© Microhard Systems Inc.
22
3.0 Hardware Features
Caution:
Using a
power supply that
does not provide
proper voltage may
damage the
IPn4G
unit
.
3.1.2 Connectors and Indicators
3.1.2.1 Front
On the front of the IPn4G is the COM1 port, CONFIG Button, RSSI, STATUS, RF and SGNL LED’s as
described below:
The
COM1
port (RS232) is used for:
AT Command Interface at 115.2kbps and
HyperTerminal (or equivalent).
User data (RS232 - RxD, TxD, and SG)
CONFIG (Button) -
Holding this button depressed while
powering-up the IPn4G will boot the unit into
FILE SYS-
TEM RECOVERY
mode. The default IP address for system
recovery (only - not for normal access to the unit) is static:
192.168.1.39.
If the unit has been powered-up for some time (>1 minute), depressing the CFG Button for 8 seconds will
result in FACTORY DEFAULTS being restored, including a static IP address of 192.168.168.1. This IP
address is useable in a Web Browser for accessing the Web User Interface.
RF(Red)/SGNL(Green) LED’s -
When the unit is equipped with WiFi, the RF/SGNL LED’s indicate WiFi
activity. In units not equipped with WiFi, the RF/SGNL LED’s indicate carrier (cellular) traffic. Also, during
system bootup, the RF & SGNL LED’s will flash.
Receive Signal Strength Indicator (RSSI) (3x
Green) -
As the received signal strength increases,
starting with the furthest left, the number of active
RSSI LEDs increases.
STATUS LED (Red) -
The Status LED indicates that
power has been applied to the module.
SIM Card -
This slot is used to install a SIM card pro-
vided by the cellular carrier to enable communication
to their cellular network. Ensure the SIM card is in-
stalled properly by paying attention to the diagram
printed above the SIM card slot.
Drawing 3-4:
IPn4G Front View
Signal
Name
PIN
#
Input or
Output
RXD
2
O
TXD
3
I
SG
5
Table 3-1: COM1 Port RS232 Pin Assignment
Signal Level
(dBm)
RSSI1
(Left)
RSSI2
(Mid)
RSSI3
(Right)
(-85, 0]
ON
ON
ON
(-90, -85]
ON
ON
FLASH
(-95, -90]
ON
ON
OFF
(-100, -95]
ON
FLASH
OFF
(-105, -100]
ON
OFF
OFF
(-109, -105]
FLASH
OFF
OFF
Other
SCANNING SCANNING SCANNING
Table 3-
2: RSSI LED’s
