AX−SIP−SFEU, AX−SIP−SFEU−API

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11

Standby

After Power−Up and after finishing a Sigfox

transmission, AX−SIP−SFEU enters Standby mode. In

Standby mode, AX−SIP−SFEU listens on the UART for

commands from the host. Also, OOB frames are transmitted

whenever the OOB timer fires. To conserve power, the

AX−SIP−SFEU can be put into Sleep or turned off (Deep

Sleep) completely.

Sleep

The command AT$P=1 is used to put the AX−SIP−SFEU

into Sleep mode. In this mode, only the wakeup timer for

out−of−band messages is still running. To wake the

AX−SIP−SFEU up from Sleep mode toggle the serial

UARTRX pin, e.g. by sending a break (break is an RS232

framing violation, i.e. at least 10 bit durations low). When

an Out of Band (OOB) message is due, AX−SIP−SFEU

automatically wakes up to transmit the message, and then

returns to Sleep mode.

Deep Sleep

In Deep Sleep mode, the AX−SIP−SFEU is completely

turned off and only draws negligible leakage current.

Deep Sleep mode can be activated with AT$P=2. To

wake−up from Deep Sleep mode, GPIO9 is pulled to GND.

When using Deep Sleep mode, keep two things in mind:

Everything is turned off, timers are not running at all and all

settings will be lost (use AT$WR to save settings to flash

before entering Deep Sleep mode). Out−of−band messages

will therefore not be sent. The pins states are frozen in Deep

Sleep mode. The user must ensure that this will not result in

condition which would draw a lot of current.

AT Commands

Numerical Syntax

hexdigit ::= [0−9A−Fa−f]

Hexnum ::= “0x” hexdigit+

decnum ::= “0” | [1−9] [0−9]*

octnum ::= “0” [0−7]+

binnum ::= “0b” [01]+

bit ::= [01]

optnum ::= “−1”

Frame ::= (hexdigit hexdigit)+

uint ::= hexnum | decnum | octnum | binnum

uint_opt

::= uint | optnum

Command Syntax

A command starts with ‘AT’ (everything is case

sensitive!), continues with the actual command followed by

parameters (if any) and ends with any kind of whitespace

(space, tab, newline etc.)

If incorrect syntax is detected (“parsing error”) all input

is ignored up until the next whitespace character.

Also note that any number can be entered in any format

(Hexadecimal, Decimal, Octal and binary) by adding the

corresponding prefix (‘0x’, ‘0’, ‘0b’). The only exception is

the ‘Send Frame’ command (AT$SF) which expects a list of

hexadecimal digits without any prefix.

Return Codes

A successful command execution is indicated by sending

‘OK’. If a command returns a value (e.g. by querying

a register) only the value is returned.

Examples

Bold text is sent to AX−SIP−SFEU.

AT$I=0

AX−SF 1.1−RC1

Here, we execute command ‘I’ to query some general

information.

AT$SF=aabb1234

OK

This sends a Sigfox frame containing {0xAA : 0xBB : 0x12

: 0x34} without waiting for a response telegram.

AT$SF=0011223344,1

OK

RX=AA BB CC DD

This sends a Sigfox frame containing {0x00 : 0x11 : 0x22 :

0x33 : 0x44}, then waits for a downlink response telegram,

which in this example contains {0xAA : 0xBB : 0xCC :

0xDD}.

AT$CB=0xAA,1

OK

The ‘CB’ command sends out a continuous pattern of bits,

in this case 0xAA = 0b10101010.

AT$P=1

OK

This transitions the device into sleep mode. Out−of−band

transmissions will still be triggered. The UART is powered

down. The device can be woken up by a low level on the

UART signal, i.e. by sending break.