User Manual

Connectors: Power and Serial Interface
14  Digi Connect EM & Digi Connect Wi-EM Hardware Reference
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
Power and Serial Interface Pin Assignments
Pin Signal Name Description and Notes
1 VCC +3.3 VDC (input only)
2 GND Reference Ground for input power
3 RXD/GPIO-7 Port 1 RXD (input)/GPIO-7
4 TXD/GPIO-6 Port 1 TXD (output)/GPIO-6
5 RTS/GPIO-4/SPI_CLK Port 1 RTS/GPIO-4/SPI clock
GRN GRN
RED YEL
PIN1
PIN1
pin 1
2
3
4
5
6
7
8
9
10
11 12