Comtech EF Data CDM-800 Especificaciones descargar pdf (Pagina 111)

CDM-800 Gateway Router Revision 1

Serial-based Remote Product Management MN-CDM800

6–3

When the user ‐supplied terminal emulator program is configured correctly, upon power‐up of the CDM‐800, the CLI Info Screen

appears, followed by the CLI command prompt CDM‐800>. From here, type “help[cr]” or “?[cr]” (without the quotes) to display the

CDM‐800availablecommandsandqueries,andtoreviewinstru

ctionsforusingtheinterface.

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 se rial characters, suitable for transmission and rec eption to the Controller using a

universalasynchronousreceiver/tran sm itter(UART).Controller‐to‐TargetdataiscarriedviaEI

A‐232electricallevelsononeconductor,and

Target‐to‐Controllerdataiscarriedintheotherdirectionontheotherconduc t or:



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

informationfrom(queries)–theTargetdevice(i

.e.,theCDM‐800).



• 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(Controller‐to‐Target) requirearesponse(Target‐to‐Controller).Thisresponseiseither

to return da

ta that has been querie

d 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 transmitted, 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messagesfromCont

roller‐

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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