SF100-G Multi-Tech Systems, SF100-G Datasheet - Page 21

• Manufacturer Part Number: SF100-G
• Description: INTELLIGENT SMS SERVER 8PORT
• Manufacturer: Multi-Tech Systems
• Series: MultiModem® iSMSr
• Type: SMS Serverr

Specifications of SF100-G

• Features: API Commands for Text Messaging
• Size: 6.40" L x 6.00" W x 1.20" H (162.6mm x 152.4mm x 30.5mm)
• For Use With/related Products: Data Transfer Through Cellular GSM Network
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 881-1126

Multi-Tech Systems, Inc.
Signal Strength
Using AT Commands to Check Network Registration and
Roaming Status
Use this command to verify that the cellular modem has been registered on a wireless network.
Signal Strength Command
To View Strength
For the SF 400/800 models without signal LEDs, signal strength can be determined by using the
following AT command: AT+CSQ. This command is the default setting on the Network Setup > Cellular
Modem screen. This works for the SF 100 as well.
AT Command Response Example
+CSQ: xx (For xx, see the values chart below)
Signal Strength Reference Table
The following table lists the meaning of the xx values in the signal strength response and explains how
they correspond to the number of LEDs lit for signal strength.
SF 100 Signal Strength LEDs
1.
2.
In the command window, type AT+CREG?
The modem will respond in one of the following ways:
Note:
problem is the strength of the received signal.
AT+CSQ Values
0 to 6
7 to 14
15 to 23
24 to 31
99
Value
+CREG: 0,0
+CREG: 0,1
+CREG: 0,5
If the modem indicates that it is not registered, verify the signal strength to determine if the
Network Registration Status
The modem is not registered on any network
The modem is registered on the home network
The modem is registered on a network and it is roaming
MultiModem® iSMS User Guide for Administrators
Network Registration Verification
Signal not detectable
Very weak signal
Strongest signal
Signal Strength
Stronger signal
Weak signal
SF 100 Signal LED Bars
No LEDs lit
1 Bar LED is lit
1 Bar and 2 Bar LEDs are lit
1 Bar, 2 Bar, 3 Bar LEDs are lit
No LEDs lit
Chapter 2 – Getting Started
21