1、 TIA-232-F-1997 APPROVED: SEPTEMBER 30, 1997 REAFFIRMED: OCTOBER 11, 2002 REAFFIRMED: DECEMBER 7, 2012 TIA-232-F (Revision of TIA-232-E) October 1997Interface Between Data Terminal Equipment and Data Circuit- Terminating Equipment Employing Serial Binary Data Interchange NOTICE TIA Engineering Stand
2、ards and Publications are designed to serve the public interest through eliminating misunderstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for th
3、eir particular need. The existence of such Standards and Publications shall not in any respect preclude any member or non-member of TIA from manufacturing or selling products not conforming to such Standards and Publications. Neither shall the existence of such Standards and Publications preclude th
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5、 obligation whatever to parties adopting the Standard or Publication. This Standard does not purport to address all safety problems associated with its use or all applicable regulatory requirements. It is the responsibility of the user of this Standard to establish appropriate safety and health prac
6、tices and to determine the applicability of regulatory limitations before its use. (From Project No. 3-3761-RF2, formulated under the cognizance of the TIA TR-30.2 Subcommittee on DTE-DCE Interfaces and Protocols.) Published by TELECOMMUNICATIONS INDUSTRY ASSOCIATION Technology (b) there is no assur
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18、 DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, LOSS OF PROFITS, LITIGATION, OR THE LIKE), WHETHER BASED UPON BREACH OF CONTRACT, BREACH OF WARRANTY, TORT (INCLUDING NEGLIGENCE), PRODUCT LIABILITY OR OTHERWISE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THE FOREGOING NEGATION OF DAMAGES I
19、S A FUNDAMENTAL ELEMENT OF THE USE OF THE CONTENTS HEREOF, AND THESE CONTENTS WOULD NOT BE PUBLISHED BY TIA WITHOUT SUCH LIMITATIONS. STD-EIA TIA-232-F-ENGL 1777 W 3234b00 0588584 T35 ANSITTIAIEIA-232-F INTERFACE BETWEEN DATA TERMINAL EQUIPMENT AND DATA CIRCUIT- TERMINATING EQUIPMENT EMPLOYING SERIA
20、L BINARY DATA INTERCHANGE (From TIMIA Standard EIAITIA-232-E and Standards Proposal No . 3767 formulated under the cognizance of TIA Subcommittee TR-30.2 on Data Transmission Interfaces.) Contents Page 1 SCOPE 1 1.1 Abstracts 1 1.2 InterFace Configurations . 1 Data Signaling Rates 2 I . 3 1.4 Signal
21、 Common 2 1.5 SynchronouslNonsynchronous Communication . 2 1.6 1.7 1.8 2 SIGNAL CHARACTERISTICS . 3 2.1 Electrical Characteristics 3 2.2 Protective Ground (Frame Ground) 7 2.3 Shield . 7 3 INTERFACE MECHANICAL CHARACTERISTICS 7 3.1 Definition of Mechanical Interface . 7 3.2 Cable Length 7 3.3 25-Pos
22、ition Interface Connector . 7 Classes of Service 2 Allocation of Functions . 2 Modes of Operation 3 1 STDDEIA TIA-ZIZ-F-ENGL 1997 M 3234bOCI 0588585 771 3.4 Alt A 26-Position Interface Connector 8 3.5 Pin Identification . 16 4 FUNCTIONAL DESCRIPTION OF INTERCHANGE CIRCUITS . 17 4 .I 4.2 4.3 4.4 4.4.
