1、 TIA-723-1998 APPROVED: SEPTEMBER 3, 1998 REAFFIRMED: MAY 20, 2003 REAFFIRMED: DECEMBER 7, 2012 TIA-723 September 1998High Speed 232 Type DTE/DCE Interface NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunderstandings between manufa
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19、SUCH LIMITATIONS. STD-EIA TIA-723-ENGL 1978 3234b00 Ob05011 28T m TINEIA-723 HIGH SPEED 232 TYPE DTWDCE INTERFACE (From Standards Proposal No . 3855 formulated under the cognizance of TIA Subcommittee TR-30.2 on Data Transmission Interfaces) Contents Page 1 SCOPE . 1 1 . 1 Section abstracts . 1 1.2
20、Application 1 1.3 Serialization 1 1.4 Synchronoushonsynchronous communication . 1 1.5 Classes of service . 1 2 NORMATIVE REFERENCES . 1 3 SIGNAL CHARACTERISTICS 2 3.1 Electrical characteristics 2 3.2 Protective ground (frame ground) . 2 3.3 Shield (25 and 26-position connectors) . 2 3.4 Circuit grou
21、nding (Signal Common) 2 3.5 “Fail Safe” operation 3 3.6 General signal characteristics . 3 3.6.1 Distortion . 3 3.6.2 Timing . 3 4 INTERFACE MECHANICAL CHARACTERISTICS . 5 4.1 Definition of mechanical interface 5 4.2 25-position interface connector . . 5 4.3 Alt A 26-position interface connector . 5
22、 4.4 Alt B 9-position interface connector . 6 i TINEIA-723 4.5 Connector contact assignments 16 5 FUNCTIONAL DESCRIPTION OF INTERCHANGE CIRCUITS 17 5.1 5.2 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.3.6 5.3.7 5.3.8 5.3.9 5.3.1 O 5.3.1 1 5.3.12 5.3.1 3 5.3.14 5.3.1 5 5.3.1 6 5.3.1 7 5.3.18 5.3.1 9 5.3.20 5.
23、3.21 5.3.22 General . 17 Classifications of circuits . 17 Definitions of interchange circuits 17 Circuit AB . Signal Common 17 Circuit BA . Transmitted Data 18 Circuit BB . Received Data 19 Circuit CA - Request to Send 19 Circuit CB - Clear to Send . 20 Circuit CC - DCE Ready 20 Circuit CD . DTE Rea
24、dy 21 Circuit CE - Ring Indicator . 22 Circuit CF - Received Line Signal Detector 22 Circuit CJ - Ready for Receiving 22 Circuit CK - Received Energy Present . 23 Circuit LL - Local Loopback . 23 Circuit RL - Remote Loopback . 24 Circuit TM - Test Mode 24 Circuit DA - Transmitter Signal Element Timi
25、ng (DE Source) 24 Circuit DB - Transmitter Signal Element Timing (DCE Source) 25 Circuit DD - Receiver Signal Element Timing (DCE Source) . 25 Circuit SBA - Secondary Transmitted Data 26 Circuit SBB - Secondary Received Data 26 Circuit SCA . Secondary Request to Send 26 Circuit SCB - Secondary Clear
26、 to Send . 26 Circuit SCF - Secondary Received Line Signal Detector . 26 6 RECOMMENDATIONS AND EXPLANATORY NOTES 27 6.1 Line signals . 27 6.2 Use of circuits for testing . 27 6.2.1 Local loopback 28 6.2.2 . Remote loopback 28 6.2.3 Test mode . 29 6.3 Use of Circuit LL for “Busy Out“ 29 L Annex A (in
27、formative) . 30 ii TINEIA-723 FOREWORD (This foreword is not part of this Standard.) This standard was developed to provide a DTE/DCE interface, similar to TINEIA-232, operating at data rates up to 512 kbit/s. It is interoperable with TINEIA-232-F and TINEIA-687 at lower data rates. This interface p
28、rovides three different connectors: the standard 25-pin connector, Alternative A 26-pin full function connector and Alternative B 9-pin for non-synchronous use . 111 STD-EIA TIA”723-ENGL 1998 m 3234b00 Ob05014 T77 W TINEIA-723 I SCOPE I .I Section abstracts This Standard is applicable to the interco
29、nnection of data terminal equipment (DTE) and data circuit-terminating equipment (DCE) employing serial binary data interchange with control information exchanged on separate control circuits. It defines: Section 2 NORMATIVE REFERENCES Section 3 SIGNAL CHARACTERISTICS Section 4 INTERFACE MECHANICAL
30、CHARACTERISTICS Section 5 FUNCTIONAL DESCRIPTION OF INTERCHANGE CIRCUITS Section 6 RECOMMENDATIONS AND EXPLANATORY NOTES I .2 Application This Standard applies where equipment on one side of the DTUDCE interface is intended for connection directly to equipment on the other side without additional te
31、chnical considerations. Applications where cable termination, signal waveshaping, interconnection cable distance, and mechanical configurations of the interface must be tailored to meet specific user needs are not precluded but are beyond the scope of this Standard. I .3 Serialization This Standard
32、applies to data communication systems where the data is bit serialized. No restrictions are placed on the sequence of bits. 1.4 Synchronoushonsynchronous sommunication This Standard applies to both synchronous and nonsynchronous serial binary data communications systems. I .!i Classes of service Thi
33、s Standard applies to switched, nonswitched, dedicated, leased or private line service. Consideration is given to both point-to-point and multipoint operation. 2 NORMATIVE REFERENCES The following standards contain provisions which, through reference in this text, constitute provisions of this Stand
