Как получить доступ к AT-командам из PHP в Rasspberry Pi3?

Я пытался из Raspberry Pi3 использовать команду minicom, и она работает.
SIM-модуль — SIM7600CE.
Просто не смог выполнить эту команду из PHP.

<?php
include '../src/PhpSerial.php';

$serial = new PhpSerial;

$serial->deviceSet("/dev/ttyUSB2");

$serial->confBaudRate(115200);
$serial->confParity("none");
$serial->confCharacterLength(8);
$serial->confStopBits(1);
$serial->confFlowControl("none");

$serial->deviceOpen();

$serial->sendMessage('AT+CMGF=1');
$serial->sendMessage(chr(13));
$serial->sendMessage('AT+CMGS="09xxxxxxxx"');
$serial->sendMessage(chr(13));
$serial->sendMessage("THIS IS  TEST");
$serial->sendMessage(chr(26));

sleep(6);

$read = $serial->readPort();
echo $read;
$serial->deviceClose();

Код вернет очень странные слова

AT+CMGF=1AT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+
CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+
CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT+CAT ERROR AT+CMGS="09xxxxxxxx"AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09 AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09
AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09
AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09
AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT+CMGS="09AT
+CMGS"09AT+CMGS"09AT+CMGS"09AT+CMGS"09AT+CMGS"09AT+CMGS"09AT+CMGS"09AT+CMGS"09AT
+CMGS"09AT+CMGS09AT+CMGS09AT+CMGS09AT+CMGS09 ERROR AT+CMGS09 ERROR AT+09
ERROR

если я отправлю

$serial->sendMessage("AT+CPSI?" . chr(13));

результат получит некоторую информацию, и все же получил очень странные слова

AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK
AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT
OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK
AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK
AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT OK AT+CPSI? +CPSI:
LTE,Online,466-01,0xC185,130679308,485,EUTRAN-
BAND3,1550,5,5,-77,-1035,-759,13 OK AT OK AT+CPSI? +CPSI: LTE,Online,466-
01,0xC185,130679308,485,EUTRAN-BAND3,1550,5,5,-77,-1035,-759,13 OK AT+CPSI?
+CPSI: LTE,Online,466-01,0xC185,130679308,485,EUTRAN-
BAND3,1550,5,5,-77,-1035,-759,13 OK AT+CPSI? +CPSI: LTE,Online,466-
01,0xC185,130679308,485,EUTRAN-BAND3,1550,5,5,-77,-1035,-759,13 OK

Кто может мне помочь?

Я пробовал это в течение 1 месяца.