Clearone-comm PSR1212 Manual do Utilizador

PSR1212 Digital Matrix MixerInstallation & Operation Manual

Ensure that the following items were received with your shipment:Introduction ~ Unpacking4Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-

Appendices ~ Appendix E: Serial94Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Meter type definitionsSerial command error codesError

95Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760PSR1212 Serial commandsCommand FunctionAAMB Selects/reports adapt ambient settingAGC

96Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsCommand FunctionNOM Selects/reports NOM sett

97Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsAAMB - Adaptive Ambient ModeThis command sel

98Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsBAUD - Baud RateThis command selects/reports

99Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760COMPRESS - Compressor AdjustThis command selects/reports the setting of the compress

Appendices ~ Appendix E: Serial Commands100Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760DECAY - Decay AdjustThis command selects/re

101Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760DFLTM - Default MeterThis command selects/reports the setting of the default meter.

Appendices ~ Appendix E: Serial Commands102Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760FILTER - Filter AdjustThis command selects/

103Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsFILTSEL - Filter SelectThis command turns o

5Introduction ~ Controls and ConnectionsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760C. s/tThese buttons scroll up and down through

104Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsFPP - Front Panel PasscodeThis command sets

105Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsGATE - Gate StatusThis command reports the

Appendices ~ Appendix E: Serial Commands106Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760GMODE - Gating ModeThis command selects/rep

107Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsGREPORT - Gate ReportThis command selects/r

108Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760LFP - Lock Front PanelThis command sets and reports front panel access for the unit

109Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsLOCKPRST - Apply the lock to a preset ormac

LVLREPORT - Level ReportThis command selects level status reporting.Command form: DEVICE LVLREPORT<Channel> <Group> [Position] [Value]Argu

111Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsMACRO - Macro Execution/ReportingThis comma

MDMODE - Modem ModeThis command enables or disables the modem mode for the unit. When the modemmode is enabled, the modem initialization string is sen

113Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsMINIT - Modem Initialization StringThis com

Introduction ~ Controls and ConnectionsPower is supplied through the RS-485 ports to the remote Control Panelsfrom the PSR1212. This power is limited

MLINE - Mic/Line AdjustThis command selects/reports the setting of coarse gain adjustment on the inputchannels 1-8. The three settings are 0dB, 25dB,

115Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsMTRX - MatrixThis command selects/reports t

MUTE - MuteThis command selects/reports the setting of mute on input, output or processingchannels.Command form: DEVICE MUTE<Channel> <Group&

117Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsPAA - PA Adaptive ModeThis command selects/

118Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsPRGSTRING - Program StringThis command sets

119Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsRAMP – Ramp Gain AdjustmentThis command sta

120Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760REFSET - Reference channel setupThis command selects/reports the output the referen

121Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760SFTYMUTE - Safety muteSelects/reports the state of the safety mute. When on, the sa

122Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsSIGTOUT - Signal Generator Time OutSets the

123Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760UID - Unit IDThis command reports the unit ID. This command is read only.Command fo

7Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Introduction ~ NetworkingNetworkingThe latency orpropagation delay is<1ms.-Expansi

Appendices ~ Appendix F: Warranty124Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760ClearOne Communications, Inc. (Manufacturer) warra

125Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix F: Warranty

Appendices ~ Appendix G: Compliance126Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760FCC Part 15 ComplianceThis equipment has been te

Glossary127Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Adaptive AmbientThis portion of the mixer monitors the varying ambient nois

128Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760GlossaryClippingA condition in which a signal level exceeds the maximum level a cir

Glossary129Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Decay Rate (slow, medium, fast)Determines how fast a channel gates off afte

130Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Glossarythe designated frequency occurs at a fixed 6dB/octave rate. The gain or los

Glossary131Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760GPIO (general purpose input/output)The Control/Status A and B ports on theP

132Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760GlossaryMixer modeThe mixer mode has two settings: master and slave. Mixer mode can

Glossary133Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760•PresetThe preset password is created in the Unit Properties window and mak

Introduction ~ Operational Requirements8Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Power The PSR1212 automatically accommodates v

134Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760S–Z buses These eight buses are defaulted as auxiliary mix buses. They are used tor

Glossary135Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760you to reference multiple signals without sacrificing an analog output. You

Index136Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Aadaptive ambient 37, 37, 83, 97, 127add unit 24AGC see automatic gain c

Index137Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760gain structure 41, 43, 45, 52, 130Gate 35, 105–107, 130activation 35adap

Index138Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760NNOM 30, 35, 44, 45, 116, 132non-gated 5, 29, 30, 35Notch 34, 49, 83, 10

139IndexTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760signal generator 65site file 23, 24, 134Site Properties 16, 23, 25, 134C

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760The PSR1212 is designed for easy installation and setup. All connections are madethrou

Installation ~ Hardware Setup10Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760To connect the unit1. Place the unit in a standard 19-i

11Installation ~ Networking UnitsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Expansion bus connectionsUsing the Expansion Bus port

Installation ~ Networking Units12Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Device IDsOnce your expansion bus connections are mad

13Installation ~ LCD ProgrammingTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760The PSR1212’s front panel is intuitive to operate, tha

iiTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760©2002 ClearOne Communications, Inc. Allrights reserved. No part of this document may

Installation ~ LCD Programming14Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760The five main menus are: System, RS-232, Meter, Inputs

15Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Installation ~ LCD ProgrammingMenu items can still bescrolled through whenthe panel

Installation ~ LCD Programming16ClearOne recommendsthat you leave FlowControl enabled.-The modem initializationstring can be set only viathe MINIT ser

17Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Installation ~ LCD ProgrammingInputsSelect which input (1–12) you want to monitor on

Installation ~ LCD Programming18Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Outputs menuThere are two submenus under the Outputs m

19Installation ~ LCD ProgrammingTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Fine Input GainPhantom Powe rOn/OffMic 55, 25LineFine

20Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760CHAPTER 3: System ConfigurationG-Ware RequirementsClearOne’s G-Ware software provides

System Configuration ~ Installing G-Ware22Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760To select an alternatedestination directory,

23System Configuration ~ Site SetupTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Site SetupCreating a new siteNew site files are cre

iiiTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760PSR1212 Installation and Operation ManualTable of ContentsCHAPTER 1: Introduction

System Configuration ~ Site SetupAdding a PSR1212You can add a PSR1212(s) to your site file by connecting to your site and using G-Ware to automatical

25Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760System Configuration ~ Site SetupConfiguring Unit PropertiesUsing the Unit Propertie

System Configuration ~ Site Setup26Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-37608. If a modem is connected to the PSR1212 unit, se

G-Ware has three modes: Configuration, Preset, and Macro Recorder. Configurationis used to configure the unit and is the default mode. The Preset and

28Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760System Configuration ~ G-Ware ScreensFigure 3.17. Unitshortcut menuFigure 3.19.Safet

Matrix ScreenThe Matrix Screen is used to route audio to one or more destinations (outputs,expansion bus, or processing). Any number of connections to

System Configuration ~ Audio Routing30Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Audio is routed in the Matrix Screen (see Figure

31System Configuration ~ Audio RoutingTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760numerical value directly in the window). The att

System Configuration ~ Inputs and Outputs32Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Inputs 1–8To open the Inputs 1–8 configurat

33System Configuration ~ Inputs and OutputsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-376012dB closer to the target. AGC occurs after

ivTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760CHAPTER 3: System Configuration . . . . . . . . . . . . . . . .21G-Ware Requirement

System Configuration ~ Inputs and Outputs34Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760• Low Pass. Selectable frequency cutoff is

35System Configuration ~ Inputs and OutputsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760To configure filters1. In either the graph

System Configuration ~ Inputs and Outputs36Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Chairman OverrideChairman Override provides

37System Configuration ~ Inputs and OutputsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Ambient Level if you want to specify a fixe

System Configuration ~ Inputs and Outputs38Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760If you select a virtual reference, the Virt

39System Configuration ~ Inputs and OutputsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Gating Group SelectIn addition to specifyin

System Configuration ~ Inputs and Outputs40Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-37603. Leave 1st Mic Priority selected (default

41System Configuration ~ Inputs and OutputsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760commands are used.Optimizing input gain str

System Configuration ~ Inputs and Outputs42Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Inputs 9–12The PSR1212 supports four line l

43System Configuration ~ Inputs and OutputsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760GainThe Gain slider on the selected input i

vTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760CHAPTER 5: Operation . . . . . . . . . . . . . . . . . . . . . . . .65Utilities . .

