The monitoring PC "Sees" on its serial port both sides of the serial conversation - that is it receives what is sent by the target PC and also what is sent by target peripheral.
Given the cable that I believe will work, connect the cable, LED box and two devices all together. Normally, other cabling problems will involve handshake lines. The reliable solution is to loop back the handshake lines if they are not used.
The hookup thing to remember, is that there is a hookup chance the two devices you are trying together will actually work if you can get the cable correct.
The particular requirements for different equipment may vary. Allen Bradley PLC getting connected type k thermocouple record interfaces windows software yost serial device wiring standard see historical note conflicting pinouts below here scheme which solves four six rs hassles tol bus pirate v3.
An LED box will be an invaluable guide, but there is no trivial test to determine the solution. Depending on the signal state it hookup sometimes work, other times it might not.
And don't use a Null Modem cable between the PC and switch. The matching signal from the other end is DSR - this is active when the other equipment is also ready to operate.
Two of them are connected straight through - plug them in series with the devices you wish to monitor - and the third goes off to a seperate PC for monitoring the communications. While the normal PC hardware might well run with just Tx, Rx and Ground connected, most driver software will wait forever for one of the handshaking lines to go to the correct level.
The gadget below is a quick half hour project that is really great for monitoring RS Comms using a PC. I've seen several references here on the board about problems occurring from using a USB to serial adapter.
In stock, fast shipping! Power the devices on and make a note of which LEDs are lit. Smith serial products rs rs rs authority converters, repeaters, microprocessors, fiber optics, ethernet port cables more.
This device is surprisingly successful in operation, and works to successfully record RS protocols for many different installs - mostly because many supposedly full duplex installations still talk half duplex in any case, because that is the sensible way to write the software. We are trying to flatten the learning curve: All in all, Not bad for one diode and a resistor Part way through a transmission, the other device may send CTS inactive this is interpreted as "stop sending for now".
Mark on the cables and using stickers on the boxes or you are really messed up. There is more than one way to wire up a loopback plug - but this is the most common.
Some serial protocols, however, talk "full duplex" meaning that one end can start transmitting while it is still receiving from its peer. This is the second of two unpaired handshake lines.
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