FMPx link error = -5?

[leegam]

My old DSD ver 1.101 works fine but I've hit a wall trying to get plus working. I'm using a RTL- 2832 dongle
Downloaded a new copy of Plus. Ran 1r.bat to start and next FMPx-24 cc.bat. program starts I see the spectrum
monitor. But plus always reports a " FMPx link error -5. Can't get past this What gives?

 

[jtwalker]

You ran FMP24-VC ?

 

[mtindor]

My old DSD ver 1.101 works fine but I've hit a wall trying to get plus working. I'm using a RTL- 2832 dongle
Downloaded a new copy of Plus. Ran 1r.bat to start and next FMPx-24 cc.bat. program starts I see the spectrum
monitor. But plus always reports a " FMPx link error -5. Can't get past this What gives?

If you downloaded the new free Public Release version of Fast Lane from the website:

1. download / unarchive the entire contents to a new directory with nothing in it
- good options are c:\dsdplus or c:\dsdpluspublic or c:\users\<username>\desktop\desplus

2. Run FMP24-CC.bat and 1R.bat

You should not have to do anything else. Don't edit any batch files or anything. Just run the two batch files mentioned in step #2.

 

[jtwalker]

You ran FMP24-VC ?

Whoops, I meant to ask if you ran FMP24-CC.bat?

 

[leegam]

You ran FMP24-VC ?

Thanks guys. I installed the public download in a new directory. Ran the 1R bat along with FMP24-CC. Still no link to my dongle. it's an RTL-2832. Next I tried 1r bat along with FMP24-VC. Still no good Finally Ran 1r bat with the FMP-24 application file. The dongle spectrum came up but still got an link error -5 from DSD. Next I shut off windows defender fire wall to see if this worked. No good Finally deleted the DSD-Plus directory power down the computer, powered back up and installed a new copy of DSD. Same results. I intermittently get a prompt on start up that the dongle is in use when starting FMP24-CC. I'm wondering if I should try to do an install on a completely different PC?

 

[gary123]

try editing your FMP24 to this. The no link indicates the DSD program is looking for a different device ID. Change the freq to what you want.

start FMP24 -o7654 -f855.5625 -b12.5 -g42.9
timeout /t 6
call dsdplus -i7654 -v3 -O NUL

 

[dave3825]

Post the contents of your fmp24-cc.bat and 1R.bat. Both ports listed should match. Whether its 20001, 20002 or 7654, they need to match.

Post contents of cmd windows when you start fmp24-cc.bat and dsdplus

C:\Users\Preferred Customer\OneDrive\SDR\DSDPlusFull>FMP24 -rc -i0 -o20001 -P0.0 -f935.0
FMP24 2.86

Current working directory is "C:\Users\Preferred Customer\OneDrive\SDR\DSDPlusFull"
SDR sampling rate = 2.400 MHz
Spectrum window width: 1024
FFT size: 32,768
Spectrum update rate: 10 Hz
Step size table: 5.000 6.250 7.500 12.500 15.000 25.000 100.000
DSD+ path is "C:\Users\Preferred Customer\OneDrive\SDR\DSDPlusFull"
Primary frequency list: '.\FreqList.csv'
Secondary frequency list: '.\FreqList2.csv'
Database search distance: 99.90 miles
Base latitude/longitude: 19.7163 -155.6241
Role is control/rest channel monitor;
Auto-starting control/rest channel following mode
Using first available RTL SDR device
Using DSD+ link ID 20001
PPM correction set to 0.0
Initial frequency set to 935.000000 MHz
Optimizing FFT calculations... done.

Audio output device #1 = 'Panasonic-TV (Intel(R) Display '
Audio output device #2 = 'Line 6 (Virtual Audio Cable)'
Audio output device #3 = 'Line 4 (Virtual Audio Cable)'
Audio output device #4 = 'Line 1 (Virtual Audio Cable)'
Audio output device #5 = 'Line 2 (Virtual Audio Cable)'
Audio output device #6 = 'Line 5 (Virtual Audio Cable)'
Audio output device #7 = 'Line 7 (Virtual Audio Cable)'
Audio output device #8 = 'Line 3 (Virtual Audio Cable)'

