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For anyone Considering buying a Lanronix MSS-100 or other device from Lantronix

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    Originally posted by SkydivinGirl View Post
    Someone on Lemon64 made a guide for the MSS-100 configuration. There are also links in the post to configuration settings that I use. They will probably answer all your questions.

    Good luck! Feel free to send me a PM if you have any other questions.

    For the last 2 months or so, I've been messing with this MSS100 on the weekends & getting no where. I've followed that walkthrough you suggested, actually had done so previously, prior to posting. I don't understand why I can't get any data across the serial connection. I am using multiple cables, as I previously stated, all of which give me no results. I have reviewed numerous documents on configuring the MSS100 device, I've reset it to factory defaults, gone through the configuration, & am using multiple computers & multiple cables that I can use other serial devices such as modems without any issue. At what point is it safe to assume this thing is defective, & I wind up dumping more money into another one?

    Currently I have a USB->Serial adapter on Linux, I've used minicom, syncterm, & cu to attempt to connect, each time power cycling the lantronics & re-configuring the USB->Serial adapter to avoid any configuration or lock-creep.

    Local> show port

    Port 1: Username: Port_1 Physical Port 1 (Idle)
    Char Size/Stop Bits: 8/1 Baud Rate: 9600
    Flow Ctrl: None Session Limit: 4
    Parity: None Modem Control: None
    Access: Remote Break Ctrl: Remote
    Local Switch: None
    Forward: None Backward: None
    Port name: Port_1 Terminal Type: None
    Autostart char(s): --/-- Datasend char(s): --/--
    Save chars (AS/DS): none/none Timer: (none)
    Dedicated Service: TCP:

    Characteristics: Autobaud DSR Logout Telnet Pad Dtrwait

    Sessions: 0 Current Session: None
    Input/Output Flow Ctrl: N/N DSR/DTR/CTS/RTS/CD: N/N/N/Y/N

    Seconds Since Zeroed: 208 Framing Errors: 0
    Accesses Local/Rem: 0/0 Parity Errors: 0
    Flow Control Violations: 0 Overrun Errors: 0
    Bytes Input: 0 Bytes Output: 0
    Input Flow On/Off: 0/ 0 Output Flow On/Off: 0/ 0

    I am initializing on Linux with :
    stty -F /dev/ttyUSB0 9600 -cstopb -ixon -ixoff -crtscts -parenb echo
    Reviewing with stty -a -F /dev/ttyUSB0 gives the following :

    speed 9600 baud; rows 0 columns 0; line = 0;
    intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>;
    eol2 = <undef>; switch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R;
    werase = ^W; lnext = ^V; flush = ^O; min = 1; time = 1;
    -parenb -parodd -cmspar cs8 hupcl -cstopb cread clocal crtscts
    ignbrk -brkint ignpar -parmrk -inpck -istrip -inlcr -igncr -icrnl -ixon -ioff
    -iuclc -ixany -imaxbel -iutf8
    -opost -olcuc -ocrnl -onlcr -onocr -onlret -ofill -ofdel n10 cr0 tab0 bs0 vt0 ff0
    -isig -icanon -iexten -echo -echoe -echok -echonl -noflsh -xcase -tostop -echoprnt
    -echoctl -echoke

    The reason that I'm using Linux is this gives me the most troubleshooting information, & the most control over the device. The DOS machine that I intend to use this on leaves me blind, only wondering why I get init failed back. I have yet to find a way to "initialize" the mss100 as a modem, & successfully issue AT commands to it. I'm kind of at my wits end with this... as the serial port is giving me nothing out, yet the tcp/ip side has been working fine from day one. It's incredibly frustrating as nothing I'm doing is giving me any indication of life (other than RING when telnet in, & sending ATA does nothing), despite following walkthroughs of others getting it to work. However, of the walkthroughs I'm following, these people are using 8bit Atari/C64 machines, & not 16bit DOS. Does this matter for RS232? I would think not, but what about the pinouts? Just so many inconsistencies, & all I know is that it's not communicating.

    Just to add to the cable confusion :

    6: Troubleshooting
    --The MSS completes its power-up and boot procedures, but there's no noticeable serial activity.
    --Check the terminal setup and the physical connections, including the cable pinouts (see Pinouts). Try another serial device or cable, or cycle power on the MSS.

    Then under section 7 is the pinout diagrams. I'm trying to compare those pinouts vs what would be in a generic null modem cable referencing here :
    Last edited by no2pencil; November 22, 2015, 02:14 PM.


      It sounds like you've done about everything that you can. I'd be happy to test it for you if you like but it wouldn't be worth the cost by the time you sent it here and I sent it back. Probably best to pick up another one.

      Good luck,



        Ive gotten back into connecting the Lantronix MSS-100 and have written a sorta-user friendly HOW-TO here:

        Happy BBSing!
        Currently Looking for Samsung Sens Pro Laptop's (500, 520,800,820) and accessories, specifically a docking station.


          Just to follow up on this thread with my resolution, it was a cabling issue. I currently have WAFFLE working on DOS taking telnet OR dialup. Currently working on getting multiple com ports configured.

          Thank you (SkydivinGir)SO MUCH for your picture example walkthroughs of configuration for the LANTRONIX MSS 100