Section 3: Technical Information; Calling Pagers - scope Connexions CX9DC Installation & User Manual

Radio paging transcoder dc, two port version

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ConneXions CX9DC DC power, Two Port Version

This section provides a more in depth understanding of how messages are formatted for serial

communication from a host. It need only be studied by those intending to write their own serial

comm.'s software.

Calling Pagers

Pagers all use 7 digit numeric addresses which enables the system to support thousands of pagers

without identity clashes. Most pagers will support multiple addresses (sometimes referred to as CAP

codes, RIC's or identities). This enables the pager not only to respond to its own unique address but

also to respond to group or global addresses.

These real 7 digit numeric codes are often substituted for shorter logical numbers which are easier to

remember. Under these conditions the host or speciality program within the transcoder will perform an

algorithm on the data string received to convert the simpler logical number back into a real 7 digit

number for transmission.

For improved data recovery without error the real 7 digit pager numbers are always spaced 8 digits

apart.

To avoid system identity clashes, transcoders are provided with a base number within the range of

1000 to 1,999,000. If for example a base address of 0100,000 is applied to a transcoder, the first real

pager number will 0100,008 followed by 0100,016 and so on.

Logical pager numbers are normally used on systems fitted with the telephone interface and those

which are interfaced to personal computers. The algorithm would perform the following function:-

For example take the logical pager number of 123

The logical pager number 123 will be multiplied by 8 and then added to the base number to provide

the 7 digit real number

Logical No

123

Pager address 1 is normally reserved as the personal identity for that specific pager. Other

addresses, of which there can be 6 or more, can be tagged to specific pagers to form selected

groups. Address 2 could, for example, be used for all pagers to formulate a global call.

Address codes can be divided between full addresses and sub addresses. Full addresses can allow

four different bleep types, A, B, C or D, whereas sub-addresses will only accommodate a fixed bleep

type. A status line of information will normally be provided on the pager screen which will highlight the

type of bleep sent together with other status information.

Numeric Pagers

Example serial message string:-

N0012300A1234567890<CR>

The 'N' informs the transcoder that this message is destined for a Numeric pager. Any data not

preceded by this will be ignored.

CX9DC