SDR device count = 2
SDR device #1 is in use
SDR device #2 serial string = '00000001'
Found Rafael Micro R820T tuner
Found Rafael Micro R820T tuner
Tuner type=5 (R820T)
Serial string = '00000001'
Sampling rate set to 2.400000 MHz

C:\Users\Preferred Customer\OneDrive\SDR\DSDPlusFull>DSDPlus -r1 -i20001 1>>1R-log.txt
2026.01.21 16:58:41
2026.01.21 16:58:41 DSD+ 2.547
2026.01.21 16:58:41 Current working directory is "C:\Users\Preferred Customer\OneDrive\SDR\DSDPlusFull"
2026.01.21 16:58:41 Program role is single-receiver control/rest/traffic channel decoder
2026.01.21 16:58:41 Appending synthesized audio to file '1R-DSDPlus.wav'
2026.01.21 16:58:41
2026.01.21 16:58:41 Assuming FMPA/FMPP/FMP24 is signal source; auto polarity detect is disabled
2026.01.21 16:58:41
2026.01.21 16:58:41 audio output device #1 = 'Panasonic-TV (Intel(R) Display '
2026.01.21 16:58:41 audio output device #2 = 'Line 6 (Virtual Audio Cable)'
2026.01.21 16:58:41 audio output device #3 = 'Line 4 (Virtual Audio Cable)'
2026.01.21 16:58:41 audio output device #4 = 'Line 1 (Virtual Audio Cable)'
2026.01.21 16:58:41 audio output device #5 = 'Line 2 (Virtual Audio Cable)'
2026.01.21 16:58:41 audio output device #6 = 'Line 5 (Virtual Audio Cable)'
2026.01.21 16:58:41 audio output device #7 = 'Line 7 (Virtual Audio Cable)'
2026.01.21 16:58:41 audio output device #8 = 'Line 3 (Virtual Audio Cable)'
2026.01.21 16:58:41
2026.01.21 16:58:41 audio output device #1 (Panasonic-TV (Intel(R) Display ) initialized
2026.01.21 16:58:41
2026.01.21 16:58:41
2026.01.21 16:58:41 Testing Base Files:
2026.01.21 16:58:41
2026.01.21 16:58:41 File: FMP24.exe PASS
2026.01.21 16:58:41 File: FMPA.exe PASS
2026.01.21 16:58:41 File: FMPP.exe PASS
2026.01.21 16:58:41 File: FMP-Map.exe PASS
2026.01.21 16:58:41 File: LRRP.exe PASS
2026.01.21 16:58:41 File: Survey.exe PASS
2026.01.21 16:58:41 File: airspy.dll PASS
2026.01.21 16:58:41 File: lame_enc.dll PASS
2026.01.21 16:58:41 File: libfftw3f-3.dll PASS
2026.01.21 16:58:41 File: libusb-1.0.dll PASS
2026.01.21 16:58:41 File: msvcr90.dll PASS
2026.01.21 16:58:41 File: msvcr100.dll PASS
2026.01.21 16:58:41 File: msvcrt.dll PASS
2026.01.21 16:58:41 File: pthreadVCE2.dll PASS
2026.01.21 16:58:41 File: rtlsdr.dll PASS
2026.01.21 16:58:41 File: rtlsdr_FC0012.dll PASS
2026.01.21 16:58:41 File: rtlsdr_V4.dll PASS
2026.01.21 16:58:41 File: sdrplay_api.dll PASS
2026.01.21 16:58:41
2026.01.21 16:58:41 18 files checked
2026.01.21 16:58:41 18 files passed
2026.01.21 16:58:41
2026.01.21 16:58:41 Base files test: All files passed
2026.01.21 16:58:41 P25 data loaded; 6 networks, 17 sites, 54 channels
2026.01.21 16:58:41 0 frequency records loaded
2026.01.21 16:58:41 0 network records loaded
2026.01.21 16:58:41 0 site records loaded
2026.01.21 16:58:41 94 radio records loaded
2026.01.21 16:58:41 76 group records loaded
2026.01.21 16:58:41 Fusion decoding enabled
2026.01.21 16:58:41 D-STAR decoding enabled
2026.01.21 16:58:41 NXDN4800 decoding enabled
2026.01.21 16:58:41 NXDN9600 decoding enabled
2026.01.21 16:58:41 DMR/MotoTRBO decoding enabled
2026.01.21 16:58:41 0 site loader records loaded
2026.01.21 16:58:41 P25 Phase 1 and Phase 2 decoding enabled
2026.01.21 16:58:41 X2-TDMA decoding enabled
2026.01.21 16:58:41 ProVoice decoding enabled

Mono audio decoding initiated...
2026.01.21 16:58:41 Initiating FMPx link using link ID 20001...
2026.01.21 16:58:41 FMPx link established; link ID = 20001
2026.01.21 16:58:41 FMPx link established

 

[leegam]

Post the contents of your fmp24-cc.bat and 1R.bat. Both ports listed should match. Whether its 20001, 20002 or 7654, they need to match.

