SF100-G Multi-Tech Systems, SF100-G Datasheet - Page 21
SF100-G
Manufacturer Part Number
SF100-G
Description
INTELLIGENT SMS SERVER 8PORT
Manufacturer
Multi-Tech Systems
Series
MultiModem® iSMSr
Type
SMS Serverr
Datasheets
1.SF100-G.pdf
(118 pages)
2.SF100-G.pdf
(4 pages)
3.SF100-G.pdf
(2 pages)
4.SF100-G.pdf
(16 pages)
5.SF100-G.pdf
(2 pages)
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
- SF100-G PDF datasheet
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- SF100-G PDF datasheet #3
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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
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