Alpha Technologies CFR 3000, CFR 3000RM User Manual
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4
Communication
The initialization string (Item #527) is a set of commands the CFR sends to the
modem to initialize it. For a US Robotics modem, the string is:
•
ATX4Q0V1&H0&R1&I0&B1
Where:
• X4: Extended set of result codes.
• Q0: Result codes are displayed.
• V1: Display verbal (words not numbers) result codes.
• &H0: Disable transmit data flow control (neither hardware “CTS” nor software
“Xon/Xoff” flow control).
• &R1: Disable hardware receive data flow control (set modem to ignore RTS
and send data all the time).
• &I0: Disable software data flow control (no “Xon/Xoff” flow control).
• &B1: Set the RS–232 serial port rate to fixed (set modem to detect the AT
command baud rate and maintain it).
The first three commands are supported by all Hayes-compatible modems. The last four
are supported by US Robotics and some other manufacturers.
For modems that do not support the extended Hayes commands, you should create an
equivalent command. In most cases the simplified string:
•
ATQ0V1
works well.
4.7 Installing and Using the External Modem (Continued)