The error string is also suspicious.. *IDN? is a command used to identify lab instruments that implement SCPI protocols, and I’m not familiar with any GPS receiver that interfaces using SCPI. Is it possible you have some kind of instrument-control service on your computer (LabView, Keysight IO, etc) which is trying to talk to the USRP as if it were a lab instrument?
From: Marcus D. Leech <patchvonbr...@gmail.com> Sent: Wednesday, June 1, 2022 12:43 PM To: usrp-users@lists.ettus.com Subject: [USRP-users] Re: GPS invalid reply On 2022-06-01 11:19, gokul sani wrote: Dear USRP Community, I am using usrp b210 with gpsdo. But "uhd_usrp_probe" gave me an error. --[ERROR] [GPS] GPS invalid reply "scpi > *IDN? The gps antenna is tested with a different b210 and received the lock. last week, it was working fine. No apparent changes were made.! Please provide any insights of yours. uhd_usrp_probe [INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800; UHD_3.15.0.HEAD-0-gaea0e2de [INFO] [B200] Loading firmware image: /usr/local/share/uhd/images/usrp_b200_fw.hex... [INFO] [B200] Detected Device: B210 [INFO] [B200] Loading FPGA image: /usr/local/share/uhd/images/usrp_b210_fpga.bin... [INFO] [B200] Operating over USB 3. [INFO] [B200] Detecting internal GPSDO.... [ERROR] [GPS] GPS invalid reply "scpi > *IDN? ", assuming none available [INFO] [GPS] No GPSDO found [INFO] [B200] Initialize CODEC control... [INFO] [B200] Initialize Radio control... [INFO] [B200] Performing register loopback test... [INFO] [B200] Register loopback test passed [INFO] [B200] Performing register loopback test... [INFO] [B200] Register loopback test passed [INFO] [B200] Setting master clock rate selection to 'automatic'. [INFO] [B200] Asking for clock rate 16.000000 MHz... [INFO] [B200] Actually got clock rate 16.000000 MHz. _____________________________________________________ / | Device: B-Series Device | _____________________________________________________ | / .. . .. Thank you, Gokul _______________________________________________ USRP-users mailing list -- usrp-users@lists.ettus.com<mailto:usrp-users@lists.ettus.com> To unsubscribe send an email to usrp-users-le...@lists.ettus.com<mailto:usrp-users-le...@lists.ettus.com> You could try carefully re-seating your GPSDO module. Is this module one supplied by Ettus or an after-market one?
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