User's Guide

www.lm-technologies.com

LM074 SPP with GAP Central Application v1.1

6.2.5 LM074 has settings DPIN=on, MITM=off, IO-type=no-

Input-no-output

i. Pairing with the remote device might be successful if the remote

device also has DPIN=on, MITM=off and IO-type as no one.

ii. If the remote device has MITM=on or IO type other than no input

no output, the LM074 cannot pair with that device.

7. LED Indication

7.1 Power on LED sequence

1. All LEDs blink fast during power on for 3 seconds. User can notice all

LEDs blinking approximately 6 to 7 times.

2. The module shows power on LED sequence after AT*Reset=1 and

AT*Reset=2 commands.

7.2 LED0

1. LED0 (RED LED on LM068) is constantly ON to indicate that the

module/adapter is powered and active for AT commands, Bluetooth

discovery, audio functionality.

2. If LED0 is not ON, module/adapter may not be powered correctly or

not initialised.

3. The state of LED0 is irrespective of Bluetooth connection or pairing

state.

7.3 LED1

1. LED1 (Yellow LED on adapter) indicates the data transfer in the SPP

connected state.

2. When the module/adapter is not connected to the remote SPP device,

LED1 should be OFF.

3. When the module/adapter connects to a remote SPP device, LED1 is

ON for the duration of the module/adapter receiving data or sending

data to the remote device.

4. LED1 should be off when there is no active data transfer on the

Bluetooth connection.