USRobotics V.34 - Manual (Page 172)

COURIER HIGH SPEED MODEMS
Synchronous Operations F-7
The Courier and the remote modem must use the same
eight-bit data format. The character length must be 7
bits and either ODD or EVEN parity (ODD is preferred),
or 8 bits and NO parity.
&M7 Use the High Level Data Link Control (HDLC), an
ITU-T standard for synchronous communications.
HDLC ignores parity.
V.25 bis Commands and Result Codes
Commands
• CIC (Connect incoming call)
Instructs the modem to answer an incoming call.
• CRN (Call request using number provided )
Instructs the modem to dial the number following this
command.
Example:
CRN18001234
• CRS (Call Request with memory location)
Instructs the modem to dial a number stored in
memory.
Example:
CRS3
• DIC (Disregard incoming call)
Instructs the modem to disregard an incoming call

overrides auto answer for this call.
• PRN n (Program number)
Stores a number in NVRAM.
Example:
PRN3; 18001234
• RFN (Request list of forbidden numbers)
Instructs the modem to list the numbers with which the
modem is unable to connect.
• RLN (Request list of stored numbers)
Instructs the modem to list those numbers previously
stored in NVRAM.