WaveWare SPS-5 v9E - Manual (Page 29)

SYSTEM IDENTIFICATION COMMAND
The System Identification command allows installation programs and other software applications to poll serial ports and
network connections for the existence of a WaveWare v9E Paging Encoder using the Standard ATI Command. This can
be used for a supervised process (also called keep-alive) where the host system periodically polls the paging system for a
response. When the WaveWare paging transmitter recognizes a command formatted as ATI, the transmitter
responds with the following message:
WaveWare Paging Encoder v9.17
(The firmware version number is subject to change)
PAGING SESSION LOGIN
The v 9 Paging Session Login mode allows a Host Device, sometimes called a Remote Entry Device, to initiate
communications with the paging system. With the WaveWare v9E Paging Systems, the Login process is optional. The
WaveWare v9E Paging System will automatically login a Host Device and process the paging message if it recognizes a
properly formatted TAP message block at any point in its operation.
The Host Device initiates the Login process by transmitting a carriage return character every two seconds until the
paging system properly responds or until the Host Device times out and notifies the operator of a bad connection. The
paging system will respond with “ID=” (Note: the quotation characters are used here only for reference and are not
included in the transactions). The “ID=” will not be repeated or timed out by the paging system.
The Host Device should respond to the paging system with:
PG1 or pg1
The WaveWare v9E Paging System will then respond with:
110 1.8WaveWare Paging Encoder v9.00
The “110 1.8” message indicates that the system conforms to TAP specification version 1.8 and should be backward
compatible with earlier TAP implementations. The paging system then notifies the Host Device that it is ready to accept
messages as follows:
[p
This completes the Login process.
PAGING OPERATION
Paging transactions are transmitted in blocks of characters, where one transaction is sent per block. Each block sent by
the Host Device is acknowledged by the paging system. The Host Device must wait for this acknowledgement before
sending the next block. The WaveWare v9E Paging System provides acknowledgement in the form of an
character.
The WaveWare v9E Paging System supports TAP message blocks up to 253 characters in length, with a 235 to 244
character message, from 1 to 10 characters for ID (pager number), plus 5 control characters, and a 3 character
checksum. (Message field length is restricted as follows: when a 1 character ID is used, a 244 character message can be
accommodated, and so on, for a total of 253 characters, such that when a 4 character ID is used, a 241 character
message can be accommodated. The maximum ID field length of 10 causes a maximum message field length of 235
characters). A block always carries two fields with their associated carriage returns. The message field may be empty,
but its carriage return must be included in the data block. The TAP message block format is as follows: