vfs11 VFD and USB001Z usb interface

Hi,
someone use vfs11 VFD driver and the USB001Z (original?)
I loaded the usb driver using the command
modprobe ftdi_sio vendor=0x0403 product=0xe040

but whene the hal driver is loading I got the error:
ERROR: modbus_rtu_set_serial_mode(0)

Looking into the source (git.linuxcnc.org/gitweb?p=linuxcnc.git;a...a5;hb=refs/heads/2.6) it seems it has problem with the USB interface, I get the same error even if I disconnect the rj45 cable from the VFD.

Someone can share his experience with this configuration?

Hi,
I recompiled libmodbus 3.1.2 and I'm using the custom interface on breadboard.
I also setup all debug information and I have continuously the errors below:

ERROR CRC received 0x80 != CRC calculated 0x70A0
vfs11_vfd: read_initial: modbus_read_registers(0x0012): Invalid CRC
write_data: cmd1_reg=0xC440 old cmd1_reg=0x0000
[00][06][FA][00][C4][40][EB][F3]
Waiting for a confirmation...
<00><00><00><00><00>
ERROR CRC received 0x0 != CRC calculated 0x71C0
[00][03][00][12][00][01][25][DE]
Waiting for a confirmation...
<00><02><00><00><80>
ERROR CRC received 0x80 != CRC calculated 0x70A0
vfs11_vfd: read_initial: modbus_read_registers(0x0012): Invalid CRC
write_data: cmd1_reg=0xC440 old cmd1_reg=0x0000
[00][06][FA][00][C4][40][EB][F3]
Waiting for a confirmation...
<00><00><00><00><00>
ERROR CRC received 0x0 != CRC calculated 0x71C0
[00][03][00][12][00][01][25][DE]
Waiting for a confirmation...
<00><02><00><12><E0>
ERROR CRC received 0x12E0 != CRC calculated 0x70A0
vfs11_vfd: read_initial: modbus_read_registers(0x0012): Invalid CRC
write_data: cmd1_reg=0xC440 old cmd1_reg=0x0000
[00][06][FA][00][C4][40][EB][F3]
Waiting for a confirmation...
<00><00><00><00><00>
ERROR CRC received 0x0 != CRC calculated 0x71C0
[00][03][00][12][00][01][25][DE]
Waiting for a confirmation...
<00><00><00><FA><00>
ERROR CRC received 0xFA00 != CRC calculated 0x71C0
vfs11_vfd: read_initial: modbus_read_registers(0x0012): Invalid CRC
write_data: cmd1_reg=0xC440 old cmd1_reg=0x0000
[00][06][FA][00][C4][40][EB][F3]
Waiting for a confirmation...
<00><04><02><00><04><FE><00>
ERROR CRC received 0xFE00 != CRC calculated 0x8533
[00][03][00][12][00][01][25][DE]
Waiting for a confirmation...

Now I'm pretty sure that driver is connected because if I disconnect the cable I get connection timeouts.
Any idea?