Model 700 EIA RS-232 Interface Analyzer
Contents
1. TO DCE A 25 pin ElA RS 232 connector provides connector to Data Communications Equipment socket TO DTE A 25 pin ElA RS 232 connector provides connector to Data Terminal Equipment plug Cables amp Patchcords EIA A ten inch long male female EIA ribbon cable for connection to DCE or DTE Patchcords Three single 1 to 1 patchcords and one triple 3 to 1 patchcord for use with test points EIA CCITT Modem Terminal Interface Label A convenient chart for reference during testing Describes relationship between EIA CCITT Signal Nomenclature Signal Source Packaging Durable aluminum case with metal hinge and clasp Storage compartment for EIA cable and patchcords Scuff proof coated Attractively styled SHIPPING AND STORAGE When shipping or storing the unit be sure to remove batteries MAINTENANCE The Model 700 is a solid state device utilizing reliable computer circuitry It requires no tuning or adjustments There is no calibration needed Routine maintenance is the replacement of batteries as may be required Repairs should be made at the factory For maximum efficiency and quick repair turnaround call the factory for a return authorization number and shipping instructions You will be requested to supply your name phone number purchase order number and a return ship to address for the repaired unit Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 22 Pub2. Electro Standards Laboratories ADVANCED SYSTEMS DESIGN amp SERVICES ESL Model 700 ElA RS 232 Interface Analyzer Cat No 301030 The Tri State Box User s Manual 36 Western Industrial Drive Cranston 02921 Tel 401 943 1164 www electrostandards com Pub 2903 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Use and Installation Manual Model 700 ElA RS 232 INTERFACE ANALYZER The Tri State Dynamic Tri State Led s Display Red Green amp Off To Indicate Signal Status Completely portable Lightweight Pocket Sized Battery Powered Rugged Aluminum Case And Metal Hinge That Will Not Break Tests Synchronous Or Asynchronous Modems Terminals Multiplexers 24 Mini Switches 4 Mini Patchcords Comprehensive User Manual Displays All Modem amp Terminal Interface Signals Compatible With EIA RS 232 CCITT V 24 And MIL 188C Separate EIA Cable Facilitates Use At Either Modem OR Terminal End Test Points To Access All 25 Pins Of Both DCE And DTE Connector Can Also Be Utilized To Determine Custom Cable Designs REPRODUCTION AND DISTRIBUTION OF THIS TECHNICAL MANUAL IS AUTHORIZED FOR GOVERNMENT PURPOSES Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 1 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 2 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE AN
3. They are connected directly to the 25 pins on the TO DCE connector and are labeled 1 through 25 There are 24 additional test points on the left half of the front panel They are connected directly to their respective pins on the TO DTE connector and are labeled 2 through 25 Since pin 1 is chassis ground which is bussed through the test point labeled 1 is actually connected to pins 1 on both the TO DCE and TO DTE connectors There is a spare test point LED circuit to allow any signal pin with or without a dedicated LED to be monitored for signal activity There is a set of two voltage test points positive and negative that provide the ability to apply test signals onto the other signal test pins of the interface The test points usage is multi fold They serve as access points for signals that are being passed between DCE and DTE But when the respective rocker switch is programmed to interrupt the signal the test points serve as a signal pickup point or a signal injection point In order to accomplish this mini patchcords are supplied A signal may be picked up at one test point that is connected to the signal source and injected at another test point that is to be the signal s new destination This process is called cross patching or simply patching Application examples appear in following sections of this manual Electro Standards laboratories Inc 401 943 1164 www electrostandards
4. all interface signals Test Results TD and RD indicators are mixed red green signifying transmit data activity is being looped back as receive data RTS and CTS indicators are green signifying RTS is being used to supply the CTS signal 10 DSR and DTR indicators are green signifying DTR is being used to supply the DSR signal Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 18 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Testing A Modem A modem accepts digital data from the terminal or computer modulates it and transmits the analog signal comprised of a modulated carrier over phone lines At the far a second modem detects the carrier and modulation demodulates the signal and restores the data to its digital form for use by the terminal at that end of the data link A crucial ingredient in this process is the detection of carrier by the receive modem Without carrier there is no data transmission In this test we cause the local modem to transmit a carrier Modem level adjustments can be made at this time See Figure 5 To Computer or Terminal Triple Patchcord Ties Pin 6 4 amp 20 Single Ties 2 amp 5 S Space M Mark Figure 5 Testing a Modem Test Procedure 1 Disconnect data cable from modem 2 Plug Model 700 ribbon cable into its TO DCE connector and the other end into the modem 3 Use the triple mini patchcord to tie test
