Status bit message - RSI51

RSI51 Installation Manual

Document code
English (United States)
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>