SECTION 5 - DATA COMMUNICATIONS PROTOCOL
The data transfer protocol used by the Model 16 makes it possible for
buffered data entry devices and simple computer programs to quickly and
reliably transfer paging information. The two variations of the protocol
are very similar in structure and handshaking but allow different paging
modes.
The internal database mode references the 1000-User directory within the
Model 16. The User directory stores full pager capcodes, functions, and
operating flags that allow User validation, priority paging, and other
options.
The full capcode mode allows paging of any addressable pager but no paging
attributes can be stored to or referenced from the User Database.
CONNECTION
For clarity of discussion, the Model 16 will be referred to as the Paging
Terminal and any device, computer, or buffered data entry station that is
used to communicate with the Model 16 will be called an Entry Device.
LOGON SEQUENCE
The Logon sequence is repeated each time the Paging Terminal answers a new
call after having been previously in a waiting state. The Logon sequence
establishes the data transfer mode. The data transfer mode does not change
unless the Entry Device terminates the conversation, Disconnects, and
Connects again.
In the descriptions to follow, quotation marks are not transmitted and
brackets are used to denote a control character. The < optional > message
sequences may be enabled or disabled by programming (see "Section 4A -
System Programming" - Paging Options). The <CR> following the < optional >
message is omitted if the message sequence is disabled.
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N O T E
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<CR> represents carriage return. It also includes the programmed number of
trailing nulls. If a <LF> (line feed) follows the <CR>, then the nulls will
follow after the <LF>. A typical <CR> (in hex) would be:
OD
OC
00 00 00 00 00 00 00
L-nulls
■— Iine feed
— carriage return
Sending nulls after <CR> is usually only associated with older terminal
equipment. Therefore, it is recommended that you leave the setting for the
number of trailing nulls at the default value of 0.
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