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SP237AET Datasheet(PDF) 11 Page - Sipex Corporation |
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SP237AET Datasheet(HTML) 11 Page - Sipex Corporation |
11 / 17 page 11 Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers © Copyright 2004 Sipex Corporation Data Terminal Ready (DTR) This is the pin the computer uses to tell periph- eral devices that it is on–line and ready to communicate. Data Set Ready (DSR) Peripheral devices use this line to tell the com- puter that they are on–line and ready to commu- nicate. When the modem is turned on and has completed its self–test routine (assuming it does one), it will send a signal to the PC by asserting this line. Request To Send (RTS) The computer activates this line to notify the peripheral device that it is ready to send data. In this example, the computer notifies the modem that it is ready to send data to be transmitted by the modem. Clear To Send (CTS) This is the line on which the peripheral device tells the computer that it is ready to receive data from the computer. If the modem was not ready, i.e. it was performing a loop–back self–test, for example, it would not assert this line. Once the modem was ready to receive data from the PC, it would assert this line. When it receives the CTS signal from the modem, the PC knows that a data transmission path has been established between itself and the modem. Transmitted Data (TD or TX) This is the pin on which the computer sends the actual data signal to be transmitted, i.e. a posi- tive voltage (+3V to +15V) to represent a logic “0”, and a negative voltage (–3V to –15V) to represent a logic “1”. The PC would send the data on this line to be transmitted by the modem. Ring Indicator (RI) This line is used by the peripheral device to tell the computer that a remote device wants to start communicating. The modem would activate the RI line to tell the computer that the remote modem was calling, i.e. the phone is ringing. Data Carrier Detect (DCD) This line is used by the modem to tell the computer that it has completed a transmission path with the remote modem, and to expect to start receiving data at any time. Received Data (RD or RX) This is the pin on which the modem sends the computer the incoming data signal, i.e. a posi- tive voltage (+3V to +15V) to represent a logic “0”, and a negative voltage (-3V to -15V) to represent a logic “1”. INTERFACE EXAMPLE – A PRINTER ON THE IBM PC SERIAL PORT The RS-232 standard defines 22 serial interface signals. These signals consist of ground lines, timing, data, control and test signals, plus a set of signals rarely used for a second data channel. Many of these signal lines are not used in typical RS-232 applications; in fact, the IBM® PC serial port is implemented using only nine pins. For example, consider the case of a PC using this nine pin port to communicate with a peripheral device such as a printer. We see the following activity on each of the RS-232 lines as the com- puter and printer are activated and communicate. Signal Ground (GND) The Signal Ground pin acts as a reference for all the other signals. This pin is simply maintained at a 0V level to serve as a level to which all other signals are referenced. Both the PC and the printer will have this line connected to their respective internal ground lines. Data Terminal Ready (DTR) This is the pin the computer uses to tell peripheral devices that it is on–line and ready to communi- Computer D R D R R D R D Transmitted Data (To Be Printed) Ready To Send Clear To Send Data Set Ready Signal Ground 4 2 5 6 7 Received Data (To Be Printed) Ready To Send Clear To Send Data Set Ready Signal Ground Printer SP231A/232A SP231A/232A IBM Printer Port Interconnections |
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