Section 6
SUPERVISOR PROTOCOL
24
6.5 MESSAGE FORMAT
Messages are RS-485 half-duplex, 9600 baud, 8 bit, 1 stop bit, no parity. Control characters
are used to frame a message. These characters mark the start of the message and the end
of the message. All messages have the following format:
STX
- Start of text. Signifies the start of a message. (0x02)
##
- Two character com number
m
- one character message type
d
- data, one to several characters long. Multiple items are separated by commas.
xx
- two character checksum, based on all characters after STX
CR
- Carriage Return. CR-LF signifies end of a message. (0x13)
LF
- Line Feed. CR-LF signifies end of a message. (0x10)
In the examples shown in the following section, STX, CR, and LF are not shown.
6.6 MESSAGE TYPES
Messages follow the forms listed below. Details of the data within the messages are listed
in the DATA TYPES. N & M messages are broadcast by controllers in a sequenced system.
Remaining exchanges may be initiated by a monitor or master on non-sequenced systems,
or during the time immediately following a monitor enable in a sequenced system.
MESSAGE TYPE
FORMAT
EXAMPLE
N – Net status broadcast
##N19,2,23,17,18xx
01N0,115,2000,M,C88
Controller’s broadcast status in stand-alone sequencing.
Data fields are:
19- Capacity in cfm
2- P2 pressure in psig
23- Sequence hours
17- Run Status (See DATA TYPES)
18- Mode (See DATA TYPES)
M – Monitor Enable broadcast ##Mxx
01M52
Controller’s monitor enable in stand-alone sequencing.
Time follows for queries by a monitor.
I – Information Request
##Ixx
01I56
Monitor’s request for controller information. The controller responds with i message type.
i – Display Response
##i1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18xx
Example:
01i104,95,41,78,110,127,101,83,186,3,2,0008,3C2,3C2,0,0,E,c26
The controller’s response to a valid message type D request.
1- P1 pressure in psig
2- P2 pressure in psig
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