3.0 Connects to Printer, 3.1 Does Not

[mrunion]

I have changed nothing on the printer firmware (A RepRap Replikeo Prusa I3). I have both software versions (3.0 and 3.1) installed. 3.0 will connect to my printer via USB in the Machine Control Panel. The same printer on the same computer on the same USB port will NOT connect to the printer in the 3.1 version. I am using Arch Linux 64-bit. The printer is on port /dev/ttyUSB0 at a 115200 baud rate on both 3.0 and 3.1. Here is a snippet of the output on a successful 3.0 connection and an unsuccessful 3.1 connection:

Successful 3.0 version

Code: Select all

Attempting connection at /dev/ttyUSB0...
RECEIVED: XSß%âÒ~TÀÂéؼqCµ‚zx ’)miSPcJstart
RECEIVED: echo:Marlin 1.1.0-RC3
RECEIVED: echo: Last Updated: 2015-12-01 12:00 | Author: Replikeo i3 Dual
RECEIVED: Compiled: Jan 23 2016
RECEIVED: echo: Free Memory: 3105  PlannerBufferBytes: 1232
RECEIVED: echo:Hardcoded Default Settings Loaded
RECEIVED: echo:Steps per unit:
RECEIVED: echo:  M92 X80.00 Y80.00 Z4000.00 E425.00
RECEIVED: echo:Maximum feedrates (mm/s):
RECEIVED: echo:  M203 X500.00 Y500.00 Z2.00 E25.00
RECEIVED: echo:Maximum Acceleration (mm/s2):
RECEIVED: echo:  M201 X2000 Y2000 Z20 E1000
RECEIVED: echo:Accelerations: P=printing, R=retract and T=travel
RECEIVED: echo:  M204 P3000.00 R3000.00 T3000.00
RECEIVED: echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s),  Z=maximum Z jerk (mm/s),  E=maximum E jerk (mm/s)
RECEIVED: echo:  M205 S0.00 T0.00 B20000 X15.00 Z0.40 E5.00
RECEIVED: echo:Home offset (mm):
RECEIVED: echo:  M206 X0.00 Y0.00 Z0.00
RECEIVED: echo:Material heatup parameters:
RECEIVED: echo:  M145 M0 H180 B65 F255
RECEIVED: echo:  M145 M1 H240 B100 F255
RECEIVED: echo:PID settings:
RECEIVED: echo:  M301 P22.20 I1.08 D114.00 C100.00 L20
RECEIVED: echo:Filament settings: Disabled
RECEIVED: echo:  M200 D3.00
RECEIVED: echo:  M200 T1 D3.00
RECEIVED: echo:  M200 D0
RECEIVED: echo:Z-Probe Offset (mm):
RECEIVED: echo:  M851 Z-0.25
  Testing plaintext communication protocol...
  Testing binary communication protocol...
RECEIVED: echo:SD init fail
RECEIVED: ok
  Connected to machine!
SENT: T0
WARNING: CRC mismatch detected
RECEIVED: 
SENT: M105
RECEIVED: ok T:20.5 /0.0 B:23.1 /0.0 T0:20.5 /0.0 T1:20.6 /0.0 @:0 B@:0

Unsuccessful 3.1 version

Code: Select all

Attempting connection at /dev/ttyUSB0...
READ: á‚Üxáx˜Ø›ÄGO8”€Dm0z.2YÁ›2•Q8BJstart
READ: echo:Marlin 1.1.0-RC3
READ: echo: Last Updated: 2015-12-01 12:00 | Author: Replikeo i3 Dual
READ: Compiled: Jan 23 2016
READ: echo: Free Memory: 3105  PlannerBufferBytes: 1232
READ: echo:Hardcoded Default Settings Loaded
READ: echo:Steps per unit:
READ: echo:  M92 X80.00 Y80.00 Z4000.00 E425.00
READ: echo:Maximum feedrates (mm/s):
READ: echo:  M203 X500.00 Y500.00 Z2.00 E25.00
READ: echo:Maximum Acceleration (mm/s2):
READ: echo:  M201 X2000 Y2000 Z20 E1000
READ: echo:Accelerations: P=printing, R=retract and T=travel
READ: echo:  M204 P3000.00 R3000.00 T3000.00
READ: echo:Advanced variables: S=Min feedrate (mm/s), T=Min travel feedrate (mm/s), B=minimum segment time (ms), X=maximum XY jerk (mm/s),  Z=maximum Z jerk (mm/s),  E=maximum E jerk (mm/s)
READ: echo:  M205 S0.00 T0.00 B20000 X15.00 Z0.40 E5.00
READ: echo:Home offset (mm):
READ: echo:  M206 X0.00 Y0.00 Z0.00
READ: echo:Material heatup parameters:
READ: echo:  M145 M0 H180 B65 F255
READ: echo:  M145 M1 H240 B100 F255
READ: echo:PID settings:
READ: echo:  M301 P22.20 I1.08 D114.00 C100.00 L20
READ: echo:Filament settings: Disabled
READ: echo:  M200 D3.00
READ: echo:  M200 T1 D3.00
READ: echo:  M200 D0
READ: echo:Z-Probe Offset (mm):
READ: echo:  M851 Z-0.25
  Testing plaintext communication protocol...
  Testing binary communication protocol...
READ: echo:SD init fail
READ: ok
  Testing alternate communication protocols...
WARNING: CRC mismatch detected
READ: 
  Attempting RTS reset and trying again...
  Connection failed.

Any assistance in this matter would be helpful.

[CompoundCarl]

Neither of those actually look "successful" in my opinion. Both of them look like the printer is either taking too long to respond and, if it does connect, it seems more like chance than anything. I think your best bet would be to go to Tools > Firmware Configuration, Communication tab, and disable the "wait for startup" option.

[mrunion]

I will try that, thanks!

Also, I was finally able to get the 3.1 version of the software to connect to the printer when I switched to using a USB 3.0 port instead of a 2.0 port. Odd, huh?!?

But I will try your tip and see what happens.