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AMX VST Instruction Manual

AMX VST Instruction Manual

Programming protocol reference guide
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instruction manual
ViewStat
Programming Protocol Reference Guide
H VA C C o n t r o l s

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Summary of Contents for AMX VST

  • Page 1 instruction manual ViewStat Programming Protocol Reference Guide H VA C C o n t r o l s...
  • Page 2 This warranty extends only to products purchased directly from AMX Corporation or an Authorized AMX Dealer. AMX Corporation is not liable for any damages caused by its products or for the failure of its products to perform. This includes any lost profits, lost savings, incidental damages, or consequential damages. AMX Corporation is not liable for any claim made by a third party or by an AMX Dealer for a third party.

  • Page 3: Table Of Contents

    Table of Contents ViewStat Programming Protocol ...1 Network Communication ... 1 Explicit Address Commands ... 1 Global Address Commands ... 2 Unsolicited Responses... 2 Multiple Commands ... 3 Network Override or Hold... 4 How to Detect When a Thermostat Has Gone Off-line ... 4 Command Set Syntax ...
  • Page 4 Table of Contents ViewStat Communicating Thermostat - Programming Protocol Reference Guide...

  • Page 5: Viewstat Programming Protocol

    ViewStat. For detailed information on using the module, refer to the ViewStat Communicating Thermostat Instruction Manual ("Using the NetLinx Module" section), available on the AMX.COM web site. Network Communication Network communication is non-isolated, full duplex RS-422 using 4 + 1 wires. The 'A' terminals are the transmit pair while the 'B' terminals are the receive pair.

  • Page 6: Global Address Commands

    X*265 milliseconds (X is defined as the number of thermostats on the network, which is configurable in Thermostat Setup), since the unit will only respond in its unique opportunity.

  • Page 7: Multiple Commands

    TIP: If responses are desired to a large number of commands, set the Command Response to Quiet, send the commands (either globally or explicitly), then query individual thermostats (explicitly). Return the command response to Normal when done. As an example consider a 64 thermostat system.

  • Page 8: Network Override Or Hold

    ViewStat Programming Protocol 3. Set the "Number of Thermostats on the Network" to the highest addressed thermostat. If you have only six thermostats address them 1 through 6 and set the highest address to six. 4. Only turn on the necessary change of state variables (COS - refer to the command descriptions).

  • Page 9: Command Set Syntax

    Omitting the address, or using a 0 (zero) in place of a space makes the command global, and all connected thermostats will respond. Following this initial command sequence, spaces may be inserted at this point only, for clarity between commands. The next portion is the command or variable .

  • Page 10: Programming Quick Reference

    ViewStat Programming Protocol Programming Quick Reference All of the commands are summarized in the following list. A detailed description of each command follows the table. Unless otherwise noted as "Read Only" or "Write Only", all commands are "Read and Write". Programming Quick Reference Command Description...
  • Page 11 Programming Quick Reference (Cont.) Command Description Heat Mode Set Point Increment heat set point SH++ Decrement heat set point SH-- Cool Mode Set Point Increment cool set point SC++ Decrement cool set point SC-- Current Mode Set Point Increment current mode set point SP++ Decrement active set point SP--...
  • Page 12 ViewStat Programming Protocol Programming Quick Reference (Cont.) Command Description Temperature value above which W1 terminal HIBP is locked out (heat pump equipment configura- tion only). Temperature value below which compressor LOBP terminals are locked out (heat pump equip- ment configuration only). Thermostat date value DATE Thermostat time value...
  • Page 13 Programming Quick Reference (Cont.) Command Description Reports the setting of the thermostat configu- EQUIPCONFIG ration DIP switches Reports ready state of photosensor BLREADY Sets relative room light intensity level required BLTRIG to put backlight in ready state Turns on backlighting, regardless of ready BLTON state, for 10 seconds.

