1、MIL-M-71074A 999990b 1999829 L4T W 1 INCH-POUND MIL-M-71074A (AR) 25 January 1995 (See 6.8) MILITARY SPECIFICATION MODEM, VEHICLE MOTION SENSOR: 12561737 This specification is approved for use by the U.S. Army Armament, Research, Development and Engineering Center, and is available for use by all De
2、partments and Agencies of the Department of Defense. 1. SCOPE 1.1 W. This specification establishes the requirements for manufacture and acceptance of the Vehicle Motion Sensor (vMS) Modem used in the Automatic Fire Control System (AFCS) for the M109A6 self-propelled howitzer (SPH) (see 6.1). 2. APP
3、LICABLE DOCUMENTS 2.1 Government documents. 2.1.1 SDecifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of t
4、he Department of Defense Index of Specifications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS FEDERAL PPP-c-795 - Cushioning Material, Packaging (Flexible Closed Cell Plastic Film for Long Shipping Cycle Applications) Beneficial comments (recomme
5、ndations, additions, deletions) and any pertinent data which may be of use in improving this document, should be addressed to: Commander U.S. Army ARDEC, ATTN: AMSTA-AR-EDE-S, Picatinny Arsenal, New Jersey 07806-5000 by using the Standardization Document Improvement Proposal (DD Form 1426) appearing
6、 at the end of this document or by letter. AMSC N/A FSC 1290 DISTRIBUTION S TATEMENT A: Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MILITARY - MIL - P- 11 6 MIL-B-117 - STANDARDS MILITARY MI
7、L-STD-129 - MIL-STD-454 - MIL-STD-810 - MIL-STD-1275 (AT) - MIL-STD-2000 - MIL-STD-2073 - Preservation, Methods of Bag, Sleeve, and Tubing - Interior Packaging Fungus Resistance Test Automotive Components Marking for Shipment and Storage Standard General Requirements for Electronic Equipment Environ
8、mental Test Methods Characteristics of 28 Volt DC Electrical Systems in Military Vehicles Standard Requirements for Soldered Electrical/Electronic Assemblies DOD Materiel Procedures for Development and Application of Packaging Requirements (Unless otherwise indicated, copies of the federal and milit
9、ary specifications, standards, and handbooks are available from DODSSP - Customer Service, Standardization Documents Order Desk, 700 Robbins Avenue, Bldg. 4D, Philadelphia, PA 19111-5094.) 2.1.2 Other Government documents, drawinus and mblications. The following other Government documents, drawings
10、and publications form a part of this document to the extent specified herein. Unless otherwise specified, the issues shall be those in effect on the date of the solicitation. DRAWINGS U.S. ARMY ARMAMENT RESEARCH, DEVELOPMENT AND ENGINEERING CENTER (ARDECI 12561737 - VMS Modem Assembly 12561839 - CCA
11、2, VMS Modem 12561843 - CCA1, VMS Modem (Copies of drawings, publications, and other Government documents required by the contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) 2.2 No n-Gove rnment n
12、ub lications. The following document(s1 form(s) a part of this document to the extent specified herein. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-73074A 9 9999906 3999833 BTB MIL-M-71074A (AR) Unless otherwise specified, the issue(s) of
13、 the document(s) which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are the issues of the documents cited in the solicitation (see 6.2). ELECTRONIC INDUSTRIES ASSOCIATION (EIAL EIA
14、RS-422 - Electrical Characteristics of Balanced Voltage Digital Interface Circuits (Application for copies should be addressed to Electronic Industries Association, Engineering Department, 2001 Eye Street, N.W., Washington, D.C. 20006). 2.3 Order of nrecedence. In the event of a conflict between the
15、 text of this document and the references herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. (See contract provisions for additional precedence criteria). 3. REQUIREMENTS 3.1
16、 General descriDtion. The VMS modem operates by modulating discrete digital signals into frequency encoded signals and by demodulating frequency encoded signals into discrete digital signals. 3.2 Characteristics. 3.2.1 Performance. The VMS modem shall meet the performance requirements specified in t
17、he sections below. 3.2.1.1 J1 connector siunal characteristics. All digital signal circuits shall be balanced differential voltage circuits in accordance with EIA standard RS-422. All line drivers shall comply with the generator electrical characteristics specified in EIA RS-422. All receivers shall
18、 comply with the requirements of EIA RS-422 with the following changes: a. The common mode voltage range shall be -15 to +15 vdc. b. Over the entire common mode voltage range, the receiver shall not require a differential input voltage of more than 500 millivolts dc to correctly assume the intended
19、binary state. c. The maximum voltage (signal plus common mode) between either receiver input terminal and receiver circuit ground shall 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-71074A E 0b l1999832 734 E MIL-M-71074A (AR) not exceed 18
20、 vdc in magnitude or cause the receiver circuit to operationally fail. d. The allowable input current versus input voltage characteristics shall be extended as follows: Input Voltage Range Input Current Range +10 to +18 Vdc O to +3.25 mA -18 to -10 Vdc O to -3.25 mA e. Over the entire common mode vo
