Raveon wireless modems have a number of ways an installer can verify that the system is working properly.\u00a0 This application note describes how to verify signal strength on Raveon’s VHF and UHF data radio modems.\u00a0\u00a0<\/p>\n
The command ATRS<\/strong>returns the signal strength (in dBm) of the last message that the radio modem you issue it to received.\u00a0<\/p>\n The wireless data radio modem must be in the “Command Mode”.\u00a0 To put the radio modem into the Command Mode, connect to the radio modem using a terminal program such as HyperTerminal or TeraTerm.\u00a0\u00a0 If the data radio modem has Ethernet capability, log into it as administrator. \u00a0Issue the +++ sequence.\u00a0 this is three plus signs, with nothing before or after them.\u00a0 The radio modem will respond with its model\u00a0number and an OK:<\/strong> prompt when it enters the command mode.\u00a0<\/p>\n When you are in the command mode, type ATRS<\/strong> followed by the Enter<\/strong> key.\u00a0 The\u00a0 radio will return the signal strength of the last packet it received, followed by an OK prompt as shown below:<\/p>\n OK This indicates the last packet of data that the radio received over-the-air had a signal strength of -92dBm.\u00a0<\/p>\n There is a short history buffer in the radio that keeps track of the signal strengh and time of the last few packets.\u00a0 The ATHS<\/strong> command will display a table of the historical packet signal strength and times.\u00a0<\/p>\n The most recent reception is on the bottom of the list.<\/p>\n The above two processes rely upon having received something from another radio.\u00a0 There are cases when a newly installed radio has not yet received any data over the air.\u00a0\u00a0\u00a0 In these cases it may be better to ping a remote radio.\u00a0 You can send a “PING<\/strong>” message out one data radio modem to another.\u00a0 A PING<\/strong> will cause the remote radio to respond with a short PING BACK<\/strong> message that the originating radio modem will receive.\u00a0 Embedded in the PING BACK<\/strong> message is the received signal strength that the remote radio modem received the PING<\/strong> message at.\u00a0<\/p>\n When the originating\u00a0radio modem receives the PING BACK<\/strong>message from the remote radio, it outputs the ID of the remote radio, and the Received Signal Strength (RSSI) that the remote radio read when it received the PING<\/strong> message.<\/p>\n Note, for PING to work the “Remote Access” must be enable on the remote radio.\u00a0 By default it is enabled.\u00a0 The command ATRV 0<\/strong> enables remote access and ATRV 1<\/strong> disables it.<\/p>\n Shown below is an example of how a PING command will look, when a radio modem\u00a0pings unit 0002.<\/p>\n There is a command within the Raveon data radio modem that allows you to read the current RF level on the radio channel.\u00a0 It is the ATRQ<\/strong> command.\u00a0 The moment you issue the ATRQ command, it reads the RF level of any signal on the channel, and reports it back.\u00a0<\/p>\n To be useful, you will probably have to have some other radio transmit continuously or put a signal generator on the radio channel at the moment you issue this command.\u00a0<\/p>\n It is useful for determining if there is a lot of RF interference on the radio channel.\u00a0 A clear interference-free channel will have a noise-floor below -120dBm.\u00a0<\/p>\n <\/span>\u00a0<\/p>\n <\/span><\/p>\n","protected":false},"excerpt":{"rendered":" Raveon wireless modems have a number of ways an installer can verify that the system is working properly.\u00a0 This application note describes how to verify signal strength on Raveon’s VHF and UHF data radio modems.\u00a0\u00a0 Read The Last Recption’s Signal Strength The command ATRSreturns the signal strength (in dBm) of the last message that the […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[38],"tags":[],"_links":{"self":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/550"}],"collection":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/comments?post=550"}],"version-history":[{"count":6,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/550\/revisions"}],"predecessor-version":[{"id":555,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/posts\/550\/revisions\/555"}],"wp:attachment":[{"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/media?parent=550"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/categories?post=550"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.raveon.com\/data_radio_info\/wp-json\/wp\/v2\/tags?post=550"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nATRS
\n-92
\nOK<\/p>\nRead the Reception History<\/h2>\n
OK aths ROM RSSI TIME 0000 0 0 0000 0 0 0000 0 0 0000 0 0 1000 -110 33 0002 -75 45 08EA -99 122 0002 -74 131 OK<\/pre>\n
Ping Another Data Radio Modem<\/h2>\n
ok ping 0002 <RPR> FROM=0002 -74<\/RPR> ok<\/span><\/pre>\nRead the Instantaneous Signal Strength<\/h2>\n