I have two B200s, each possessing it's own GPSDO device. Each board has been tested independently and it has been verified that the gpsdo of each device is working. The problem arises when both are plugged into the system at the same time. This is when the utilities used to query those devices are only able to recognize one of the gpsdo devices on one of the boards and claims that the other board does not have a GPSDO device attached. This error has the possibility of being intentional to prevent a conflict in the event the response is different from each device.
I have tried to reset the devices and installed the most recent firmware on both boards. The documentation provided on this site has also been reviewed to see if more information could be gathered on the problem.
Here is the output recieved from probing both devices:
## Device 1
_____________________________________________________
/
| Device: B-Series Device
| _____________________________________________________
| /
| | Mboard: B200
| | serial: XXXXXXXX
| | name: XXXXXXXX_1
| | product: XXXXXXXXX
| | revision: 4
| | FW Version: 8.0
| | FPGA Version: 16.0
| |
| | Time sources: none, internal, external, gpsdo
| | Clock sources: internal, external, gpsdo
| | Sensors: ref_locked
| | _____________________________________________________
| | /
| | | RX DSP: 0
| | |
| | | Freq range: -8.000 to 8.000 MHz
| | _____________________________________________________
| | /
| | | RX Dboard: A
| | | _____________________________________________________
| | | /
| | | | RX Frontend: A
| | | | Name: FE-RX2
| | | | Antennas: TX/RX, RX2
| | | | Sensors: temp, rssi, lo_locked
| | | | Freq range: 50.000 to 6000.000 MHz
| | | | Gain range PGA: 0.0 to 76.0 step 1.0 dB
| | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz
| | | | Connection Type: IQ
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | RX Codec: A
| | | | Name: B200 RX dual ADC
| | | | Gain Elements: None
| | _____________________________________________________
| | /
| | | TX DSP: 0
| | |
| | | Freq range: -8.000 to 8.000 MHz
| | _____________________________________________________
| | /
| | | TX Dboard: A
| | | _____________________________________________________
| | | /
| | | | TX Frontend: A
| | | | Name: FE-TX2
| | | | Antennas: TX/RX
| | | | Sensors: temp, lo_locked
| | | | Freq range: 50.000 to 6000.000 MHz
| | | | Gain range PGA: 0.0 to 89.8 step 0.2 dB
| | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz
| | | | Connection Type: IQ
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: A
| | | | Name: B200 TX dual DAC
| | | | Gain Elements: None
# Device 2
_____________________________________________________
/
| Device: B-Series Device
| _____________________________________________________
| /
| | Mboard: B200
| | serial: XXXXXXXX
| | name: XXXXXXXXXX_2
| | product: XXXXXXXX
| | revision: 4
| | FW Version: 8.0
| | FPGA Version: 16.0
| |
| | Time sources: none, internal, external, gpsdo
| | Clock sources: internal, external, gpsdo
| | Sensors: ref_locked
| | _____________________________________________________
| | /
| | | RX DSP: 0
| | |
| | | Freq range: -8.000 to 8.000 MHz
| | _____________________________________________________
| | /
| | | RX Dboard: A
| | | _____________________________________________________
| | | /
| | | | RX Frontend: A
| | | | Name: FE-RX2
| | | | Antennas: TX/RX, RX2
| | | | Sensors: temp, rssi, lo_locked
| | | | Freq range: 50.000 to 6000.000 MHz
| | | | Gain range PGA: 0.0 to 76.0 step 1.0 dB
| | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz
| | | | Connection Type: IQ
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | RX Codec: A
| | | | Name: B200 RX dual ADC
| | | | Gain Elements: None
| | _____________________________________________________
| | /
| | | TX DSP: 0
| | |
| | | Freq range: -8.000 to 8.000 MHz
| | _____________________________________________________
| | /
| | | TX Dboard: A
| | | _____________________________________________________
| | | /
| | | | TX Frontend: A
| | | | Name: FE-TX2
| | | | Antennas: TX/RX
| | | | Sensors: temp, lo_locked
| | | | Freq range: 50.000 to 6000.000 MHz
| | | | Gain range PGA: 0.0 to 89.8 step 0.2 dB
| | | | Bandwidth range: 200000.0 to 56000000.0 step 0.0 Hz
| | | | Connection Type: IQ
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: A
| | | | Name: B200 TX dual DAC
| | | | Gain Elements: None
And here is an example of the error I am recieving.
sudo ./query_gpsdo_sensors --args name=usrp_dev1
Creating the USRP device with: name=usrp_dev1,clock_source=gpsdo,time_source=gpsdo...
[INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_108300; UHD_4.7.0.0-84-gbdada1ed
[INFO] [B200] Detected Device: B200
[INFO] [B200] Operating over USB 3.
[INFO] [B200] Initialize CODEC control...
[INFO] [B200] Initialize Radio control...
[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.
Using Device: Single USRP:
Device: B-Series Device
Mboard 0: B200
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: FE-RX2
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: FE-TX2
gps_locked sensor not found. This could mean that you have not installed the GPSDO correctly.
Visit one of these pages if the problem persists:
* N2X0/E1X0: http://files.ettus.com/manual/page_gpsdo.html
* X3X0: http://files.ettus.com/manual/page_gpsdo_x3x0.html
