IMMFP12 ABB Transmission module
Brand ABB Color Standard Application Industrial height 175mm rated current 385mA
Protection Level IP45 Suitable for motor power 366KW Application Site Power Industry Material Code GJR2391500R1220 Power industry HIEE401782R0001 Part No. IMMFP12
Applicable pipe 2 Whether imported is weighing 4.38 kg can be sold nationwide
IMMFP12 ABB Transmission module
2, the use of serial communication
Serial communication is completed with three wires: (1) ground, (2) transmit, and (3) receive. Since serial communication is asynchronous, the port can send data on one line while receiving data on the other. Other lines are used for handshakes, but they’re not.
The important parameters of serial communication are baud rate, data bit, stop bit and parity check. For the two ports that pass, these parameters match:
a, baud rate: This is a parameter that measures the speed of communication. It represents the number of bits transferred per second. For example, 300 baud indicates that 300 bits are sent per second. When we refer to clock period, we are referring to baud rate for example if the protocol requires 4800 baud rate, then the clock is 4800Hz. This means that serial communication has a sampling rate of 4800Hz on the data line. The usual baud rates for telephone lines are 14400,28800 and 36600. The baud rate can be much greater than these values, but the baud rate is inversely proportional to the distance. High baud rates are often used for communication between instruments placed very close together.
b, data bits: This is a parameter that measures the actual data bits in the communication. When a computer sends a packet of information, the actual data is not 8-bit; the standard values are 5, 7, and 8 bits. How you set this up depends on the message you want to send. For example, the standard ASCII code is 0 to 127 (7 bits). The extended ASCII code ranges from 0 to 255 (8 bits). If the data is in simple text (standard ASCII code), then each packet uses 7 bits of data. Each packet refers to one byte, including start/stop bits, data bits, and parity bits. Since the actual data bit depends on the choice of communication protocol, the term “packet” refers to any case of communication.
c, stop bit: used to represent the last bit of a single package. Typical values are 1,1.5 and 2 digits. Since the data is timed on the transmission line, and each device has its own clock, it is possible that there is a small unsynchronization between the two devices in the communication. So the stop bit not only signals the end of the transmission, but also provides the computer with an opportunity to correct clock synchronization. The more bits that apply to the stop bit, the greater the tolerance for different clock synchronizations, but the slower the data transfer rate.
d, parity bit: a simple error detection method in serial communication. There are four error detection methods: even, odd, high and low. Of course, no check bit is also possible. In the case of even and odd check, the serial port sets the check bit (the bit after the data bit) and uses a value to ensure that the transmitted data has an even or odd logical high level. For example, if the data is 011, then for parity, the check bit is 0 and the number of logical high bits is an even number. If it is an odd check, the check bit is 1, so there are three logical high bits. The high and low bits do not really check the data, and simple set the logical high or logical low check. This allows the receiving device to know the state of a bit, giving it the opportunity to determine whether noise is interfering with the communication or whether the transmitted and received data are out of sync.
IMMFP12 ABB Transmission module
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