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Relaying Pager Messages
When a pager message is to be relayed, the initiating RTU will send the text (plus time and date) and the
pager number indexes to the pager RTU. This means the RTU that initiates the pager message uses its own
pager sequences but not its own pager numbers. The pager numbers configured in the pager RTU (the RTU
that dials the paging service or has the pager radio) are used to target the pager receivers. If the pager
message is not acknowledged after notifying the first group of pager receivers, the initiating RTU will send a
second pager command that targets the second group of pager receivers. To acknowledge the pager
message, a zero is written to the acknowledge bit in the initiating RTU (the acknowledge bit is the bit
configured in the pager message block in ladder logic).
Fails And Successes
After a pager message is sent to a dial-up paging service, an SMS network or to a pager radio, the RTU
does not know if the pager receiver or mobile phone received the pager message (the pager receiver may
have been switched off or was out of range). However, with dial-up paging or an SMS network, the RTU is
able to test whether the service provider received the message OK.
 RTU sends own pager messages: If the dial-up paging service or local GSM accepts the message or a
pager radio is being used, the success counter of RTU 250 is incremented. If the dial-up paging service
does not accept the message, the message is retried every 60 seconds for the maximum number of dial
retries as specified for the PSTN port and then a fail is recorded. If the GSM does not accept the
message (and the Dial Retries of the PSTN port is not zero), after 30 seconds the message is retried.
The RTU will then retry up to 5 times in total waiting 2 minutes between retries. After all retries have
failed, the fail counter for RTU250 is incremented. The fail counter of RTU 250 is also incremented when
a pager message is not acknowledged (please see the Pager Message ladder block for details).
 RTU relays own pager messages: In this case, the pager message is passed on to another RTU (the
pager RTU). If the pager RTU accepts the message, the success counter for RTU 250 in the local RTU
will be incremented. The fail counter of RTU 250 is incremented when a pager message is not
acknowledged.
 Pager RTU sends pager messages from other RTUs: this is the same as when an RTU sends its own
pager messages except the RTU does not require the pager messages to be acknowledged.
Generating A Pager Message
Please see the topic Example - SMS Pager Messages.
Toolbox 32 User Manual
http://helpdesk.servelec-semaphore.com/
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