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Thread: Pinout needed for serial ports?

  1. #1
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    Pinout needed for serial ports?

    I have a comtrol Rocketport PCI card that has 8 serial ports on it using RJ11 connectors. Since they had to stuff so many connectors in a small area they had to be RJ11 meaning that there are 2 pins missing (RTS and DSR). I am having trouble with getting some serial items working and there tech support suggested that it could be that the devices are requiring these pins.

    I am trying to hook up a touch controller, car alarm interface and GPS. These items all work fine on my home computer using a standard serial port but I am having trouble getting them working in the car. I understood that transmit, receive and ground are the only important pins. There doesn't seem to be conflicts with the hardware. Any ideas? I would think this thing could run these very basic devices since it was meant for modems and POS terminals etc..

  2. #2
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    I think the two missing pins could be quite important. Pins such as the ready to send pin are usually crosswired with other pins on simple devices, to fool the computer into thinking it's ready to send data. Without them you could have many problems.
    Best regards,
    Matthew

  3. #3
    FLAC cproaudio's Avatar
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    Re: Pinout needed for serial ports?

    Originally posted by Sleeka
    I have a comtrol Rocketport PCI card that has 8 serial ports on it using RJ11 connectors. Since they had to stuff so many connectors in a small area they had to be RJ11 meaning that there are 2 pins missing (RTS and DSR). I am having trouble with getting some serial items working and there tech support suggested that it could be that the devices are requiring these pins.

    I am trying to hook up a touch controller, car alarm interface and GPS. These items all work fine on my home computer using a standard serial port but I am having trouble getting them working in the car. I understood that transmit, receive and ground are the only important pins. There doesn't seem to be conflicts with the hardware. Any ideas? I would think this thing could run these very basic devices since it was meant for modems and POS terminals etc..
    Never had the PCI com ports, try new driver or update the firmware maybe. I'm using a Keyspan USB 4 port serial hub and a CompUSA port replicator. It works perfectly with Xenarc touch screen, IRMan, serial relay control module, Garmin GPS16, OBD-II scanner. I notice they dont work with Cliffnet alarm control though. The alarm has to be plugged into the computer serial port instead. Speaking of alarm control. What alarm do you have that requires serial interface? Clifford or DEI?

  4. #4
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    To verify that your ports are working, take a paperclip and jumper pins 2 & 3 on the DB-9 port. Open a hyperterminal session on the port and see if everything you type is echoed. If it isn't, you've got other issues than DSR and RTS.

    As far as your other issues:

    Request to Send (RTS) and Data Set Ready (DSR) are not usually essential to communication. Some devices require RTS to be logic high before begins to accept requests, but usually you can make a jumper from Clear to Send (CTS) to RTS to accomplish that. DSR is a signal that the terminal (computer) should read, so not being able to access that shouldn't be a problem.

  5. #5
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    There is a program by Control for testing status of a port with a loopback connector. I built this connector and tried it. It fails the test because it is looking for all pins but it is sending and receiving on the TxD and RxD lines just fine. At the time I bought this I did not know of the USB hub versions which is still something I may consider because I really would prefer not using a card.

    Thanks everyone for their advice so quick.

    I have a Clifford Solaris alarm with the Cliffnet wizard interface.

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