LTE Module Series
Smart EVB User Guide
Smart_EVB_User_Guide Confidential / Released 20 / 29
Figure 15: Main UART Port (J901)
Table 7: Pin Assignment of J901
3.6. Switches and Buttons
Smart EVB comprises nine buttons (S901/S902/S903/S904/S905/S906/S907/S908/S909) and four
switches (S801/S802/S803/S804). Description of switches and buttons is shown as below.
J401
Pin Name
I/O
Description
1
Not connected
2
RS232_TXD
I
Transmit data
3
RS232_RXD
O
Receive data
4
Not connected
5
RS232_GND
Ground
6
Not connected
7
RS232_CTS
I
Clear to send
8
RS232_RTS
O
Request to send
9
Not connected
1 2 3 4 5
6 7 8 9
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