Display Devices PJE Outdoor Projector Enclosures User Manual
Page 9
Custom Projector Enclosure
8/15/2005
Temperature Controller with
Active AC and Heater
RS232 Interface
Hardware
Standard three pin hookup, 2,3,5, on DB9. Baud rate 9600,N,8,1. No handshaking.
Software
ASCII letters followed by a delimiter, carriage return (ASCII 13).
Commands from Host to Controller:
Command Description Example
Q
Request Current Temperature
Q
↵
Axxx
Set Level that AC turns on/off at
(will turn on if temp above this level)
A080
↵
Bxxx
Set Level that Heater turns on/off at
(will turn on if temp below this level)
B050
↵
Cxxx
Set Alarm Level (alarm on if hotter than this level)
C110
↵
Dxxx
Set Power Cutoff Level (cutoff if above this level)
D120
↵
xxx-temperature
↵
Carriage Return (13)
Communications from Controller to Host:
Command Description Example
Txxx Current
Temperature
T073
↵
G AC
On
G
↵
H Heater
On
H
↵
I Alarm
On
I
↵
J
Power has been switched off
J
↵
S (O,C)
Door Switch is Open/Closed
SO
↵
SC
↵
M
Motion Sensor Tripped
M
↵
K
Received Set command, Executed OK
K
↵
X
Can not understand Command
X
↵
xxx-temperature
↵
Carriage Return (13)
Notes: All temperatures are in Fahrenheit. Host program to convert to Celsius if required. G,H,I,J are
sent every few seconds when those levels have been tripped. S is sent upon change of state. M is sent
upon shock sensor being tripped. Temperatures range is from 1 to 250. Temperature and settings are
in two degree increments. On reporting only, if current temp is negative, then response will be T-015.
Do not set Axxx equal or below Bxxx !
Heater will turn off when door is open.