Connectors: Power And Serial Interface - Digi Connect EM Hardware Reference Manual

C o n n e c t o r s : P o w e r a n d S e r i a l I n t e r f a c e
Another option for both signal reception and design flexibility is to use a "pig tail" cable
Digi part number DC-ANT-EC to separate the antenna from the module. This allows the
module to fit inside your product but the antenna to be placed outside the device.

Connectors: Power and Serial Interface

This single 12-pin, serial interface port (labeled P4 for Digi Connect EM and P5 for Digi
Connect Wi-EM) supports 2 TTL serial interfaces, data rates up to 230 Kbps and full-
modem control (on port 1). See the figure for help locating pins and the table for pin
assignments.
Power and Serial Interface
1 4
D i g i C o n n e c t E M & D i g i C o n n e c t W i - E M H a r d w a r e R e f e r e n c e
Power and Serial Interface Pin Assignments
Pin Signal Name
1 VCC
2 GND
3 RXD/GPIO-7
4 TXD/GPIO-6
5 RTS/GPIO-4/SPI_CLK
pin 1
2
3 4
5 6
7 8
9 10
11 12
Description and Notes
+3.3 VDC (input only)
Reference Ground for input power
Port 1 RXD (input)/GPIO-7
Port 1 TXD (output)/GPIO-6
Port 1 RTS/GPIO-4/SPI clock