Alpha Technologies CFR 3000, CFR 3000RM - Manual (Page 59)

53 4 Communication
3 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.
TIP: Do not include the auto answer command in the initalization string. The CFR
sends an AT command to control the auto answer mode (either “ATS0=1” or
“ATS0=0”).
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)