34、ard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards 1 TINEIA-723 indicated below. ANSI and TIA m
35、aintain registers of currently valid national standards published by them. ANSIKINEIA-334-B Signal Quality at Interface Between Data Terminal Equipment and Synchronous Data Cinuit-Terminating Equipment for Serial Data Transmission ANSITTINEIA-404-B Standard for Statt-Stop Signal Quality for Non-Sync
36、hronous Data Terminal Equipment ANSITTINEIA-694 Electrical Characteristics of Unbalanced Digital lnterface for Signaling Rates up to 512 kbWs 3 SIGNAL CHARACTERISTICS 3.1 Electrical characteristics The electrical characteristic of the interchange circuits are specified in ANSITTINEIA-694. The meanin
37、g of circuit conditions “ON“ and “OFF“ for control and timing circuits, and “O“, “I“, “MARK“, and “SPACE“ for data circuits, shall be as defined in ANSITTINEIA-694. 3.2 Protective ground (frame ground) In DTEs and in DCEs, protective ground is a point that is electrically bonded to the equipment fra
38、me. It may also be connected to external grounds (e.g., through the third wire of the power cord). It should be noted that protective ground (frame ground) is not an interchange circuit in this Standard. If bonding of the equipment frames of the DCE and the DTE is necessary, a separate conductor sho
39、uld be used that conforms to the appropriate national or local regulation applying to wire size and color coding. 3.3 Shield (25 and 2:bposition connectors) In order to facilitate the use of shielded interconnecting cable, interface connector contact number 1 is assigned for this purpose. This will
40、permit the cable associated with the DTE to be composed of tandem connectorized sections with continuity of the shield accomplished by connection through this contact in the connectors. Normally the DCE should make no connection to interface connector contact number 1. It is recognized that for cert
41、ain electromagnetic interference (EMI) suppression situations, additional provisions may be necessary but are beyond the scope of this Standard. 3.4 Circuit grounding (Signal Common) Proper operation of the interchange circuits requires the presence of a path between the DTE circuit common and the D
42、CE circuit common. This path is obtained by means of two interchange Circuits AB, Signal Commons. Both the DCE and the DTE normally should have 2 TINEIA-723 their circuit common connected to their protective ground through a resistance of 100 ohms (k20%) having a power dissipation rating of one-half
43、 watt. Figure 1 illustrates the signal common and grounding arrangement. 3.5 “Fail Safe” operation The receivers of the following interchange circuits: Circuit CC (DCE Ready) Circuit CA (Request to Send) Circuit CD (DTE Ready) shall be used to detect a power-off condition in the equipment connected
44、across the interface and the disconnection of the interconnection cable. Detection of either of these conditions shall be interpreted as an OFF condition of the interchange circuit. 3.6 General signal characteristics 3.6.1 Distortion Interchange circuits transfemng data signals across the interface
45、point shall hold the marking (binary ONE) and spacing (binary ZERO) conditions for the total nominal duration of each signal element. Distortion tolerances for synchronous systems are set forth in TINEIA-334-B. Distortion tolerances for nonsynchronous systems are set forth in TINEIA-404-B. 3.6.2 Tim
46、ing Interchange circuits transferring timing signals across the interface point shall hold ON and OFF conditions for nominally equal periods of time consistent with acceptable tolerances as specified in TINEIA-334-B. Accuracy and stability of the timing information on Circuit DD (Receiver Signal Ele
47、ment Timing) is required only when Circuit CF (Received Line Signal Detector) is in the ON condition. Drift during the OFF condition of Circuit CF is acceptable: however, resynchronization of the timing information on Circuit DD must be accomplished as rapidly as possible following the OFF to ON tra
48、nsition of Circuit CF. It is desirable that the transfer of timing information across the interface be provided during all times that the timing source is capable of generating this information (.e., it should not be restricted only to periods when actual transmission of data is in progress). During
49、 periods when timing information is not provided on a timing interchange circuit, the interchange circuit shall be clamped in the OFF condition. Tolerances on the relationship between data and associated timing signals shall be in accordance with TINEIA-334-B. 3 TINEIA-723 i; Unbalanced common Frame Ground circuit AB i Signal Commons f f i Note 2 Shield i I GWG GWG I (Note 1) (Note 1) Note 1 : GWG is green wire ground of power system Note 2: Normally no connection to shield in DCE (see 2.3) Figure I - Signal Common and Grounding Arrangement 4 4 INTERFACE MECHANICAL CHARACTERISTI