Post contents of cmd windows when you start fmp24-cc.bat and dsdplus

I'll check that out. I'll let you know how it goes.

 

[leegam]

Here's the text of 1R . bat,
DSDPlus -r1 -i20001 >>1rlog.txt

The text of FMP24-cc has the following text.

FMP24 -rc -i1 -o20001 -p0.0 -f935.0

Still no luck It seems these files won't link up. I occasionally get a prompt that the sdr is already in use. But no other program is running.

 

[dave3825]

Next I shut off windows defender fire wall to see if this worked.

Do you have any other firewall/antivirus software?

Was Zadig originally used on the dongle?

I intermittently get a prompt on start up that the dongle is in use when starting FMP24-CC

How often?

Can you post the contents of the cmd screens for Fmp24 and DSDplus, like what referenced above in post 7?

 

[mtindor]

Here's the text of 1R . bat,
DSDPlus -r1 -i20001 >>1rlog.txt

The text of FMP24-cc has the following text.

FMP24 -rc -i1 -o20001 -p0.0 -f935.0

Still no luck It seems these files won't link up. I occasionally get a prompt that the sdr is already in use. But no other program is running.

Screenshots. Screenshots. When this behavior is being exhibited, provide screenshots of the FMP24-CC command window and DSDPlus command window (ya know, what look to be DOS prompt windows). You simply aren't providing useful information for anyone to help you.

Use a pristine download (where you haven't edited ANYTHING). Run FMP24-CC.bat and 1R.bat. Take screenshots and attach them to a reply.

Your DSDPlus cannot communicate with your FMP24 because either you edited batch files and it's trying to connect to the wrong device, or because your device cannot be found and FMP24 won't stay running.

I'd recommend that you redo Zadig (I run it with admin privileges) using the instructions below:

https://unitrunker.com/fga-zadig.html

 

[leegam]

Here's the code of 1r bat.

DSDPlus -r1 -i20001 >>1R-log.txt



Here's the code of FMP-cc

FMP24 -rc -i1 -o20001 -P0.0 -f935.0

As far as deleting the old copy and directory, been there and done that along with running the files as administrator.

 

[mtindor]

Here's the code of 1r bat.

DSDPlus -r1 -i20001 >>1R-log.txt



Here's the code of FMP-cc

FMP24 -rc -i1 -o20001 -P0.0 -f935.0

As far as deleting the old copy and directory, been there and done that along with running the files as administrator.

Start FMP24-CC.bat (and only FMP24-CC.bat). Take a screenshot of the command prompt (black window) after you have run FMP24-CC.bat. Allow us to see precisely what is being reported.

 

[dave3825]

Does your FMP24 come up, stay on the screen, and look like similar to this?

As far as deleting the old copy and directory, been there and done that along with running the files as administrator.

What version of Windows are you running? Never had to run any DSDPlus files as an administrator.

Next I shut off windows defender fire wall to see if this worked.

Do you have any other firewall/antivirus software?

Do you have any additional antivirus/firewall software on the PC?

1. download / unarchive the entire contents to a new directory with nothing in it
- good options are c:\dsdplus or c:\dsdpluspublic or c:\users\<username>\desktop\desplus

I installed the public download in a new directory

Finally deleted the DSD-Plus directory power down the computer, powered back up and installed a new copy of DSD.

Did you follow the directory location advise @mtindor posted? Where is the new directory located? Don't see any mention of where you installed it.

Start FMP24-CC.bat (and only FMP24-CC.bat). Take a screenshot of the command prompt (black window) after you have run FMP24-CC.bat. Allow us to see precisely what is being reported.

Asked in posts 7, 10 and 13. Can you post the screenshots?