Why am I experiencing a delay when sending messages?

After the LM048 connects to a remote device, the local host observes a delay (milliseconds) when receiving messages from the LM048 at particular data rates.

While the LM048 is connected to the remote device it enters into “Online-data-mode”. In “Online-data-mode”, if “AT+ESC+” setting is present the LM048 keeps on checking for an escape sequence from the local host. After receiving the escape sequence the LM048 terminates the “Online-data-mode”, followed by entering the Online-command-mode.

Using the “Online-command-mode”, you can change/query the LM048 settings or can issue the disconnect command to terminate it.

The escape sequence check algorithm may cause a delay in forwarding the messages if some specific timings for the data rate are matched.

If you do not need to initiate the connection-termination from the LM048 or you do not require the Online-command-mode or observed the above issue, then use the “AT+ESC-” setting on your device.
Note 1: The escape sequence checks it is applicable to all Bluetooth v2.0 and v2.1 firmware versions

Note 2: The default setting is “AT+ESC+”.

 

LM048: Remote Configuration via Serial Adapter

This article describes remote configuration of LM048/LM058 Adapter using another Bluetooth Serial Adapter which could be another LM048/LM058 adapter. For Setup procedure please look at the article LM048: Remote Configuration of Serial Adapter via Bluetooth Connection

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LM048: Remote Configuration via USB Adapter or in-Built Bluetooth of PC

This article describes remote configuration of LM048/LM058 Adapter using a Bluetooth USB Adapter or in-built Bluetooth of PC/Laptop. For Setup procedure please look at the article LM048: Remote Configuration of Serial Adapter via Bluetooth Connection

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LM048: Common Issues

Problem 1

I am able to connect to LM048/LM058 Serial Adapter, but no communication is happening?

or

I am able to connect to LM048/LM058 Serial Adapter, but communication data is garbled/garbage/incomprehensible? Read more

LM048: Modem/RS232 Signal Handling

This article explains how LM048/LM058 Serial Adapter handles the RS232 control signals also known as modem signals. This article also covers how to configure your LM048/LM058 Serial Adapter so that the modem signals can be transmitted to the remote end over Bluetooth. Read more

LM048: How to use with Bluetooth USB Adapter

This article explains how to use LM048 with a Bluetooth USB Adapter or in-built Bluetooth Controller of a lapotop/PC running Windows.

The below steps are shown using a Windows 7 Desktop machine with a Bluetooth USB Adapter and Hercules Setup Utility Serial Terminal.

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LM048: How do I pair two LM048s to auto-connect to each other?

A pair of LM048 or LM058 Adapters can be configured to auto-connect to each other when powered up. This procedure is calling Pairing up the adapters. This procedure is ideal when a pair of adapters are used as a serial cable replacement solution. For example a serial cable connection between a POS terminal and label printer can be replaced by a couple of LM048 Adapters paired with each other. Read more

LM048: How can I configure my Bluetooth Adapter?

Finding your firmware number

lm048_fw_locationFirst of all, you will need your Firmware Number, which you can find on the label on the back of your product, as pictured here.

This Firmware Number will identify which configuration software you need to use to configure the device.

Fw: v6.5 or higher requires LM149 Configuration Tool

Fw: v4.22 or lower requires LM049 Configuration Tool

 

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LM048: Remote Configuration of Serial Adapter via Bluetooth Connection

Introduction

This document explains the procedure to configure LM Technologies Bluetooth Serial Adapters – LM048 and LM058, remotely via Bluetooth. Please note the adapter should be programmed with v6.54.MT firmware for this feature to work. This feature is not supported in the standard v6.54 firmware. Read more