Working with Memory

This section contains information about:

• Saving a phone number to NVRAM (Non-volatile Memory)
• Working with Flash Memory

You can upgrade the software held in Flash memory by performing a software download. Refer to the Upgrading your Modem section of this guide for more information about performing a software download.

Overview

Courier 56K Business Modems contain three types of memory that you can interact with: random access memory (RAM), nonvolatile random access memory (NVRAM), and Flash memory.

Example: Sending ATI5 will display NVRAM settings on your screen.

Note: To see a complete listing of the permanent settings stored in Flash memory refer to the Flow Control Template.

Working with RAM and NVRAM

You can change any setting just for the current session. For example, setting your Courier 56K Business Modem to AT&N8 will only allow a connection to a remote devices at a rate of 14400 bps or lower until the modem is reset. Once the modem is reset, the default variable connection rate will be re-established.

If you want the new setting to be a default, write it to NVRAM at the same time. From the example above, you would send AT&N8&W to the modem. The new default setting for your Courier 56K Business Modem will only allow a 14400 bps connection to a remote device.

Note: To restore NVRAM factory defaults, use the AT&Fn command. Refer to the Alphabetic Command Summary section for more information on setting &Fn.

Saving a Phone Number to NVRAM

CAUTION: Do not include modem commands in AT&Zn=s. Only dial commands and numbers can be stored.

Example: To store the phone number 555 6789 at position 2, type AT&Z2=5556789 . If you want to dial the phone number you saved, type ATDS2 .

If the call requires a special setting, insert it in the command before the DSn command. In this example, &M0 (no error control) comes before DS2 . Type: AT&M0DS2

CAUTION: The AT&Zn=s command functions differently when Dial Security is enabled. Refer to the Dial Security section of this guide for more information.

Displaying S-Register Value Information

Example: Sending ATS0? will allow you to view the contents of Register S0.

Saving a Command String to NVRAM

Once the command is stored, you can program the voice/data switch to send the stored command when pressed. Refer to the S-Registers appendix in this guide for more information about S-Register 32 and assigning voice/data switch functions.

Programming the Voice/Data switch

After storing a command to NVRAM, you can program the voice/data switch to execute the stored command string when pressed. The function of the voice/data switch is determined by the setting of S-Register 32.

1. Open your communications software program.
2. Store a command to NVRAM using the AT&ZC=string command (see the table above).
3. Send ATS32=9 to your modem. This command will set the voice/data switch function to execute the stored command string.
   Note: You can reset the voice/data switch at any time (Refer to the S-Registers appendix in this guide for a complete list of S32 voice/data switch functions). You can also overwrite the stored command string with a new one at any time.
   
4. Now, you can press the voice/data switch whenever you want the stored command string executed.

Example: Issuing AT&ZC=I6 to your modem stores the command string that displays the link diagnostic screen to NVRAM. Then issuing the ATS32=9 command to your modem will allow you to display the link diagnostic screen whenever the voice/data switch is pressed.

Working with Flash Memory

The Courier 56K Business Modem permanently stores three configuration "templates," or prepared sets of commands, in Flash memory. You can use the &Fn command to load one of the three configuration templates from Flash memory into current memory.

Example: Sending AT&F1 to your modem will load the Hardware Flow Control Template into RAM Memory.

DIP switch settings override AT commands at power-on. You can set DIP switch 10 to ON and reset the Courier 56K Business Modem to load the &F0 settings.

All of the settings in each template are given in the Flow Control Template.

For more information about hardware and software flow control, refer to the Flow Control Template.

Saving Flash Templates to NVRAM

To save one of the three flash templates to NVRAM and have it serve as the reset default, enter AT&Fn&W.

DIP switch settings override AT commands at power on. Make sure DIP switch 10 is OFF, or the &F0 template will be loaded.

Default Settings

When the Courier 56K Business Modem is turned on, it loads the settings stored in NVRAM. By default, these settings are the same as the &F1 template.

You can save any of the three templates, or save modified versions of them, in NVRAM for use as power-on defaults.

Refer to the Flow Control Template appendix in this guide for a complete listing of the default values.