Huanyang GT Series VFD Issues

halrun
loadusr -W hy_gt_vfd -d /dev/ttyUSB0 -p none -r 38400 -s 1 -t 1 -S1410 -F60 -f10

twopass:pass0: loadusr -W hy_gt_vfd -d /dev/ttyUSB0 -p none -r 38400 -s 1 -t 1 -S1410 -F60 -f10
hy_gt_vfd: device='/dev/ttyUSB0', baud=38400, parity='N', bits=8, stopbits=1, address=1
read_modbus_register: error reading freq-fb (register 0x3000): Connection timed out
read_modbus_register: error reading freq-fb (register 0x3000): Connection timed out
read_modbus_register: error reading freq-fb (register 0x3000): Connection timed out
...
set_motor_off: error writing 5 to register 0x1000: Connection timed out
set_motor_off: error writing 5 to register 0x1000: Connection timed out
set_motor_off: error writing 5 to register 0x1000: Connection timed out
set_motor_off: error writing 5 to register 0x1000: Connection timed out
set_motor_off: error writing 5 to register 0x1000: Connection timed out

$ mbpoll -m rtu -a 1 -0 -t 4:hex -v  -r 0x1000 -b 38400 -P none /dev/ttyUSB0 0005
debug enabled
Set start reference=4096
Set rtu baudrate=38400
Set rtu parity=none
Set device=/dev/ttyUSB0
1 write data have been found
Set data=5
Word[0]=0x5
mbpoll 1.0-0 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.

Opening /dev/ttyUSB0 at 38400 bauds (N, 8, 1)
Set response timeout to 1 sec, 0 us
Protocol configuration: Modbus RTU
Slave configuration...: address = [1]
                        start reference = 4096, count = 1
Communication.........: /dev/ttyUSB0,      38400-8N1
                        t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

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Waiting for a confirmation...
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Written 1 references.