21、ltage range the balance of the receiver input voltage-current characteristics and bias voltages shall be such that the receiver will remain in the intended binary state when a differential voltage of 1000 millivolts is applied through 500 ohms plus or minus 1 percent to each input terminal. The VMS
22、modem shall not be damaged or malfunctioned when signal circuits are connected or disconnected with power on or off. 3.2.1.1.1 Locric levels. A binary “1“ or assertion shall be represented by a positive voltage on the “Hif line with respect to the “Lo“ line. A binary “O“ or negation shall be represe
23、nted by a positive voltage on the “Lo“ line with respect to the “Hirf line. 3.2.1.2 J2 connector sisnal characteristics. Data shall be transmitted and received via frequency-encoded signal circuits. Data will be formatted as a discrete frequency. 3.2.1.2.1 Locric levels. A high shall be represented
24、by a voltage greater than 10.0 Vdc but less than 19.5 Vdc. A low shall be represented by a voltage less than 1.0 Vdc but greater than O Vdc . 3.2.1.2.2 Locric level outwt drive. The VMS modem shall be able to provide the output logic levels of 3.2.1.2.1 when driving a load that consists of a 5.0 k 1
25、0 percent Vdc voltage source in series with 332 k 10 percent ohms and a 1N4148 diode oriented so as to source current only, and also simultaneously driving no more than 0.018 microfarads shunted from the output to ground. 3.2.1.2.3 Loaic level source imDeda nce. The VMS modem shall respond to a sour
26、ce consisting of voltages of 18.0 I1.0 vdc or 0.0 f 0.5 Vdc in series with 33.2 k 10 percent ohms and shunted by no more than 0.018 microfarads to ground producing the logic levels of 3.2.1.2.1. 3.2.1.3 Innut DO wer. The VMS modem normally operates from power supplied in accordance with MIL-STD-275A
27、(ATf. The 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-71074A (AR) operational input voltage range for VMS modem power shall be 18.0 Vdc to 32.0 Vdc. This power shall be applied through 52 pin A with respect to return pin B. 3.2.1.3.1 InDu
28、t current. The VMS modem shall draw 1.2 amps maximum at minimum input voltage of 18.0 vdc and 1.2 amp maximum at maximum input voltage of 32.0 Vdc with the +5 vdc pins (JI-J, K) tied together, the Digital Return pins (Jl-R, S) tied together and a 10 f: 0.5 ohm resistor across the +5 Vdc and the Digi
29、tal Return. 3.2.1.3.2 Power surcre. The VMS modem shall survive a single voltage surge applied to the 18.0 to 32.0 vdc inputs where the voltage increases from an initial value of 23.0 to 32.0 Vdc to its final value for a duration of 45.0 f 5.0 milliseconds. The surge amplitude shall be 1OOV dc maxim
30、um. The surge voltage shall be provided by a supply with an output impedance not to exceed 500.0 milliohms. Surge rise and fall time shall be between 50.0 and 150.0 volts per millisecond. Surge voltage and rise and fall times shall be as stated from the supply before connection of the VMS modem. 3.2
31、.1.3.3 Reverse Dower. The VMS modem shall survive simultaneous negative voltage inputs of up to -32.0 Vdc applied to the 18.0 to 32.0 Vdc inputs for a duration of 5.0 to 15.0 seconds. During the application of the reverse voltage, the VMS modem shall draw a total of less than 100.0 milliamperes from
32、 an external supply - 3.2.1.3.4 Transient Drotection. No damage shall occur to the VMS modem if the input voltage, as defined by MIL-STD-1275A (AT), has a voltage transient of J1-G, H and Jl-T,u output levels according to requirements 1 through 7 of Table II when measured via EIA RS-422 circuits as
33、shown in Figure 1. TABLE II. BIT command remonse. Reut Input State JI-L,M JI-N,P O O 1 O O O O 1 1 1 O 1 O O Note: n/a is not applicable. 3.2.1.8 Transmit freauency caDabilitv. The VMS modem shall be capable of providing the steady state output frequencies within f 3 percent accuracy which meet requ
34、irements 1 through 5 of Table III when measured at the VMS modem transmit data output (J2-Cl. The VMS modem shall also provide the BIT command 1 (J1-E, F), BIT command 2 (J1-G, HI, and loopback outputs (JI-T, U) which meet requirements 1 through 5 of Table III with 6.25 kHz k 3 percent applied to th
35、e VMS receive input (J2-D). 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-71074A M 9Ob L99935 443 J1-A, B J1-C, D J1, N-P J1-L, M Jl-b, c J1-2, a J1-G, H J1-E, F Loopback O , d u P cl -4 O . J1 - - - - - 4- - I rl o .r( J 8- Diff Dwrs Diff
36、Drvrs Diff Dnrrs Diff Rcvrs Diff Rcvrs t5 Vdc Output rl MIL-M-71074A (AR) Square- Wave -b Diff -b + Rcvrs 4 Frequency Generat or - 4 -b Diff + Rmrs + U Encoder Isolator I - Diff - Dnrrs 4 800 use Pulse- Length Generator Voltage Regulator 12 VMS Modem Transmit Data _) VMS Modem Receive Data - +28 Vdc
37、 Input Power - t28 Vdc Return Note: The differential receivers include a 120 ohm termination resistor FIGURE 1. VMS modem interface con f iaurat ion (EIA RS-422 comDatible circuit). 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-V I N 9 I ri 9 P ?
