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[MB2HAL] 
# === Serial Port Settings ===
TYPE=rtu
DEVICE=/dev/ttyUSB0
BAUD=9600
PARITY=E
STOPBITS=1
DATABITS=8
SLAVE=1 
POLL_RATE=100 ; ms 
#=========================================================
# WRITE REGISTERS
# ========================================================= 
# HAL pin: hy.fc01.control → Modbus register 0x2000
# Example values:
# 0x0001 = Forward Run
# 0x0002 = Reverse Run
# 0x0005 = Stop
# 0x0006 = E-Stop
# 0x0007 = Reset Fault 
[WR_REG_1]
MBREG=0x2000
HALPIN=hy.fc01.control
TYPE=u16 
# HAL pin: hy.fc01.freq_set → FC01 expects freq ×100
# Write float in Hz, MB2HAL will convert via SCALE
[WR_REG_2]
MBREG=0x2001
HALPIN=hy.fc01.freq_set
TYPE=float
SCALE=100 ; multiply when writing 
# =========================================================
# READ REGISTERS
# ========================================================= 
# Output frequency (×100)
[RD_REG_1]
MBREG=0x3001
HALPIN=hy.fc01.freq
TYPE=float
SCALE=0.01 ; divide when reading 
# Bus Voltage
[RD_REG_2]
MBREG=0x3002
HALPIN=hy.fc01.busvolt
TYPE=float 
# Output Voltage
[RD_REG_3]
MBREG=0x3003
HALPIN=hy.fc01.outvolt
TYPE=float 
# Current
[RD_REG_4]
MBREG=0x3004
HALPIN=hy.fc01.current
TYPE=float 
# Speed (RPM)
[RD_REG_5]
MBREG=0x3005
HALPIN=hy.fc01.speed
TYPE=float 
# =========================================================
# ERROR HANDLING
# ========================================================= 
# Create a HAL bit pin that becomes TRUE if MB2HAL detects a Modbus exception
[ERROR_BIT]
HALPIN=hy.fc01.fault

loadusr -W mb2hal fc01_vfd.ini
net spindle-enable => hy.fc01.control
loadrt mux2 count=1
addf mux2.0 servo-thread 
# select direction code
setp mux2.0.in0 1 # forward
setp mux2.0.in1 2 # reverse
net spindle-reverse mux2.0.sel
net spindle-code mux2.0.out => hy.fc01.control
net spindle-speed-cmd => hy.fc01.freq_set

sudo ethtool --show-eee enp6s0

And it show that the eee is inactive.
but the value is still over 5ms.