Andy,
"Polling" normally refers to a situation like Ethernet and others where
a response from a particular *addressed* device is requested.
For RS-232, it is "handshaking" (if implemented) telling the DTE when it
is OK to send data - since there is only one transmitter on an RS-232
signalling line, there is no need for addressing. The transmitting
device expects to communicate to only one receiving device on the other
end (although other receivers can 'listen in'.
I have worked with RS-232 for over 35 years both professionally (both
modems and DCEs for 20 years) and with ham radio gear and PCs after
retirement from that life.
If we wish for clear communication, the terms used are important. Ham
Radio "speak" often confuses the proper engineering terms. You hear of
ham radio software that "polls" the radio - in reality, it is simply
issuing a command to the radio and expects a response to that command.
That is a command/response scenerio, and is not really polling.
Don W3FPR
On 2/11/2019 3:55 PM, Andy Durbin wrote:
"I have no idea how your "polling" device works, but with RS-232,
thereis no polling, "
Point 1 is true. Point 2 is, in my opinion, not true.
A poll is a request for information. The device issuing the
poll/request is the polling device. For example, sending IF; to a
TS-590 is a data request, or poll, for the current IF status. The
TS-590 responds with the full IF word.
Andy, k3wyc
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