p # IP protocol port number (502 is default) Options for MODBUS/TCP, UDP and RTU over TCP: 1 Poll only once only, otherwise every poll rate interval 0 First reference is 0 (PDU addressing) instead 1 e Use Daniel/Enron single register 32-bit mode (implies -i and -f)
f Slave operates on big-endian 32-bit floats i Slave operates on big-endian 32-bit integers t 4:float 32-bit float data type in output (holding) register table t 4:mod 32-bit module 10000 type in output (holding) register table t 4:int 32-bit integer data type in output (holding) register table t 4:hex 16-bit output (holding) register data type with hex display t 4 16-bit output (holding) register data type (default)
t 3:float 32-bit float data type in input register table t 3:mod 32-bit module 10000 data type in input register table t 3:int 32-bit integer data type in input register table t 3:hex 16-bit input register data type with hex display c # Number of values to read (1-125, 1 is default) a # Slave address (1-255 for serial, 0-255 for TCP, 1 is default) m tcp MODBUS/TCP protocol (default otherwise) m rtu Modbus RTU protocol (default if SERIALPORT contains \ or COM) If none specified (default) modpoll reads data. WRITEVALUES List of values to be written. HOST Host name or dotted IP address when using MDBUS/TCP protocol SERIALPORT Serial port when using Modbus ASCII or Modbus RTU protocol Modpoll 3.6 - FieldTalk(tm) Modbus(R) Master Simulator ^ ^ ^ ^ ^ 16-bit holding registers, display as hexįirst reference is 0 (PDU addressing) instead 1 ^ ^ ^ ^ ^ ^ If not present then read else write It runs on Windows and Linux.Įxample usage (note that unless specified modpoll assumes register addresses start at 0x1): Line based Modbus master simulator and test utility. This is so that the master knows who theĭata model based on "tables", which are essentially registers of which there ar 4 types:įor each table, protocol allows individual selection of 65,536 data items,Ī summary of some of the most common 16-bit tables (aka registers): In the same way that the client device echoes back the function code to the master, itĪlso echoes back it's own ID in its response. The RTU frame over RS485 looks like this: Adds an address prefix and a CRC suffix,.Wraps a PDU : Additional address | PDU | Error check = Additional address | Function Code | Data | Error check,.In PDU each data item address from 0 to 65535,.1-byte function code, followed by data: - Exception response echoes function code | 0x80.A working slave mustĪlways respond with either an exception or a meaningful result. Request / reply protocol, services specified by function codes. Big endian, application layer messaging protocol,
0 kommentar(er)