  • Page 14: Communication Control Commands

    Response Control command allows you to change the response actions. Syntax: "'SN<address> CR=<mode>'" Variables: • <address> = 0 (all thermostats), or 1 through 64 (thermostat-specific address) • <mode> = S, N, Q S (SILENT) - Viewstat will not reply to any command. Action commands (telling ViewStat to change a setting) will be acted upon, but no response will be returned indicating that the action was performed.
  • Page 15 Communication Control Commands (Cont.) Command (C1 - C12) Change-Of-State (COS) notify commands: The ViewStat can be configured to send out a message upon a Change-Of-State (COS) for any of the variables below. Simply turn on the COS flag for any of the variables for which the automation system needs to be kept informed.
  • Page 16 ViewStat Programming Protocol Communication Control Commands (Cont.) Command COS - Scroll Up (thermostat button) COS - Scroll Down (thermo- stat button) COS - Enter Button activation COS - Backlight Ready (Cont.) Description When the scroll-up button (top button next to the text messaging display) is pressed or released.
  • Page 17 Syntax: SN[address] HOLD=ON or OFF Parameters: • <address> = 0 (all thermostats), or 1 through 64 (thermostat-specific address) The ViewStat incorporates an ENTER button. This button has three functions: • Thermostat Set-up - During Thermostat Set-Up the user interacts with the text messaging display to select various operational parameters and this button is used to enter those selections.
  • Page 18 Syntax: SN[address] NAME={text string} Parameters: • <address> = 0 (all thermostats), or 1 through 64 (thermostat-specific address) • <text string> = text string used as an identifier for the specified thermostat. String must be 16 characters or less - no spaces allowed.

  • Page 19: Thermostat Sensing Commands

    Thermostat Sensing Commands These commands are used to inquire and set scale for the various temperature or humidity values read by the thermostat The following command descriptions describe the use of the command when setting a particular variable. Inquiries can be made with all commands (with the exception of the commands) to determine the existing value of a variable.
  • Page 20 ViewStat Programming Protocol Thermostat Sensing Commands (Cont.) Command Thermostat Humidity Remote Sensor Mod- ules 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.
  • Page 21 Thermostat Sensing Commands (Cont.) Command RxSy Remote Sensor Value (x=1-4, y=1,2) Thermostat Remote "Outdoor" Temperature Thermostat Remote "Outdoor" Humidity ViewStat Communicating Thermostat - Programming Protocol Reference Guide Description Up to four addressable support-modules can be connected to a thermostat's local communication network (LCN).

  • Page 22: Thermostat Hvac Operational Commands

    ViewStat Programming Protocol Thermostat HVAC Operational Commands These commands are used for temperature control and other thermostat operational parameters. The following command descriptions describe the use of the command when setting a particular variable. Inquiries can be made with all commands (with the exception of the commands) to determine the existing value of a variable.
  • Page 23 Thermostat Action Commands (Cont.) Command SC++/SC -- Increment Or Decrement Temperature Setting - Cool Current Mode Temperature Set- ting SP++/SP -- Increment Or Decrement Current Mode Temperature Setting ViewStat Communicating Thermostat - Programming Protocol Reference Guide ViewStat Programming Protocol Description These commands are used to raise (SC++) or lower the (SC--) the cool temperature setting by a specified value.
  • Page 24 0.5° while second stage will be activated at 0.5° + 1.5° = 2° above or below the setting. Thermostats are factory set to be accurate to within 1° between 60°F and 80°F. Temperature comfort however can be a relative condition, so the ViewStat allows the temperature displayed on the thermostat to be artifi- cially offset.
  • Page 25 Thermostat Action Commands (Cont.) Command SHUM++/SHUM - - Increment Or Decrement Humidify Setting SDEH Dehumidify Control Setting SDEH++/SDEH - - Increment Or Decrement Humidify Setting ViewStat Communicating Thermostat - Programming Protocol Reference Guide ViewStat Programming Protocol Description These commands are used to raise (SHUM++) or lower the (SHUM--) the humidify setting by a specified value.
  • Page 26 ViewStat Programming Protocol Thermostat Action Commands (Cont.) Command MODE Thermostat Mode Of Operation Hvac Fan Operation Description This command dictates what equipment the thermostat will turn on/off to control temperature. In the HEAT mode, only the heating equipment will be used, in the COOL mode, only the cooling equipment will be used. When the thermostat has been configured to operate a heat pump (this is a DIP switch configuration on the thermostat), Emergency Heat (EMHT) mode is available.
  • Page 27 ViewStat Communicating Thermostat - Programming Protocol Reference Guide ViewStat Programming Protocol Description Thermostats control HVAC units by energizing various relays within the thermostat completing a circuit to the HVAC controls. This command reports the on or off state of each relay within the thermostat.
  • Page 28 ViewStat Programming Protocol Thermostat Action Commands (Cont.) Command HIBP & LOBP High And Low Balance Point (Applicable Only For Heat Pumps) Description Heat pumps, when operating in the heating mode, extract heat from the outdoor air and transfers it to the indoor air. An auxiliary source of heat is usually present on heat pump systems to meet the heating demand when the heat pump can not meet the capacity needs.

