Quick Start

Scan Holding Registers

modscanner scan holding \
    --host 192.168.1.10 \
    --start 0 \
    --count 20

modscanner uses:

• TCP port 502 by default

• device ID 1 by default

• zero-based Modbus protocol addresses

Read Coils

modscanner scan coils \
    --host 192.168.1.10 \
    --start 0 \
    --count 8

Read Discrete Inputs

modscanner scan discrete-inputs \
    --host 192.168.1.10 \
    --start 0 \
    --count 8

Read Input Registers

modscanner scan input \
    --host 192.168.1.10 \
    --start 0 \
    --count 20

Write a Coil

modscanner write coil \
    --host 192.168.1.10 \
    --address 0 \
    --value 1

CLI coil values are:

• 1 = ON | True

• 0 = OFF | False

Writing a Holding Register

modscanner write register \
    --host 192.168.1.10 \
    --address 100 \
    --value 50

---

Network Discovery

modscanner scan-network \
    --subnet 192.168.1.0/24

To attempt vendor discovery

modscanner scan-network \
    --subnet 192.168.1.0/24 \
    --show-vendor