Comtech EF Data CDD-880 Spezifikationen PDF herunterladen (Seite 103)

CDD-880 Multi Receiver Router Revision 1

Serial-based Remote Product Management MN-CDD880

6–3

6.2 Remote Commands and Queries Overview

6.2.1 Basic Protocol

InanEIA‐232configuration,theControllerdeviceisconnecteddirectlytotheTargetdeviceviaatwowire‐plus‐groundconnection.Alldata

is transmitted in framed packets as asynchronous seri al characters, suitable for transmission and receptio n to the Controller using a

universalasynchronousreceiver/tr an sm itt er(UART).Controller‐to‐Targetdataisca

rriedviaEIA‐232electricallevelsononeconductor,and

Target‐to‐Controllerdataiscarriedintheotherdirectionontheotherc onduc tor:



• Controller‐to‐Target:TheControllerdevice(e.g.,theuserPC/CLI)isusedtotransmitinstructions(comm a nds)to–ortorequest

informationfrom(queries)–theTarge

tdevice(i.e.,theCDD‐880). 



• Target‐to‐Controller:The Target,inreturn,only  transmitsresponse informationto theController whenspecifically directedby

theController.



ForSerialRemoteControl,allissuedcommands(C ontroller‐to‐Target)requirearesponse(Target‐to‐Controller).This responseiseither

to return  da

ta that has been queried by the Controller, or to confirm the Target’s receipt of a command to change the Target’s

configuration.

6.2.2 Packet Structure

The exchange of information is trans mitted, Controller‐to‐Target and Target‐to‐Controller, in ‘packets’. Each packet contains a finite

numberofbytesconsistingofprintableASCIIcharacters,excludingASCIIcode127(DELETE).



Inthis context,theCarriageReturnandLineFeedcharactersareconsideredprintable.Withoneexception,allmessag

esfromController‐

to‐Targetrequirearesponse–thiswillbeeithertoreturndatathathasbeenrequestedbytheController,ortoacknowledgereceptionofan

instructiontochangetheconfigurationoftheTarget. 



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