FLEX Overview

FLEX Message Word Definitions

where “A” = single-phase device, “E” = any-phase device, and “I” = allphase device.

•If the unit were to be a two address unit where both addresses are individual addresses, then “A”, “E”, or “I” would again preface the address field of the first address. “B”, “F”, or “J” would preface the second address. The “B”, “F”, or “J” indicates that the address is a second address and it is to have the properties of the first address. This rule eliminates the need for an administrative operator or a salesperson to calculate a starting address, which would allow standard rules to always apply.

•In other cases, especially where a group address is to be included, it is very likely that the “U” through “Z” forms of the CAPCODE will be used so that the frame can be explicitly chosen to provide best battery life, and the required “same phase” operation can be met in the case of the singlephase units.

CAPCODE TO BINARY CONVERSION

Short CAPCODE

To convert a short address CAPCODE, the number 32,768 is added to the 7- digit decimal CAPCODE address (or to any CAPCODE less than 2,031,615). The resultant number is then converted to a 21-bit binary number, which then becomes the information bits of the (31,21) BCH code word transmitted over the air.

Long CAPCODE 2,101,249 to 1,075,843,072

Long address set 1–2 is in this range. To convert a long address CAPCODE, the number 2,068,481 is subtracted from the CAPCODE address. The resultant number is then divided by 32,768 with the remainder, incremented by 1, being the 1st word of the long address. This is the same as calculating the ((CAPCODE – 2,068,481) modulo 32768) + 1. This value is converted to a 21-bit binary number, which becomes the information bits in the (31,21) BCH code word transmitted over the air as the 1st address word.

The second word of the long address is determined by first calculating the integer portion of the (CAPCODE – 2,068,481) divided by 32,768. This value is then subtracted from 2,097,151 (equivalent to the ones complement of the value in binary), and converted to a 21-bit binary number, which becomes the information bits in the (31, 21) BCH code word transmitted over the air as the second address word.

Long CAPCODE 1,075,843,073 to 3,223,326,720

Long address sets 1–3 and 1–4 are in this range. The 1st word of the long address is calculated following the same rules for the long addresses set 1–2. The second long address word is determined by subtracting 2,068,481 from the CAPCODE, the resultant number is divided by 32,768 with the integer portion added to