5. com pg 13 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER If a signal is to be patched from one test point to another a single or 1 to 1 mini patchcord is used If a signal is to be patched from one test point to two or three other test points a triple or 3 to 1 mini patchcord is used Mini patchcords are stored in the covered compartment Mini patchcords are illustrated in Figure 1 Single 1 1 Triple 3 1 Figure 1 Single and Triple Mini Patchcords Connectors amp EIA Ribbon Cable The TO connector on the Model 700 is a socket female 25 pin EIA RS 232 socket The TO DCE connector is a plug male 25 pin EIA RS 232 plug A pin signal list for the EIA RS 232 and CCITT V 24 data interface is given in Table 1 Socket view and Plug view of the 25 pin EIA RS 232 connectors are illustrated in Figure 2 Socket Pin Arrangement Plug Pin Arrangement 14 25 Ses o000008 123 1213 Figure 2 Socket and Plug Views of ElA RS 232 Connectors A 10 inch ribbon cable is supplied to facilitate connecting the Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 14 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Model 700 to either the modem or terminal Applications are illustrated in later text The EIA ribbon cable is stored in the covered compart
6. points 6 DSR 4 RTS and 20 DTR together 4 Place a mini patchcord between DTE test points 2 TD and 5 CTS This places a Space signal on the Transmit Data line 5 Program all switches to ON Monitor circuits will indicate status of all interface signals Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 19 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Test Results 1 RTS and CTS indicators are green 2 The modem 15 transmitting carrier 3 The modem will transmit a Mark when switch 2 is programmed OFF open circuit and will transmit a Space when switch 2 is programmed ON Monitoring the ElA CCITT Interface At Tech Control Center Tech control center switch patch and monitor modules often have a monitor port on their front panel That access point may be patched directly into either connector of the Model 700 to allow monitoring the status of all interface signals Test Procedure 1 Use patch panel monitor connector to ElA connector adapter cable and patch directly from tech control module to Model 700 2 Program all Model 700 switches to On Test Results 1 All interface signals will be monitored and signal status displayed on the tri state LED s SPECIFICATIONS Input Signal 25 volts per ElA RS 232 More positive than 2 5 volt for green indication More negative than 2 5 volt for red indication Input Impedance Greater than 30 K ohms En
7. 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER For self repair see the Maintenance and Service Manual WARRANTY The Model 700 is guaranteed against defects in material and workmanship for a period of one year after receipt by original purchaser Under this warranty defective equipment will either be repaired or replaced the option of ESL Units returned to factory for repair must be shipped prepaid Shipping and handling charges for the return of repaired equipment shall be prepaid by ESL and billed to the customer Replacement of batteries is not covered by this warranty Authorization for return of equipment for repair must be obtained prior to sending equipment to the factory Liability under this Warranty is limited to the replacement value of the Model 700 The Warranty is voided if the unit is not operated in accordance with the instruction manual or ESL application notes Unauthorized modification or repairs of the unit may void the warranty at the discretion of ESL O September 14 2010 Electro Standards Laboratories All rights reserved NN 2 Electro Standards Laboratories ADVANCED SYSTEMS DESIGN amp SERVICES 36 Western Industrial Drive Cranston RI 02921 Tel 401 943 1164 Fax 401 946 5790 E mail eslab ElectroStandards com Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 23 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Electro Standards
8. ALYZER A OS 7 INTRODUCTION 9 PURPOSE AND FUNCTION broens ea iE a EE ERE PERFORMANCE CHARACTERISTICS AND CAPABILITIES UNPACKING ITEMS FURNISHED INSTALLATION PRINCIPLES OPERATION 1 2 1 1 CONTROLS AND 8 1200200 2 1 1 0 001 ERTER R A 11 Tri State Indicators dl SWHCNES at it 13 Test Points amp Mini Patchcords Connectors amp EIA Ribbon 14 OPERATING INSTRUCTIONS c ccsscsssscssscessscsssscssscssscssssscnessnese 15 GENERA tido fondo Ando MONITORING THE EIA CCITT MODEM TERMINAL INTERFACE sald Test Procedures cars 2 15 Test Procedure 16 Test RESULES cs 16 LOOPING BACK DIGITAL DATA AT THE MODEM ASYNCHRONOUS 17 a aN ed RO 17 Test Results 18 LOOPING BACK DIGITAL DATA AT THE TERMINAL ASYNCHRONOUS 18 TestProcedure ista Dio AR do ae eat TESTING A MODEM Pro cad cia Test Result 20 MONITORING THE EJA CCITT INTERFACE AT TECH CONTROL CENTER 20 Test Procedure a 20 Tar aia 20 SPECIFIC
9. ATIONS 20 SHIPPING AND STORAGE o ccccconocononccooconncconoconocconoconnccnoccncocconaccnnoconos 22 MAINTENANCE done de ceda socias 22 divs atra asso ce 105016600666 23 Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 3 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER The Tri State Box ESL Model 700 Modem amp Terminal Interface Pocket Analyzer Dynamic Tri State LED s Display Red Green and a Mixture Orange For Accurate Datacomm Testing The unique Model 700 ElA RS 232 Interface Analyzer utilizes tri state LED s to clearly display polarity activity and validity of all key interface signals simultaneously Compact and battery powered ideal for computer room use or field service use Electro Standards Laboratories ADVANCED SYSTEMS DESIGN amp SERVICES Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 4 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER samar sir MODEL 700 EIA RS 232 INTERFACE ANALYZER m TD Go ON_OFF 0 22 RD 4 OUT a T 00 9 Model 700 Front Panel Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 5 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Electro Standards la
