US Robotics USR3500 Guide d'installation télécharger pdf (Page 29)

Rev 1.1 9/22/14 29

Getting Started

Communicating with the

USR3500

Table 7. Basic AT Commands to Use with the USR3500

AT Command

Description

AT+CGMI

To check if the serial port is OK

The USR3500 will respond with "Sierra Wireless" when it is OK.

AT+CPIN=xxxx

To enter a PIN code, xxxx (if activated)

AT+CSQ

To verify the received signal strength

AT+CREG?

To verify the registration of the USR3500 on the network

6.2. Verifying the Received Signal Strength

The USR3500 only establishes a call if the received signal strength is strong enough.

Using a communication software such as HyperTerminal, enter AT+CSQ to check the

received signal strength. The response returned will follow the format +CSQ: <rssi>,

<ber>

where: <rssi> = received signal strength indication, and <ber> = channel bit

error rate.

Refer to the table below for the description of the <rssi> values returned.

Table 8. <rssi> Value Description

<rssi> Value

Description

0 – 10

Received signal strength is insufficient

11 – 31

Received signal strength is sufficient

32 – 98

Not defined

No measure available

6.3. Verifying the Network Registration

Using a communication software such as HyperTerminal, enter AT+CREG? to verify the

network registration of the USR3500. Refer to the table below for the list of main

responses returned.

Table 9. AT+CREG? Main Reponses

AT+CREG? Response

Description

AT+CREG: 0, 0

Not registered

AT+CREG: 0, 1

Registered on the home network

AT+CREG: 0, 5

Registered on a roaming network

If the USR3500 is not registered on the network, do the following:

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 50 51

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US Robotics USR3500 Guide d'installation Page 29

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