Tajima Serial Connection On Laptop
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The external connector for a serial port can be either 9 pins or 25 pins. Originally, the primary use of a serial port was to connect a modem to your computer. The pin assignments reflect that. Let's take a closer look at what happens at each pin when a modem is connected.
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9-pin connector:
- Carrier Detect - Determines if the modem is connected to a working phone line.
- Receive Data - Computer receives information sent from the modem.
- Transmit Data - Computer sends information to the modem.
- Data Terminal Ready - Computer tells the modem that it is ready to talk.
- Signal Ground - Pin is grounded.
- Data Set Ready - Modem tells the computer that it is ready to talk.
- Request To Send - Computer asks the modem if it can send information.
- Clear To Send - Modem tells the computer that it can send information.
- Ring Indicator - Once a call has been placed, computer acknowledges signal (sent from modem) that a ring is detected.
Tajima Serial Connection On Laptop Computer
25-pin connector:
What Is A Serial Connection
- Not Used
- Transmit Data - Computer sends information to the modem.
- Receive Data - Computer receives information sent from the modem.
- Request To Send - Computer asks the modem if it can send information.
- Clear To Send - Modem tells the computer that it can send information.
- Data Set Ready - Modem tells the computer that it is ready to talk.
- Signal Ground - Pin is grounded.
- Received Line Signal Detector - Determines if the modem is connected to a working phone line.
- Not Used: Transmit Current Loop Return (+)
- Not Used
- Not Used: Transmit Current Loop Data (-)
- Not Used
- Not Used
- Not Used
- Not Used
- Not Used
- Not Used
- Not Used: Receive Current Loop Data (+)
- Not Used
- Data Terminal Ready - Computer tells the modem that it is ready to talk.
- Not Used
- Ring Indicator - Once a call has been placed, computer acknowledges signal (sent from modem) that a ring is detected.
- Not Used
- Not Used
- Not Used: Receive Current Loop Return (-)
Voltage sent over the pins can be in one of two states, On or Off. On (binary value '1') means that the pin is transmitting a signal between -3 and -25 volts, while Off (binary value '0') means that it is transmitting a signal between +3 and +25 volts..