AMX VST Instruction Manual page 20

ViewStat Programming Protocol
Thermostat Sensing Commands (Cont.)
Command
HUM
Thermostat Humidity
RSM
Remote Sensor Mod-
ules
16
Description
Connecting an optional support module, configured for humidity control, to the View-
Stat changes it from a temperature controller to a humidity controller. Thermostat
humidity is that shown on the display of the thermostat and against which the humidity
settings are compared for control purposes. This humidity reading is that measured
attached support module(s) configured for humidity control. ViewStat responds with
the humidity reading appended by a "%" for clarity.
Syntax:
SN[address] HUM?
Reply Format:
SN[address number] H={value}%
Up to four addressable support-modules can be connected to a thermostat's local
communication network (LCN). Two sensors can be connected to each support mod-
ule, each can be a temperature sensor or a humidity sensors depending on the sup-
port module model. Each sensor can be individually configured as control sensors or
remote sensors (for display only). This command returns the number of support mod-
ules connected to a thermostat, what type of sensors are attached to them and how
those sensors are configured.
Syntax:
SN[address] RSM?
Reply Format:
SN[address] RSM= M1:S1,S2 M2: S1,S2 M3: S1,S2 M4: S1,S
The response is made up of the number of modules (Mx) and the type of each of the
two sensors connected to that module (RT, CT, RH, CH or XX). The first sensor listed is
considered sensor #1 for that module and the second listed is considered sensor #2.
If there is no support module at a module address then it will not be shown. S1,S2
show what type of sensor is connected as sensor #1 and Sensor #2 respectively.
Sensor (S1, S2) options include:
• RT: Remote temperature sensor (i.e. for display only)
• CT: Control temperature sensor (i.e. replaces control value of thermostat)
• RH: Remote humidity sensor
• CH: Control humidity sensor
• XX: No sensor attached at this position
Following is an example that illustrates the response (commands are bold responses
are shown in italics):
SN1 RSM?
(Request information about sensors connected to thermostat with address #1.)
SN1 RSM= M1:RT,RT M2:CT,CT M3:RH,CT
(ViewStat responds that there are three support modules attached to thermostat 1,
that there are two remote temperature sensors on the module with address #1, two
control temperature sensors on the module with address #2 and that the module
with address #3 has a remote humidity sensor as sensor #1 and a control
temperature sensor as sensor #2).
ViewStat Communicating Thermostat - Programming Protocol Reference Guide