Status bit message - RSI51

RSI51 Installation Manual

Document code
M211863EN
Revision
B
Language
English (United States)
Product
RSI51
Document type
User guide

Status bit message monitors the operation of RSI51 by observing the status of the runway light intensity and runway-in-use values. The message performs a bit logic operation which gives either 0 or 1, where 1 represents alarm active.

Status bit message format

<SOH><SID>ST2<STX>xyzabcdefghijklmnopqrs <CRC16 %04d><ETX><CR><LF>
Name Description
<SOH><SID>ST2<STX> Message header, where <SID> identifies individual RSI51 units. For example, 1A.
x y z a b c d e f g h i j k l m n o p q r s

Message data:

  • x = 1 if two or more runway light intensity values are active at the same time
  • y = 1 if none of the runway light intensity values are active
  • z = 1 if both runway-in-use values are active
  • a = 1 if none of the runway-in-use values are active
  • b … s = Not in use. Fixed to 0.
<CRC16 %04d>

Message checksum:

  • Initial value = FFFF
  • Invert result bits = Yes
  • Format = Hex
  • Polynomial = 0x1021
  • Bit reverse CRC used = No
<ETX><CR><LF> Message trailer

Status bit message characteristics

Property Value
Default send interval 60 s
Polling command STATBITREP

Example of status bit message

<SOH>1AST2<STX>0000000000000000000000 7F83<ETX><CR><LF><EOT>