[Elecraft] KPA500 serial interfaces

The KPA500 has two serial ports. One is assigned to PC and the other to transceiver.I'm aware that all the commands in the Programmer's Reference can be used over the PC port and have been using this interface for about a year for my data logger. Does the transceiver port also support the

[Elecraft] KPA500 serial interfaces

"The talk of sharing connections with boxes that multiplex over an RS232  connection led me to find the products that speak SDLC to a device that then communicates with a set of RS232 devices. I hardly think that is the same thing, since although a single RS232 is required on the computer, it is

Re: [Elecraft] KPA500 serial interfaces

No. The transceiver port is meant to receive data from a connected Elecraft or Kenwood transceiver. It acts on data responses received from those devices. Specifically, it is looking of the following command responses from the transceiver: FA;, FB;, FR;, FT;, or IF;. The entire purpose of the XC

Re: [Elecraft] KPA500 serial interfaces

k3wyc From: Jack Brindle Sent: Saturday, February 9, 2019 10:39 AM To: Andy Durbin Cc: elecraft@mailman.qth.net Subject: Re: [Elecraft] KPA500 serial interfaces No. The transceiver port is meant to receive data from a connected Elecraft or Kenwood transceiver. It acts on data resp

Re: [Elecraft] KPA500 serial interfaces

On Sat, Feb 9, 2019 at 10:51 AM Andy Durbin wrote: > Thanks Jack. I suspected that would be the case but it was better to ask > than to waste my time experimenting.I'll just have to put a bit more > thought into how to configure the KPA500 polling devices and the associated > serial data mul

Re: [Elecraft] KPA500 serial interfaces

"The Serial Box (S-BOX) was specifically designed to make it easy to connect multiple devices in parallel to any transceiver's serial port, including a PC, KPA500, KAT500, KPA1500, SteppIR Controller, Kessler AT-Auto, Shackmaster SM-8, etc. " My configuration requires o

Re: [Elecraft] KPA500 serial interfaces

Andy, You are dealing with an RS-232 communications protocol, which is only point to point and not multipoint like Ethernet. I have no idea how your "polling" device works, but with RS-232, there is no polling, it is direct "handshaking" between 2 devices, a DTE and a DCE. If handshaking is

Re: [Elecraft] KPA500 serial interfaces

"I have no idea how your "polling" device works, but with RS-232, there is 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 reques

Re: [Elecraft] KPA500 serial interfaces

I think the point is that RS-232 does not, as a protocol, support polling. Nothing prevents you from doing some sort of polling programmatically. However, multiple devices on a single RS-232 line is beyond what the protocol was designed for. That's why there is RS-485 - which IS designed for mu

Re: [Elecraft] KPA500 serial interfaces

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

Re: [Elecraft] KPA500 serial interfaces

Not wishing to get into an argument but consider Binary-Synch, Uniscope or UTS400 protocols. They are poll and response, RS232c communications systems. Used from mainframe to (dumb) terminal. They are synchronous RS232 of course rather than asynch and so use the clock and other signals ignored b

Re: [Elecraft] KPA500 serial interfaces

Andy, in support of your comments I was an active Bell System DATEC representative back in the 70s and 80s and multipoint polled RS-232 was very common here in the colonies :) Michael Blake k9...@mac.com > On Feb 11, 2019, at 4:54 PM, Andy McMullin wrote: > > No

Re: [Elecraft] KPA500 serial interfaces

I always worry about what I don't know with this kind of discussion that seems to dive into entrenched positions of pedantic certainty. Since I love my KX3 and other Elecraft products, as well as various microcontrollers, I was concerned that I'd missed something about RS232 which I've used for dec

Re: [Elecraft] KPA500 serial interfaces

As is often the case on reflectors, things often drift of the main topic. RS232, 422. , and RS485 are among a number of electrical specifications that permits the transmission of serial data. While each has certain inherent limitations due to the electrical specification, it is really how the so