38、 rl b 3 E: 4 b X u I ri 9 h w I d r O d I xxxxx xxxxx DXXXX xoooc xoooc NNNNh TXLcLcZ xxxxyr nmmmlr NNNNPI c m O u -4 -4 u u 3 a 3 L4 O w u o 4 a, a u c V Li a, a O rl +I V ul u C O LI 01 a rl 44 N X ri ri r- O u O II u u O d 0) -4 -l ru tn -4 ul N X x O O ri Li O N T x O m N z x m N rl ai c u c c r
39、: 3 3 a 7 I-) I-) Y N e a, c u u m I-) C a, h a a, R -l 4 m 5 4 m m Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-RIL-N-71074A I 9999906 1999837 216 I HI II I I J1-Z, a J1-Z, a J1-d, 2 J1-b, J1-LI M J1-LI M J1-N-P J1 -N- P J-V, W J1-VI W J1-X, Y J1
40、-X Y I I I? I MIL-M-71074A (AR) I II I I I I II I I II I HI LO I HI II I II I II I Il 0 II I I I I I I I I I I I I I I I I II 1 ,a LO 4 Duration-) I I I I 1 I I I I II I II I II I HI - LO I I I I I I I I I I I I I I I I onse. The BIT command response function of the VMS modem shall be tested as foll
41、ows to verify the requirements of 3.2.1.7. A minimum of 20 measurements shall be made for each delay measurement for requirements 2 through 7. The minimum and maximum readings from those 20 measurements shall be used to determine the minimum and maximum delay. b. (Requirement 1) Set CU BIT 1 (Jl-L,M
42、) to “O“ and CU BIT 2 (Jl-N,P) to “O“ and verify that BIT Command 1 (Jl-E,F) is “O“ and BIT Command 2 (Jl-G,H) is “O“. Verify that Loopback (J-T,U) is II 0 II c. (Requirement 2) Set CU BIT 1 to “1“ and CU BIT 2 to “0“ and verify the output transition and delay of Table II. d. (Requirement 3) Set CU
43、BIT 1 to “O“ and CU BIT 2 to “O“ and verify the output transition and delay of Table II. 23 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-M-71074A W 999990b 1999852 522 MIL-M-71074A (AR) e. (Requirement 4) Set CU BIT 1 to “O“ and CU BIT 2 to “1
44、“ and verify the output transition and delay of Table II. f. (Requirement 5) Set CU BIT 1 to “1“ and CU BIT 2 to “1“ and verify the output transition and delay of Table II. g. (Requirement 6) Set CU BIT 1 to “O“ and CU BIT 2 to “1“ and verify the output transition and delay of Table II. h. (Requirem
45、ent 7) Set CU BIT 1 to “O“ and CU BIT 2 to “0“ and verify the output transition and delay of Table II. 4.7.2.6 Transmit freaue ncv canab ilitv. The transmit frequency function of the VMS modem shall be tested as follows to verify the requirements of 3.2.1.8: a. Apply a 6.25 kHz f 3 percent signal to
46、 the VMS Receive (52- D) input for the entire test. b. (Requirement 1) Set Test 1 (Jl-Z,&) to “1“ and Test 2 (JI- - b,c) to “O“ and verify a continuous 12.5 kHz f 3 percent signal on the VMS Transmit (J2-C) output. Also verify Loopback (Jl-T,U) is u 0 II c. Set both Test 1 and Test 2 inputs to “1“.
47、d. (Requirement 2) Set CU BIT 1 (J-L,M) to “O“ and CU BIT 2 (Jl-N,P) to “O“ and verify a continuous 6.25 kHz f 3 percent signal on the VMS Transmit output. E,F) and BIT Command 2 (Jl-G,H) outputs are “0“. Also verify BIT Command 1 (J1- e. (Requirement 3) Set CU BIT 1 to “0“ and CU BIT 2 to “1“ and v
48、erify a continuous 100 kHz f 3 percent signal on the VMS Transmit output. remain “O“. Also verify BIT Command 1 and BIT Command 2 outputs f. (Requirement 4) Set CU BIT 1 to “1“ and CU BIT 2 to “0“ and verify a continuous 50 kHz f 3 percent signal on the VMS Transmit output. remain “O“. Also verify B
49、IT Command 1 and BIT Command 2 outputs g. (Requirement 5) Set CU BIT 1 to “1“ and CU BIT 2 to “1“ and verify a continuous 25 kHz f 3 percent signal on the VMS Transmit output. remain “O“. Also verify BIT Command 1 and BIT Command 2 outputs 4.7.2.7 Receive freauencv caDabilitv. The receive frequency function of the VMS modem shall be tested as follows to verify the requirements of 3.2.1.9: 24 Provided by IHSNo