23、 I 4.4.2 4.4.3 4.4.4 4.4.5 4.4.6 4.4.7 4.4.8 4.4.9 4.4.1 O 4.4.1 1 4.4.12 4.4.13 4.4.14 4.4.15 4.4.16 4.4.17 4.4.18 4.4.19 4.4.20 4.4.21 4.4.22 4.4.23 4.4.24 4.4.25 General 17 Categories 17 Signal Characteristics. General 18 Interchange Circuits . 19 Circuit AB . Signal Common (ITU-T 102) 19 Circuit
24、 BA . Transmitted Data (ITU-T 103) 19 Circuit BB . Received Data (ITU-T 104) 20 Circuit CB - Clear to Send (ITU-T 106) 1 21 Circuit CC - DCE Ready (ITU-T 107) 22 Circuit CE - Ring Indicator (ITU-T 125) . 23 Circuit CF - Received Line Signal Detector (ITU-T 109) . 24 Circuit CG - Signal Quality Detec
25、tor (ITU-T 1 IO) 24 Circuit CA . Request to Send (ITU-T 105) 20 Circuit CD - DTE Ready (ITU-T 108/1 , 108/2) 23 Circuit CH - Data Signal Rate Selector (DTE Source) (ITU-T 11 1) . 24 Circuit CI - Data Signal Rate Selector (DCE Source) (ITU-T 112) 25 Circuit CJ - Ready for Receiving (ITU-T 133) . 25 C
26、ircuit CK - Received Energy Present (ITU-T 135) 25 Circuit LL - Local Loopback (ITU-T 141) . 26 Circuit RL - Remote Loopback (ITU-T 140) 26 Circuit DA - Transmitter Signal Element Timing (DTE Source) (ITU-T 11 3) . 27 Circuit SBA - Secondary Transmitted Data (ITU-T I 18) . 28 Circuit SCA - Secondary
27、 Request to Send (ITU-T 120) 29 Circuit SCB - Secondary Clear to Send (ITU-T 121) . 29 Circuit SCF - Secondary Received Line Signal Detector (ITU-T 122) . 29 Circuit TM - Test Mode (ITU-T 142) 27 Circuit DB - Transmitter Signal Element Timing (DCE Source) (ITU-T 114) . 27 Circuit DD - Receiver Signa
28、l Element Timing (DCE Source) (ITU-T 115) . 28 Circuit SBB - Secondary Received Data (ITU-T 119) . 29 5 STANDARD INTERFACES FOR SELECTED COMMUNICATION SYSTEM CONFIGURATIONS 29 5.1 Abstract 29 ii STD-EIA TIA-232-F-ENGL 1997 m 3234b00 058858b 808 m ANSITTINEIA-232-F 5.2 Conditions 30 5.3 Configuration
29、s 30 5.4 6 Use of Signal Common . 30 RECOMMENDATIONS AND EXPLANATORY NOTES . 30 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 6.9 6.9.1 6.9.2 6.9.3 Classes of Service 30 Noise Considerations . 31 Use of Relays . 32 Circuit Capacitance 33 Test Receivers . 33 Distortion 33 Line Signals 33 Use of Circuit LL for “Bus
30、y Out“ 33 Use of Circuits for Testing 34 Local Loopback 34 Remote Loopback 35 Test Mode 36 Annex A (informative) . 37 A . 1 Interconnecting Cable Characteristics 37 A.l.l Conductor Resistance 37 A.1.2 Capacitive Cable Model 37 A.1.3 Interchange Capacitance Limit . 37 A . 1.4 Simplified Electrical Eq
31、uivalent Circuit 37 A.2 Example . 39 Annex B (informative) . 40 . 111 ANSITTINEIA-232-F FOREWORD (This foreword is not part of this Standard) No technical changes have been incorporated into TINEIA-232-F that will create compatibility problems with equipment conforming to previous versions of EIAITI
32、A-232. This standard is a revision to EIA/TIA-232-E, which brings it in line with international standards ITU-T V.24, List Of Definitions For Interchange Circuits Between Data Terminal Equipment (DTE) And Data Circuit-Terminating Equipment (DCE), V.28, Electrical Characteristics For Unbalanced Doubl
33、e-Cumnt Interchange Circuits, and ISO/IEC 21 I O, 25pole DTE/DCE Interface Connector and Contact Number Assignments. The changes incorporated into this revision include: - the addition of the alternate use of connector pin 22 for Circuit CK, Received Energy Present, - the addition of definitions for
34、 rate change in Circuits DB, Transmitter Signal Element Timing, and DD, Receiver Signal Element Timing, - the addition of Section 6.9, Use of Circuits for Testing, and -the deletion of Section 7, Glossary. As with previous versions of EIAITIA-232, TINEIA-232-F provides operation to a maximum data si
35、gnaling rate of 20 kbis. For operation at rates greater than 20 kbiffs, EIAITIA standards EIA/ilA-530-AI High Speed 25Position Interface for Data Terminal Equipment and Data Circuit- Terminating Equipment, Including Alternative 26-Position Connector, ElMIA-561, Simple however, this standard does not
36、 include all of the interchange circuits required for automatically originating a connection using EIA-366-A, Interface Between Data Terminal Equipment and Automatic Calling quipment for Data Communication. Serial dialing and control is described in TINEIA-602, Data Transmission Systems and Equipmen
