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Figure 1570 Digital data encoded for analog transmission
The maximum shunt capacitance of the load cannot exceed 2,500 pF; this, in effect, limits the maximum length of the cables used in the connection The load resistance must be between 300 and 3 k Three wires are used for data transmission One wire each is used for receiving and transmitting data; the third wire is a signal return line (signal ground) In addition, there are 22 wires that can be used for a variety of control purposes between the DTE and DCE The male part of the connector is assigned to the DTE and the female part to the DCE Figure 1571 labels each of the wires in the 25-pin connector Since each side of the connector has a receive and a transmit line, it has been decided by convention that the DCE transmits on the transmit line and receives on the receive line, while the DTE receives on the transmit line and transmits on the receive line The baud rate is limited by the length of the cable; for a 17-m length, any rate from 50 baud to 192 kbaud is allowed If a longer cable connection is desired, the maximum baud rate will decrease according to the length of the cable, and line drivers can be used to amplify the signals, which are transmitted over twisted-pair wires Line drivers are simply signal ampli ers that are used directly on the digital signal, prior to encoding For example, the signal generated by a DTE device (say a computer) may
15
Electronic Instrumentation and Measurements
Signals from modem (DCE) Pins receiving signals from terminal: 1, 2, 4, 7, 14, 19, 20, 23, 24
Signals from terminal (DTE) Pins receiving signal from modem: 1, 3, 5, 6, 7, 8, 12, 13, 15, 16, 17, 21, 23
Pin 2, Transmitted data Pin 4, Request to send Pin 20, Data terminal ready Pin 7, Signal ground Pin 1, Protective ground Pin 24, Transmit signal element timing Pin 14, Secondary transmitted data Pin 19, Secondary request to send Pin 23, Data signal selector
Received data, Pin 3 Clear to send, Pin 5 Data set ready, Pin 6 Signal ground, Pin 7 Protective ground, Pin 1 Secondary clear to send, Pin 13 Signal quality detector, Pin 21 Data rate signal selector, Pin 23 Secondary received data, Pin 16 Received line signal detector, Pin 8 Transmission signal element timing, Pin 15 Received signal element timing, Pin 17 Secondary received line signal detect, Pin 12
Figure 1571 RS-232 connections
be transmitted over a distance of up to 3,300 m (at a rate of 600 baud) prior to being encoded by the DCE The serial data can be encoded according to any code, although the ASCII code is by far the most popular
Other Communication Network Standards In addition to the popular RS-232 and IEEE bus standards, we should mention other communication standards that are commonplace or are rapidly becoming so One is Ethernet, which operates at 10 Mb/s and is based on IEEE Standard 8023 This is commonly used in of ce networks Higher-speed networks include berdistributed data interface (FDDI), which speci es an optical ber ring with a data rate of 100 Mb/s, and asynchronous transfer mode (ATM), a packet-oriented transfer mode moving data in xed packets called cells ATM does not operate at xed speed A typical speed is 155 Mb/s, but there are implementations running as fast as 2 Gb/s
Check Your Understanding
1524 Determine the actual binary data sent by a digital voltmeter reading 1506 V over an IEEE 488 bus if the data is encoded in ASCII format (see Table 146) Assume that the sequence is from most to least signi cant digit
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