USGlobalsat EM-408 User Manual
Page 5
EM-408
Specifications are subject to be changed without notice.
Page 5 of 14
Version 1.4.1
Pin Assignment
Pin Explanation
ENABLE/DISABLE: On / Off
VCC:
(DC power input) This is the main DC supply for a 3.3V power module board.
TX:
This is the main transmit channel for outputting navigation and measurement data to user’s
_
navigation software or user-written software.
RX:
This is the main receive channel for receiving software commands to the engine board from
SiRfDemo software or from user-written software. (
NOTE
: When not in use this pin must be
kept “HIGH” for operation. From Vcc connect a 470 Ohm resistor in series with a 3.2v Zener
diode to Ground. Then, connect the Rx input to Zener’s cathode to pull the input “HIGH”.)
GND:
GND provides the ground for the engine boards. Be sure to connect all grounds.