IBM 3274 User Manual page 63

organization for instructions or refer to the appropriate user's
program guide. The following procedure is a typical operating
procedure for an IBM 3872 Modem that has an Auto Answer
feature.
1.
The Ready (
II )
symbol should be displayed in the display
station operator information area, indicating that the 3274
is ready.
2. Set the Mode Select switch on the 3872 modem to the
EXTERNAL position. Set the Data/Talk switch on the
3872 modem to the Talk position. If necessary, set the
3274's Pri/Sec (Primary/Secondary) Line Speed switch to
the appropriate position.
3. Pick up the telephone handset, pull up the exclusion key,
and dial the host system's telephone number. If the host
system is equipped with an Auto Answer feature, you
should hear the answer tone; if it is not equipped with an
Auto Answer feature, the host system operator should
answer the call, verify when the host system is ready for
data transmission, and set the host system's modem to data
mode. In either case, you set the Data/Talk switch on the
3872 modem to the Data position and then hang up the
telephone handset. The Ready light on the 3872 modem
should turn on.
4. If your application requires that you perform a logon
procedure before you can enter data, do so.
5. Key in the message data, and press the ENTER key or the
PF key specified for your application.
6. Note the formatted display or host system response on your
screen. If required, press RESET and continue keying
message data and pressing the ENTER or PF key until you
have finished your message.
7. When the data transmission is finished, disconnect the
telephone line by (1) setting the 3872's Data/Talk switch to
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