What Your Clients Really Assume About Your Rs485 Cable? > 자유게시판

Some of these converters can convert from RS232 to both RS485 and RS422 however many standard models only has one of the protocols. Even RS485 is not commonly as popular as RS232 it is extremely useful for converters in industrial and commercial environments. RS485, also known as TIA/EIA-485 is a standard serial communications protocol defining the electrical characteristics of a serial converter, drivers and receivers for use in balanced RS485 digital multipoint systems. In contrast to EIA-485 (which is multi-point instead of multi-drop), EIA-422/V.11 does not allow multiple drivers but only multiple receivers. The advantage of the RS485 protocol is that this it can transfer data over longer distances, up to 4000 feet, and have up to 32 nodes per single network, and it can be used for multi-point networks where multiple serial devices are setup in a bus network. So in order to transfer data from a RS232 serial interface engineers need a converter to be able to connect to a RS485 or RS422 interface. Bus Probes are a family of low-power environmental sensors with an RS485 interface. If you want to use a stack with RS485 Extension in your existing Modbus network, you have to match the values with the other bus participants.

Usually a RS232 - RS485 converter is the preferred way to establish multi-point networks when working with RS232 devices. A Modbus RS485 connects a Master device to one or more Slave devices. You have to power up the slaves before the master, since the RS485 master searches for slaves only at startup. The IDs have to be unique on the bus. If the bus is longer than a few meters then some kind of twisted pair cable is recommended. If you use a twisted pair cable, make sure to use the same twisted pair for A and B, but use another twisted pair for GND. Why use a RS232 - RS485 /RS422 converter? If the bus is only a few meters long then the cable you use should not matter. For master configuration choose "Master" as type and input the addresses of the slaves in the RS485 bus as a comma separated list. This is a method for connecting multiple RS485 devices with each other over a two-wire network. These devices allow you to view and modify the parameters of heat controllers, connected to the RS485 port via the communication protocol and the NCP to monitor the parameters of heat meters (Mbus), connected to RS232 port via a converter RS232/Mbus (M-bus master).

Wire up the RS485 stacks and set the termination switch on the first and last RS485 Extension in the bus to "on", as shown below. You should see the Master Brick view with the identified RS485 Extension (see images below). If you restart the RS485 Master, every Brick/Bricklet of the RS485 network will send the initial enumeration message again. If you restart the RS485 Slave, only the Bricks/Bricklets that are connected to this stack will send the initial enumeration message again. These signals are commonly called A and B in RS485 systems. The serial RS232 to RS485 converter and RS232 to RS422 converter units, also called serial converters, are small electronic devices used to convert a serial RS232 signal, (for example the COM port in older computers) into either RS485 or RS422 signals. To create a RS485 bus, stack the RS485 Extension on top of a Master Brick. The 735 series are desk top terminals and the companion 720 wall mount units. SMTP - the units can be ordered with the firmware option that sends SMTP messages to a central 'mail server'as an alternative means of integration. The central four pins remain their original RS232 functionality. However since only a true RS485 network can have addressable serial RS485 devices, the RS232 converter needs to be addressable either by software or by DIP switches when using it in this type of configuration.

Therefore for RS485 communications no crossover cable is used. The POE version makes this a single cable connection that will allow monitoring from anywhere in the world; anywhere with internet access that is. When a single RS485 meter or counter is connected to a PC via a cable CBL06, set the PC to 9600 baud. A RS232 - RS485 converter is often used in industrial data acquisition and control applications where multiple serial devices communicate with each other through a converter. The RS232 - RS422 converter is also often used in older serial devices such as older PLC's and terminal equipment. The reason is that the serial RS232 protocol is, even its old, a very reliable, stable and solid communication protocol, which can easily be implemented with existing industrial equipment. A single analog input meter or transmitter can stream readings to a PC at up to 60 readings per second and the Custom ASCII protocol set to continuous (or streaming) model. In a three-phase system, instruments can be installed that measure the single electrical parameter, one per phase, or a voltmeter and a current can be installed with the voltage and current switches, allowing the measurements to be displayed in sequence.

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