System Configuration ~ Inputs and Outputs44Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Outputs 1–12The PSR1212 has 12 line level o

45System Configuration ~ Inputs and OutputsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760passing NOM information. Enable NOMif you w

System Configuration ~ Expansion Buses46Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760From Expansion Bus O–ZClick the From Expansion

47System Configuration ~ ProcessingTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Processing A–HThere are eight processing blocks in

System Configuration ~ Processing48Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Cmprs (compressor)Cmprs opens the Compressor Setup

49System Configuration ~ ProcessingTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Post Compressor Gain Adjust the compressor gain wi

System Configuration ~ Processing50Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760The frequency response and phase vs frequency of th

51System Configuration ~ ProcessingTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Refer to the figure above. Note that as you create

System Configuration ~ Processing52Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Introducing an appropriate amount of delay to the f

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760CHAPTER 4: AdvancedConfigurationPresets OverviewFor many audio conferencing applicati

viTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760

Advanced Configuration ~ Presets54Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Figure 4.3. Preset Configuration paneMatrix ScreenTh

55Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Advanced Configuration ~ PresetsFigure 4.5. Preset Macros WindowPreset Description.

Advanced Configuration ~ Presets56Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Virtual Reference. The Virtual Reference button open

57Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Advanced Configuration ~ PresetsTo create a preset1. From the Preset Selection list,

Advanced Configuration ~ Presets58Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Running presetsPresets can be run from G-Ware or the

59Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Advanced Configuration ~ PresetsIf a preset is flagged as “On,” nothing will happen

Advanced Configuration ~ Presets60Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760The four macros (one for each configuration) are set

61Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Advanced Configuration ~ MacrosA macro is a series of commands which can be run from

Advanced Configuration ~ Macros62Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760To create a macro using Macro Editor1. Click the Macr

63Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Advanced Configuration ~ Macros9. Click Add to place the command into the macro. The

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Congratulations on purchasing the PSR1212, a highly advanced twelve-by-twelvedigital m

Advanced Configuration ~ Macros64Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Running macrosMacros can be run from G-Ware or the fr

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760G-Ware features several tools designed to assist you as you install your PSR1212Digita

Operation ~ Utilities66Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760To use tone1. Select the PSR1212 Unit and Input Channel the sig

67Operation ~ UtilitiesTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-37604. Repeat steps 1–3 to select the second second unit, site, or

Operation ~ Utilities68Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-37606. To print the report, click Print (you can also click Print

69Operation ~ UtilitiesTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760In the window shown in Figure 5.8, clicking the Site 1button tr

Operation ~ Utilities70Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760GFirm Firmware UtilityTo make it easy to upgrade your unit when

71Operation ~ UtilitiesTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-37605. Select the PC COM port you are using for the upgrade. Select

Operation ~ Utilities72Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760G-Ware SwitcherG-Ware Switcher allows you to alternate between

73Operation ~ Monitoring ViewsTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760If the selected G-Ware version is not active, click Re-R

Introduction ~ New Features2Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760New Features• Virtual references. The PSR1212 now features

74Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Meter ViewsThe Meter Views window allows you to monitor the level of any input, outp

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760There are many ways to control your PSR1212 and other networked units. Thischapter exp

Control ~ Remote Builder76Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760The Remote Builder window is used to configure the optional

77Control ~ Remote BuilderTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760To program the XAP IR Remote1. Select an ID number for the r

Control ~ Remote Builder78Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760To program the Volume panel1. Select an ID number for the re

79Control ~ Remote BuilderTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-37606. Select the Device Type, ID, and Command from their respec

Control ~ RS-232 Port80Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-37605. Click the Active Command or Inactive Command button to set t

81Control ~ RS-232 PortTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Command stringsBy creating command strings, you can use your PS

82Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760

Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760APPENDICES Dimensions (LxDxH)17.25" x 10.25" x 1.25"43.8 x 26 x 4.5 cmW

3Introduction ~ Professional Services GroupTechnical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Professional Services GroupIf you need any

Appendices ~ Appendix B: Pinouts84Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendix B: PinoutsRS-232 COM DCE port pinout (femal

85Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix B: PinoutsControl/Status A Port Pinout (female)Pin Definable T

86Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Control/Status B port pinoutPin Definable* Type Default Description1 No C Preset se

87Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix B: PinoutsSet connector pinoutPin Description Pin Description1

Appendices ~ Appendix C: Control Panel88Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendix C: Control PanelThis equipment must b

89Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix C: Control Panel6. Connect one connector terminator block to t

Appendices ~ Appendix C: Control Panel90Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760VOLUME CONTROL PANEL 910-155-051FLAT HEADSCREW

91Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix D: AccessoriesAccessory ClearOne Part NumberTabletop Omni Micr

92Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsThe PSR1212 accepts serial commands through

93Technical Services Group ~ 1-800-283-5936 (USA) ~ 1-801-974-3760Appendices ~ Appendix E: Serial CommandsGroups and channelsIf a channel has an alpha