Справочник Пользователя для SIGFOX SA SNT900ST

SNT

User Guide

Ref.

Rev. 0.1

Date : 12/03/2016

0.1

Page 4 of 7

III. SNT manual operation

SNT have two operation mode : standalone mode and serial communication.

1. Standalone mode

Pressing the button for a few seconds will activate the device. Then the device will execute the

sequence described below. SNT have two mains option : uplink only and bidirectional sequences.

These mode can be set by AT commands (see after)

By default, this sequence is looped 10 times, and device shuts down automatically.

Uplink sequence

Just after power up, SNT send a SIGFOX frame every 10 minutes by default. This option can be

set by AT commands. This frame contains GPS informations if available.

When SNT is sending, green led blinding.

Between two sent, SNT led can be of one of these two colours :

 Green if internal GPS is fixed

 Orange in other case

Bidirectional sequence

This sequence is :

1. TX :

device sending an uplink message.

2. IDLE :

device in waitstate (20 seconds)

3. RX :

device in receive mode (timeout after 25 seconds)

Depending on the reception result, there are two possible branches :

> branch 1: sequence completion by successful downlink frame reception

4. Led blinding in green ,indicating successful message reception and send an OOB message

5. Link quality indication is displayed for 10sec (details below)

> branch 2: sequence completion by 25 sec timeout (NO frame received)

4. LED blinking in red at the same time 3 times (~6seconds)

Link quality indication :

Provided the Backend direct callback is used and includes uplink RSSI (*), the link quality is flashed

using a LED code (sequence step 4)

 LINK QUALITY = VERY GOOD

→ Blinks 3 times (WHITE)

 LINK QUALITY = GOOD

→ Blinks 2 times (WHITE)

 LINK QUALITY = AVERAGE → Blinks 1 times (WHITE)

 LINK QUALITY = LIMIT

→ Blinks 3 times (

RED

)