CLI arguments

• --host, -h address of the machine hosting modbus server
• --port, -p port on which modbus server is listening, by default 502
• --proto, -P protocol to be used, possible options are udp or tcp, by default tcp
• --headless, -H if set, given --command will be executed after successful connection, it's result will be printed to stdout and application will exit
• --command, -c command to be executed in headless mode

commands

# write coils
wc A C1 C2 ... Cn

# write holding registers
wh A R1 R2 ... Rn

where:

• A is address on which writing should start
• C is coil value 1 or 0 that should be set
• R is 16-bit register value that should be set, hexadecimal format is supported with prefix 0x

# read coils
rc A N

# read descrete coils
rd A N

# read input registers
ri A N

# read holding registers
rh A N

where:

• A address on which reading should start
• N number of registers or coils to read