JTECH Communications Inc. SERVALERT200 Manuel D’Utilisation

 

 
1. Preamble 
Preamble is a string of three hex characters used to provide “padding” between 
messages in an output buffer as well as information to the SmartAlert transmitter 
that a paging message is on its way. The Preamble is Chr$(255) & Chr$(255) & 
Chr$(255)  
 
2.  Function Bit  
The function bit is actually a byte and is a single hex character, which follows 
immediately after the preamble. This character signifies to the SmartAlert 
transmitter which function bit to “Turn On” in the POCSAG message that is sent. 
The selection of function bits in the transmitted message allows the application 
developer to exploit various functions, which reside inside the pager. Function 
bits in the transmitted message by themselves do not evoke functions from the 
pager, rather they must match functions which are pre-programmed into the 
pager before they cause a pager to operate in a particular fashion. For our 
purposes here, one of four hex characters are available to select function bits in 
the transmitted message. Hex 01 to hex 04 are the acceptable characters. The 
following table shows, which function bits, evoke what pager reactions. 
 
Function Bit  
(Only One May Be Set) 

Function accessed from Pager 

Function Bit #1 Enabled 

Non Priority Alert for Numeric Only Pagers 

Function Bit #2 Enabled 

Priority Alert for Numeric Only Pagers 

Function Bit #3 Enabled 

Non Priority Alert for Alphanumeric Pagers 

Function Bit #4 Enabled 

Priority Alert for Alphanumeric Pagers 

 
3. Cap Code 
Cap Code for 7-digit extended Message Format 
In the seven-digit extended format no assumptions or cross-references are made 
and the seven-digit pager cap code sent is the actual seven-digit pager cap code 
received by the pager.  Application developers will find the seven digit extended 
format provides maximum flexibility. 
 
Important note: If the cap code prefix of 000 is used, the SmartAlert transmitter 
recognizes this as the JTECH “times 8” (X8) cap code scheme. The transmitter 
multiplies the ‘cap code’ number provided by 8 prior to transmission to the pager.    
For example, the JTECH pager may have two labels.  One will be the ‘pager ID’ 
number the other will be the cap code number. The pager ID number will be the 
cap code divided by 8.  With the times 8 scheme, be sure to use the pager ID 
number in your program.  All other cap codes using valid prefixes will be sent as 
entered into the program.