37、t - Serial Asynchronous Automatic Dialing and Control. 1.7 Allocation of Functions The DCE may include transmitting and receiving signal converters as well as control functions. Other functions, such as pulse regeneration, error control, etc., may or may not be provided. Equipment to provide these a
38、dditional functions may be included in the DTE or in the DCE, or it may be implemented as a separate unit interposed between the two. 1.7.1 When such additional kinctions are provided within the DTE or the DCE, this interface standard shall apply only to the interchange circuits between the two clas
39、ses of equipment. 2 STD-EIA TIA-232-F-ENGL 1777 W 3234b00 0588570 237 I ANSITTINEIA-232-F 1.7.2 When additional functions are provided in a separate unit inserted between the DTE and the DCE, this standard shall apply to both sides (the interface with the DTE and the interface with the DCE - see 3.3
40、.3 and 3.4.2) of such separate unit. 1.8 Modes of Operation This standard applies to all of the modes of operation described under the system configurations indicated in Section 5, Standard Interfaces for Selected Communication System Configurations. 2 SIGNAL CHARACTERISTICS 2.1 Electrical Character
41、istics 2.1 .l Figure 1, Interchange Equivalent Circuit, shows the electrical parameters which are specified in the subsequent paragraphs of this section. The equivalent circuit shown in Figure 1 is applicable to all data, timing or control circuits. The equivalent circuit is independent of whether t
42、he generator is located in the DCE and the receiver in the DTE or vice versa. 2.1.2 The generator on an interchange circuit shall be designed to withstand an open circuit, a short circuit between the conductor carrying that interchange circuit in the interconnecting cable and any other conductor in
43、that cable, or any passive non-inductive load connected between that interchange circuit and any other interchange circuit including Circuit AB (Signal Ground), without sustaining damage to itself or its associated equipment. The receiver on an interchange circuit shall be designed to withstand (not
44、 be damaged by) any input signal within the 25 volt limit specified in 2.1.6. 2.1.3 For data interchange circuits, the signal shall be considered in the marking condition when the voltage (V,) on the interchange circuit, measured at the interface point, is more negative than -3 volts with respect to
45、 Circuit AB (Signal Common). The signal shall be considered in the spacing condition when the voltage (V,) is more positive than +3 volts with respect to Circuit AB (see 6.2). The region between I3 volts is defined as the transition region. The signal state is undefined when the voltage (V,) is in t
46、his transition region. See Table 1. During the transmission of data, the marking condition shall be used to denote the binary state ONE and the spacing condition shall be used to denote the binary state ZERO. See Table I. 3 STD-EIA TIA-ZIZ-F-ENGL 1777 323ibUO 0588571 175 Table 1 - Interchange State
47、Signal Condition Function Receiver in terchange Circuit O C “1 CL Circuit AB, Signal Common 2 is the total effective capacitance associated with the generator, measured at the interface point and including any cable to the interface point. is the voltage at the interface point. is the total effectiv
48、e capacitance associated with the receiver measured at the interface point and including any cable to the interface point. Figure I - Interchange Equivalent Circuit 4 AN SI/TIA/E IA-232-F For timing and control interchange circuits, the function shall be considered ON when the voltage (V,) on the in
49、terchange circuit is more positive than +3 volts with respect to circuit AB, and shall be considered OFF when the voltage (V,) is more negative than -3 volts with respect to Circuit AB. The function is not uniquely defined for voltages in the transition region between 13 volts. See Table I. This specification neither implies nor precludes the use of receiver circuits which utilize hysteresis techniques to enhance their noise immunity; however, the requirements of 2. .5 must also be satisfied. 2.1.4 The load impedance of the receiver side of an interchange circuit is defined for an
