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PRODUCT OVERVIEW
Descriptions of LEDs
The top panel contains the following LEDs:
Power and Terminal Ready LEDs—The Power LED indicates that DC power is present and the TR LED
indicates when the unit is ready to receive data.
Modem LEDs—Two modem LEDs indicate carrier detection and link status.
Signal LEDs—Three signal LEDs display the signal strength level of the wireless connection.
LED Indicators
POWER
Indicates presence of DC power when lit.
TR
Terminal Ready. When lit, indicates connection to terminal emulation. When not lit,
indicates no terminal is present.
CD
Carrier Detect. Indicates established data connection when lit.
LS
Link Status.
PROG. SIGNAL
To use these LEDS, control them from the host system using the AT#GPIO command. See
the AT Commands Reference Guide for more information.
10
(for serial only)
(for serial only)
OFF — No power to the cellular radio
Continuously lit — SIM is not installed, or no signal is present
Slow blink — Powered and searching for a connection, or connected
The LEDs map to particular GPIO on the radio:
GPIO2: Controls the LED with a single bar above it
GPIO3: Controls the LED with two bars above it
GPIO4: Controls the LED with three bars above it
AT command examples:
AT#GPIO=2,0,1 - Turn LED 1 OFF
AT#GPIO=2,1,1 - Turn LED 1 ON
AT#GPIO=3,0,1 - Turn LED 2 OFF
AT#GPIO=3,1,1 - Turn LED 2 ON
AT#GPIO=4,0,1 - Turn LED 3 OFF
AT#GPIO=4,1,1 - Turn LED 3 ON
®
MultiConnect
Cell MTC-LAT1 User Guide
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