Migrating from FireFly to GRIDBluFly? Try these settings

Migrating from FireFly to GRIDBluFly? Try these settings

If you are replacing a FireFly device with a GRIDBluFly and experiencing Bluetooth pairing issues, the problem is likely related to authentication settings. The GRIDBluFly ships with a different default authentication mode than the FireFly. Some devices, such as Zebra scanners, expect a PIN code request during pairing. This guide walks you through the commands needed to match the FireFly behavior.

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Before you start

You will need a terminal emulator (Tera Term recommended) connected to the GRIDBluFly via serial or Bluetooth. If you are not sure how to enter command mode, refer to the GRIDBluFly Setup Guide for Serial Bluetooth Communication before continuing.

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1. Enter command mode

Type exactly, without pressing Enter:

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The device responds with CMD and the Status LED blinks rapidly.

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2. Set authentication to PIN code mode

This changes the GRIDBluFly authentication so it requests PIN code 1234 during pairing, matching the behavior of the older FireFly device.

SA,4

Expected response: AOK

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3. Set Bluetooth to Classic mode only

This disables BLE and forces the GRIDBluFly to use Bluetooth Classic (SPP profile only), which is the same profile used by the FireFly.

SG,2

Expected response: AOK

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4. Verify the settings

Use the following commands to confirm the changes were applied correctly.

Command	What it returns
GA	Current authentication setting. Should return 4
GG	Current Bluetooth mode. Should return 2
V	Current firmware version

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5. Reboot to apply

R,1

The device will reboot with the new settings applied.

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6. Retry pairing

1. Remove the GRIDBluFly from your PC's Bluetooth devices list if it was previously paired.
2. Power cycle the GRIDBluFly.
3. Pair again from Windows. This time the device should request PIN 1234.
4. If pairing succeeds, test communication using a terminal emulator.

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Command reference

Command	Action	Value used
SA,4	Set authentication to legacy PIN code mode	4 = PIN code required
SG,2	Set Bluetooth interface to Classic SPP only	2 = BT Classic only
GA	Get current authentication setting
GG	Get current Bluetooth mode
V	Get firmware version
R,1	Reboot and apply changes

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Important notes

• These settings are based on known cases where Zebra scanners and similar devices required PIN code authentication to complete pairing with the GRIDBluFly.
• SA,4 enables legacy PIN code mode for Classic Bluetooth only. It does not affect BLE pairing.
• For full setup instructions, see the GRIDBluFly Setup Guide for Serial Bluetooth Communication.