SDO:drivers:modbus

Alllows accessing of RS485 or TCP ModBus.

settings

setting	values	description
type	pyRTU \| RTU \| TCP	pyRTU - python only modbus stack RTU - libmodbus stack TCP - python modbus/TCP
mode	master \| slave
debug	True \| False
port	/dev/ttyMB	tty device path
baudrate	50 \| 75 \| 110 \| 134 \| 150 \| 200 \| 300 600 \| 1200 \| 1800 \| 2400 \| 4800 \| 9600 19200 \| 38400 \| 57600 \| 115200
parity	none \| odd \| even
bits	8
stopbits	1
asynchronous	True \| False	poll datapoints in the background
autopoll	True \| False
sleep_interval	float(0..x)	sleep time between polls in [s]
fork_tcp_gateway	True \| False	enable raw access via ModBus/TCP
ferrors_remove_dp	int(1..x)	remove datapoint from poll list after x read failures
ferrors_dp_block_time	float(1..x)	block datapoint for time x
ferrors_device_block	int(1..x)	block device after x read errors
ferrors_device_block_time	float(1..x)	block all device datapoints for time x
int_values	True \| False	return objects (True) or hex-string(False)

/<driver_name>/<slave_address>/<function_code>/<register_address>:<length>/<field>

uri-part	values	description
slave_address	int_hex(0..ff)	slave address of modbus device
function_code	int_hex(3\|4)	3 - Holding 4 - Input
register_address	int_hex(0000..ffff)	register address
length	int_hex(0..x)	count of words to read, optional, default=1
field	<empty> \| _raw \| time \| state \| verbose	<empty> - value _raw - raw object time - request succeeded time state - last request state verbose - list of [time succeeded,valid value,last state,last request time,last value]

URI	/mb_master/00/04/007b	/mb_master/0a/03/0005/verbose
slave_address	00	0a (hex) = 10 (dec)
function_code	04 - InputRegister	03 - HoldingRegister
register_address	007b (hex) = 123 (dec)	0005 (hex) = 5 (dec)
length	1	1
field		verbose
description	read InputRegister @ address 123 from device 0	return verbose state of HoldingRegister @ address 5 from device 10