Datasheet

9/29/2015 ETH0621
http://www.robotelectronics.co.uk/htm/eth0621tech.htm 8/11
0passwordprotectionisenabledandpasswordentryisrequiredbeforechangescanbemade
1to30secondsuntilTCP/IPpasswordprotectionisreenabled.Allauthorisedcommandssetthetimerbackto
30seconds(includingthisone).
255TCP/IPpasswordisnotenabled.
IPAddresses&DHCPServers
TheeasiestwaytousetheETH0621istoconnectittoanetworkwithaDHCPserver,inthiscasetheETH0621
willhaveitsIPaddressassignedautomaticallybytheDHCPserver.
IfthereisnoDHCPserveronthenetwork,thenafixedIPaddressof192.168.0.200isused.Tocontrolthe
ETH0621usingthisfixedIPaddressyourcomputerMUSTbeonthesamesubnet.
ThenextstepistosetyourcomputersIPaddressto192.168.0.xwherexisintherangeof1to255butnot200
(theETH0621isthere!)oranyotherusedIPaddressesonthenetwork.
ThesubnetmaskdictateswhatIPaddressesthePCcancommunicatewith,wesetthisto255.255.255.0sothePC
cantalktoanymodulewithanIPaddressof192.168.0.x
ThedefaultgatewayislikelytobetheIPaddressthattheinternetconnectionislocatedatandtheDNSservercan
beeitheryourrouteraddressorGoogleprovideaDNSserviceat8.8.8.8..
ThisimageisforaPCrunningWindows7.
TogettotheTCP/IPpropertiesscreen,goto:
ControlPanel>NetworkandSharingCenter
>LocalAreaConnection>Properties.
SelectInternetProtocolVersion4(TCP/IPv4)from
thescrollboxandclickProperties.
Thatgetsyoutothedialogboxshownleft.

Testprogramandexamplesourcecode
TogettheETH0621upandrunningintheminimumamountoftimewehaveputtogetheranexampleprogramto
demonstratethefunctionalityofthemodule.Weprovidethefullsourcecodeforthisprogram.Youmayexamine
thiscodetoseehowitworksoruseitasastartingpointforyourownapplication.