  • Page 29: Text Messaging Commands

    Text Messaging Commands ViewStat incorporates two displays, a segmented display and a two-line, 16-character per line text messaging display. These commands are used to control the text messaging display. Text Messaging Support Characters FIG. 1 shows the correspondence between character codes and character patterns. FIG.
  • Page 30 ViewStat Programming Protocol Text Messaging Commands Command DATE Text Messaging Display - Date Description ViewStat has a counter and can maintain a clock, once set, with reason- able accuracy over a 24-hour period. Therefore it is necessary to send ViewStat the current Date and Time from the automation system at least once per day.
  • Page 31 Text Messaging Commands (Cont.) Command TIME Text Messaging Display - Time ViewStat Communicating Thermostat - Programming Protocol Reference Guide ViewStat Programming Protocol Description The ViewStat has a counter and can maintain a clock, once set, with rea- sonable accuracy over a 24 hour period. Therefore it is necessary to send ViewStat the current Date and Time from the automation system at least once per day.
  • Page 32 ViewStat Programming Protocol Text Messaging Commands (Cont.) Command PMES1 - PMES4 Text Messaging - Rotating Message Display Description ViewStat can store and display up to four messages on a rotating basis. The text messaging display is a two-line, 16-character display. The first character in the top line of the display is filled with the first character in the text string of the command.
  • Page 33 Text Messaging Commands (Cont.) Command TMPMES Text Messaging - User Reset Message MENU Text Messaging - User Interactive Mode Text Messaging - User Interface Message ViewStat Communicating Thermostat - Programming Protocol Reference Guide ViewStat Programming Protocol Description With this command messages can be shown on the text messaging dis- play that must be acknowledged by the user at the thermostat to reset.

  • Page 34: Keypad Lockout Commands

    ViewStat Programming Protocol Keypad Lockout Commands Use of the buttons on the thermostat can be locked out to varying degrees using the following commands. The following command descriptions describe the use of the command when setting a particular variable. Inquiries can be made with all commands (with the exception of the commands) to determine the existing value of a variable.
  • Page 35 Keypad Lockout Commands (Cont.) Command NETLK Network Override (Hold) Lockout UPDNLK Temperature Change Lockout ViewStat Communicating Thermostat - Programming Protocol Reference Guide ViewStat Programming Protocol Description ViewStat incorporates an ENTER button, which has three functions: • User Interactive Thermostat Set-up: During thermostat set-up the user interacts with the text messaging display to select various operational parameters and this button is used to enter those selections.
  • Page 36 ViewStat Programming Protocol Keypad Lockout Commands (Cont.) Command LKTIME Lockout Time Limit LKLIMIT Lockout Temperature Change Limit Description Thermostat functions can be locked out to thermostat keypad changes to various levels. One of those levels allows changes for a period of time determined by the LKTIME command.

  • Page 37: Auxiliary Information Commands

    The first of these values (w) corresponds to servant (0 or off) or master (1 or on) designation. Thermostats designated as "master" will communicate the value of a remote sensor to which it is attached to the rest of the ther- mostats on the network.
  • Page 38 ViewStat Programming Protocol Auxiliary Information Commands (Cont.) Command BLTRIG Backlight Trigger BLTON Turn Backlight On ENTR Enter Button Status SCUP & SCDN Scroll Up And Scroll Down Button Status Description A photosensor is integrated on the thermostat circuit board to put the dis- play backlighting (both the segmented display and the text messaging dis- play) in a ready state depending on the intensity of the ambient light.
  • Page 39 ViewStat Programming Protocol ViewStat Communicating Thermostat - Programming Protocol Reference Guide...
  • Page 40 AMX reserves the right to alter specifications without notice at any time. brussels • dallas • los angeles • mexico city • philadelphia • shanghai • singapore • tampa • toronto* • york 3000 research drive, richardson, TX 75082 USA • 469.624.8000 • 800.222.0193 • fax 469.624.7153 • technical support 800.932.6993...

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