NAL RESEARCH CORPORATION A3LA-RM Quick Start Manual page 2

DEVICE DESCRIPTION (continued)
 DB-25 Multi-Interface Connector: The multi-interface connector is a male 25-pin miniature D-sub type.
 Antenna: NAL Research recommends the SYN7391-C antenna.
CAUTION: Do not connect or disconnect the antenna while
device is powered..
 Status LEDs: P) LED lights up when power is provided, I) stays solid when the signal
strength is between 3–5, S) lights up when the A3LA-RM is in data mode
 RS232 Data Interface: This interface allows a connected DTE to utilize the A3LA-R's
modem functionality through standard AT and extended sets of AT commands.
 POWER: The A3LA-RM accepts either 4.0 V – 5.4 V or 5.0 V – 32.0 V input through pin #4 and pin #16. Note that two
pins are provided for the external DC input and two pins are provided for the associated external ground input (pin# 3
and pin#17). The A3LA-RM is shipped with hardware set for +5.0 V to +32 V input. It can be changed to +4.0 V to +5.4 V
input through an internal jumper. The modem will automatically be ON/OFF when DC power is applied/removed.
Change Voltage Input to +4.0 V to +5.4 V

CAUTION: DISCONNECT POWER BEFORE RESETING THE JUMPER

1. With the device turned off, remove the modem's bottom
plate to find the jumper.
2. Set the red jumper onto the middle and left pins.
NOTE: To reset the input voltage range back to 3.6 V to +5.3
V, set the red jumper onto the middle and right pins.
A3LA-RM/A3LA-RM-MIL
QUICK START GUIDE
Support Phone#: 571-833-2169
Support@Nalresearch.com
451-93156-014B
2023-03-31
SYNC7391-C
Red jumper used
to set input
voltage range
2