Appendix A
TR16 Serial Network Command and Variable List
Refer to the RCS Serial Communications Protocol Manual, DCN 150-00225 for details of message formats
and commands. These may change with newer firmware versions.
Network Message Format:
Device
Address, Originator (optional if address is 0), Command
Example command: A=1 O=0 R=1 or just A=1 R=1
Translates to a command for thermostat address 1, (originator address = 0), Request Status command
R1. (commas or spaces separate message elements)
Command
Description
BF
Set
Setback
Flag.
CFM
Set F or C temperature Mode
DL
Set Display Lock
F
Set Fan Mode
M
Set
System
Mode
OT
Set Outside Air Temperature Data (for network supplied OT)
SB
Set Setback Mode
SP
Set Setpoint (for single setpoint systems)
SPC
Set
Cool
Setpoint
SPH
Set
Heat
Setpoint
SVx
Set
Variable
number
x
R=1
Request Status Message 1 Returns Thermostat data (temp, setpoints, mode, fan)
R=2
Request Status Message 2 Returns HVAC data (heat/cool/fan outputs, MOT/MRT delays)
R=3
Request Status Message 3 Returns only Temperature data
R=4
Request Status Message 4 Returns only Setpoint data
R=5
Request Status Message 5 Returns only Mode data
R=6
Request Status Message 6 Returns Model/Version number of WDU and Control Unit
R=9
Request Status Message 9 Returns state of setup dipswitch settings
Network Variables (for SVx command)
Example: A=1, SVx=? will return current value of variable.
Variable
Number Name
Variable Data
Default value
Notes
1
System Type
0,1
0
0 = Gas/Electric, 1 = Heat Pump
2
Fan Type
0,1
0
0 = Gas (No fan w/Heat), 1= Electric (Fan w/Heat)
3
Change Over Type
0,1
0
0 = C/O w/cool, 1= C/O w/heat
4
C/F Type
0,1
1
0 = Centigrade, 1= Fahrenheit
5
Network Address
1-254
1
Reserved: 0 = host, 255 = global
9
Display lock
0,1
0
0 = unlocked, 1= locked
10
MOT (Min Off Time)
0-9 min
6 min
0 = 20 sec test time
11
MRT (Min Run Time)
0-9 min
6 min
0 = 20 sec test time
12
H Delta Stage 1 On
0-8 deg
1 deg
Turn on a 1 degree below setpoint
14
H Delta Stage 2 On
0-8 deg
3 deg
Turn on at 3 degrees below setpoint
16
H Delta Stage 3 On
0-8 deg
5 deg
Turn on at 5 degrees below setpoint
18
C Delta Stage 1 On
0-8 deg
1 deg
Turn on at 1 degree above setpoint
20
C Delta Stage 2 On
0-8 deg
3 deg
Turn on at 3 degrees above setpoint
24
Setpoint H/C Delta
3-15 deg
4 deg
Min Delta T between H/C Setpoints
69
Service (Test) Mode
0,1
0
1 = Test Mode, sets all delays = 20 sec
74
AutoSend mode
0,1
0
0=OFF, 1= ON, send temp/mode on change
DCN: 141-00930-09 7/13/06
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