with M1 to decide 4 working modes of module (not suspended, if
not used, could be grounded).
2
M 1
Input
（
weak pull-up
）
Work with M0 to decide 4 working modes of module (not suspended, if
not used, could be grounded).
3
RXD
Input
TTL UART inputs, connects to external (MCU, PC) TXD output pin. Can
be configured as open-drain or pull-up input.
