COURIER HIGH SPEED MODEMS
Recommended Settings
When the connection is made and the data rate is determined, host/modem rates may change dramatically to match the connection rate (when in online synchronous mode, the modem is transparent on the line). To avoid this dramatic rate switching (which can be hard on some computers), we recommend that the modem be set with a fixed rate between the computer or terminal and modem (%Nn) and that the connection rate (&Nn) be set to the same rate.
Result Codes (Xn)
The Courier displays normal or extended synchronous result codes, depending on the setting of the Xn command. By default, the modem is set to X1 for extended result codes. To change to normal result codes, set the modem to X0.
The normal result codes return messages such as VAL or INV (VALID or INVALID), whereas the extended codes offer explanations⎯INVPS (INVALID Parameter Syntax Error).
Automatic Answering (S0=1)
When the Courier is operating in V.25 bis mode, it ignores the DIP switch 5 setting, which controls Auto Answer. To set the modem to automatically answer incoming calls, set the modem to S0=1, so it answers on the first ring. You can substitute a higher value. See the
Suppressing Auto Answer
To disable Auto Answer, set the modem to answer on zero rings, S0=0.
Choosing a Synchronous Protocol (&Mn)
Once the &Xn, %Nn, &Nn, Xn, and S0 commands are configured, you must use the &Mn command to choose the HDLC or
&M6 Use the
