Specialized Tools PUNCH UNIT-CONNECTOR 25 PIN RS232 connector is a port used for data exchange between equipment designed for data exchange between DTE or PC and DCE or MODEM.
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Oct 16, 2021
Patricia Moulton
What is RS232 and What is it used for?
Specialized Tools PUNCH UNIT-CONNECTOR 25 PIN
RS232 connector is a port used for data exchange between equipment designed for data exchange between DTE or PC and DCE or MODEM. This article will explain pinout, circuit, applications, schematics, and other details about the RS232 connector. Furthermore, there is a huge range of semiconductors, capacitors, resistors, and ICs in stock. Welcome your RFQ!
RS232
The RS232 connector is a port that allows data to be exchanged between devices. It was created to transfer data between DTE (Data Terminal Equipment) or a computer and DCE (Data Communication Equipment) or a modem. Parallel data exchange posed constraints, which necessitated the use of RS232. RS232 is a serial communication standard that allows data to be sent bit by bit. Although speedier USB (Universal Serial Bus) eventually superseded RS232, it remains popular in some areas. RS232 used to be a 25-pin connector. However, it has since been reduced to merely 9 pins.
| Pin Number | Pin Name | Description |
| DATA pins (Data flow takes through these pins) | ||
| 2 | RXD | Receive Data (Data is received through this pin) |
| 3 | TXD | Transmit Data (Data is transmitted through this pin) |
| CONTROL pins (These pins are for establishing interface and to avoid data loss) | ||
| 1 | CD | Carrier Detect(Set by MODEM when the answer is received by remote MODEM ) |
| 4 | DTR | Data Terminal Ready(Set by PC to prepare MODEM to be connected to telephone circuit) |
| 6 | DSR | Data Set Ready(Set by MODEM to tell PC it is ready to receive and send data) |
| 7 | RTS | Request To Send(Set by PC to tell MODEM that MODEM can begin sending data) |
| 8 | CTS | Clear To Send(Set by MODEM to tell PC that it is ready to receive data) |
| 9 | RI | Set by MODEM to tell PC a ringing condition has been detected. |
| REFERENCE | ||
| 5 | GND | Ground (Used as reference for all pin voltage pulses) |
Voltage Levels: RS232 is also used as ground & 5V level. Binary 0 works with voltages up to +5V to +15Vdc. It is called ‘ON’ or spacing (high voltage level) whereas Binary 1 works with voltages up to -5V to -15Vdc. It is called ‘OFF’ or marking (low voltage level).
Received signal voltage level: Binary 0 works on the received signal voltages up to +3V to +13 Vdc & Binary 1 works with voltages up to -3V to -13 Vdc.
Line Impedance: The impedance of wires is up to 3 ohms to 7 ohms & the maximum cable length is 15 meters, but the new maximum length is in terms of capacitance per unit length.
Operation Voltage: The operation voltage will be 250v AC max.
Current Rating: The current rating will be 3 Amps max.
Dielectric withstanding voltage: 1000 VAC min.
Slew Rate: The rate of change of signal levels is termed as Slew Rate. Its slew rate is up to 30 V/microsecond and the maximum bitrate will be 20 kbps.
Greenlee Communications RS232 technical specifications, attributes, parameters and parts with similar specifications to Greenlee Communications RS232.
| Product Attribute | Attribute Value | |
|---|---|---|
| Factory Lead Time | 4 Weeks | |
| Number of Pins | 25Pins | |
| Weight | 272.15545g | |
| Published | 2009 |
| Product Attribute | Attribute Value | |
|---|---|---|
| Part Status | Active | |
| Moisture Sensitivity Level (MSL) | Not Applicable | |
| Tool Type | Punch | |
| Height | 11.9mm |
| Product Attribute | Attribute Value | |
|---|---|---|
| Length | 88.9mm | |
| Width | 42mm | |
| REACH SVHC | Unknown | |
| RoHS Status | Non-RoHS Compliant |
Easy to use
Stable, high speed
High-cost performance
±15-kV ESD Protection
Low power consumption
Two Drivers and Two Receivers
Female DB9 Header
Low cost
Widely available and applicable due to its long presence in the telecommunications industry
Many manufacturers still use RS232 to connect PLCs to devices like HMIs, input and output modules, motor drives, etc.
Simple wiring and connectors will only max support for 1 driver and 1 receiver
Suitable for long-distance transmissions
Similar to microcontroller serial signals; transmit bits one at a time, at specific baud rates, with/without parity and/or stop bits
Still requires max232 to avoid voltages to destroy microcontroller serial pins
Personal Computers
Modems
Servers
Memory devices
Motor control units
Printers and Scanners
Telephone lines
Used basically where serial data transfer is required
RS232 is a serial communication standard that is used to connect a computer and its peripheral devices so that serial data can be sent between them. It obtains the voltage for the data transmission route between the devices. It has a 1.492kbps rate and is utilized in serial communication up to 50 feet. The RS232 is used to connect Data Transmission Equipment (DTE) and Data Communication Equipment (DCE), as defined by the EIA (DCE).
We need a MAX232 IC to convert high voltage signals to TTL and vice versa because we can't connect RS232 directly to the controller. The circuit diagram for it is provided below.
RS232 Circuit
We're using a MAX232 converter chip to link the controller to a female RS232 port. In RS232, the communication voltages can be as high as +15V and as low as -15V. Because voltage levels can't be used in delicate devices, we employ MAX232 as a mediator.
The chip converts controller TTL logic pulses to RS232 voltage level pulses and back. You could permanently damage something if you don't have this chip.
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