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S Registers
Page 203
S Registers
Introduction
Your modem contains a number of registers — memory stores — which define the modem’s
operating characteristics. These registers are called Special Registers or S Registers.
This section of the Global Carrier 56 User Guide shows you the function and usage of each S
Register, how to check the current contents of your S Registers, how to change S Register
settings and how to save the settings in non-volatile memory.
Reading and Changing S Registers
The Read Register command (Sn?) enables you to check the current contents of an S Register.
For example:
To check how long the modem will wait for a dial tone before starting to dial, you would check S
Register 6. To do this:
• Type: ATS6? <E>
The modem will display the current contents of the S6 Register.
If you want to change the register setting, use the Set Register command (Sn=x).
For example:
To change the setting of your modem, so the modem waits five seconds for a dial tone before
starting to dial:
• Type: ATS6=5 <E>
S Register Settings and Modem Memory
Your modem comes configured with a set of default values for each of the special registers. Any
changes you make using the Sn=x command will only last while the modem is switched on.
Once you switch the modem off, these changes will be lost and the next time the modem is
switched on, the factory-set default values will be in effect.
To understand this, consider the following. Modems use three different types of memory chips:
1 RAM chips that only hold information in their memory while the modem has power
supplied to it. You can easily change information in RAM. This memory is used to
temporarily store any changes you make to Commands or S Registers during a
communications session.