User's Manual

84
Modem 34336
5.1.3 R ESULT C ODES
Result codes (see Table 5-2) are messages sent by the modem to the DTE
monitor in response to your commands. Result code options are selected
using the V and X commands, as explained below.
Result codes may be words (V1 command) or digits (V0). Word codes are
preceded and followed by a carriage-return, line-feed sequence. Digit codes
are followed by a carriage return. The result codes and their meanings are
summarized below:
Result codes 0-4 comprise the basic result code set: OK, CONNECT, RING,
NO CARRIER, and ERROR. Codes 5-43 provide additional response
information, as explained in Table 5-2. Various combinations of these codes
can be enabled or disabled by using the X command and its four parameters.
5.1.4 T RANSMISSION S PEED
Transmission speed is governed by the speed of the system with which you
wish to communicate. You must set the transmission speed of your computer
by setting a switch in the hardware or by issuing a software command. (Refer
to your computer documentation.) When the Modem originates a call, it
automatically detects and adjusts to the transmission speed set when the
communication port was initialized.
When answering a call, the Modem determines the transmission speed from
the carrier signal of the originating modem. Change the setting of your
equipment to match that of the remote system. Other-wise, unintelligible
data appears on your screen. (Depending on the parameter used with the
X command, the speed is indicated by the CONNECT response code.)
When a call is originated in Hayes mode, the AT attention code causes the
Modem to autobaud and override any front-panel Speed Limit or DTE Speed
settings. The speed at which the Modem autobauds defines the speed limit for
subsequent connections. If the unit is not autobauded, the default interface
rate is 38,400 bps.
5.2 Hayes Compatible Commands
All Hayes compatible commands that are used with the Modem are listed
in Table 5-1 (near the end of the chapter). More detailed information is
provided below for selected Hayes commands—particularly those used to
answer and originate calls, and other commonly used commands. For Hayes
commands that control modem options, additional information on options
may be found in Chapter 3. Commands are listed in alphabetical order in
this section and in Table 5-1.