10. D SBB 119 SECONDARY RECEIVE DATA E 17 RC DD 115 RECEIVE CLOCK E 18 UNASSIGNED 19 SRTS SCA 120 SECONDARY REQUEST TO SEND E 20 DTR CD 108 2 DATA TERMINAL READY E 21 SQ 110 SIGNAL QUALITY DETECT E 22 Ri CE 125 RING INDICATOR 23 CH CI 111 112 DATA RATE SELECTOR 24 SCTE DA 113 SERIAL CLOCK TRANSMIT EXTERNAL 25 BUSY BUSY TRI STATE LED DISPLAY 2 RED ONE OFF GREEN ZERO ON BETWEEN 3V amp 3V OR IMPROPER SIGNAL OFF OPEN CIRCUIT 7 amp a y ES 2 ASES S Table 1 Tri State LED Display and Data Interface Electro Standards laboratories Inc www electrostandards com pg 12 401 943 1164 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Switches The Model 700 utilizes 24 miniature rocker switches to allow any of the interface signals except frame ground to be interrupted A rocker switch in the ON position is programmed to pass the signal between the DCE and DTE connectors A rocker switch in the OFF position is programmed to interrupt the signal between the DCE and connectors Switches are identified by the test points adjacent to them They are numbered in order from top to bottom pins 2 through 25 Test Points amp Mini Patchcords There are twenty five test points on the right half of the front panel
11. boratories Inc 401 943 1164 www electrostandards com pg 6 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER SAFETY e sure to clear case of all obstructions when closing Do not attempt to store an excessive amount of items in the storage compartment e When installing batteries pay close attention to insert batteries according to the battery polarity diagram located on the inside of the battery compartment e When using jumper wires from test points be careful not to short signals to the chassis Also take care not to connect ground positive voltage and negative voltage together Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 7 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 8 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER INTRODUCTION Purpose and Function The Model 700 ElA RS 232 Interface Analyzer is a diagnostic tool designed for use at the standard ElA RS 232 or CCITT V 24 data interface of modems multiplexers terminals and computers It is simply inserted in series between the Data Terminal Equipment DTE and the Data Communications Equipment DCE to provide access to and monitoring of all data timing and control signals The unit is of optimum design utilizing state of the art tri state light emitting diodes to clearly display polarity activity an
12. d validity of all interface signals Miniature rocker switches allow the user to program a make or break for each signal at the DCE DTE interface Mini patchcords are provided for cross patching or loopback patching of signals at the front panel test point array A complete table of EIA CCITT standard interface signal description is provided inside the unit for ready reference during testing A covered compartment provides secure storage for mini patchcords and an EIA ribbon cable The unit is battery powered for complete portability pocket sized for convenience and packaged in a sturdy aluminum case for durability in field service use The Model 700 s high utility and versatility at an economical price make it a must for every data communications user Performance Characteristics and Capabilities Large Tri State Red Green Off LED Display e AMARK signal is displayed in RED e A SPACE signal is displayed in GREEN e Clock activity is displayed as mixed RED amp GREEN ORANGE e DATA activity is displayed as mixed RED amp GREEN ORANGE Illegal level or open circuit is displayed as OFF Location of LED s on panel indicate signal source Fourteen tri state LED s including a spare Exclusive SCTE monitor for external timed modems Full Access To All Interface Signals Via Test Points e Test Points for all 25 DCE and 25 connector pins Electro Standards laboratories Inc 401 943 1164 www electrostandards co
13. he DCE and DTE If at the DCE end Disconnect the data cable from the DCE device and plug into the Model 700 connector labeled DTE Then plug the Model 700 ribbon cable into its connector labeled To DCE and plug the other end of the ribbon cable into the DCE device If at the DTE end Disconnect the data cable from the DTE device and plug it into the Model 700 connector labeled TO DCE Then plug the Model 700 ribbon cable into its connector labeled TO DTE and plug the other end into the device Test Results 1 TD and RD indicators should be in a mixed red and green state signifying Transmit Data and Receive Data activity 2 DTR and DSR indicators should be in the green state signifying both terminal and modem are ready for the data activity 3 RTS and CTS indicators should be green when the DTE is transmitting data signifying that the terminal has requested carrier for its transmission and sufficient time has passed for the link to have settled on the carrier to accept data 4 DCD indicator should be green when receiving data signifying the detection of a carrier by the local modem 5 and RC indicators should be mixed red and green for synchronous modems indicating the presence of the Transmit Clock and Receive Clock respectively An exception to this occurs when the modems are of the externally timed type 6 For synchronous externally timed modems the RC and SCTE indicators sh
14. he terminal but synthesized from modem signals via the mini patchcord strapping arrangement Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 17 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Test Results 1 TD and RD indicators are mixed red green signifying receive data activity is being looped back as transmit data DSR and DTR indicators are green signifying DSR is being used to supply DTR signal DCD indicator is green signifying that a proper carrier 15 being detected by the local modem At the far end modem data being transmitted to the local modem 15 being received RD Looping Back Digital Data At The Terminal Asynchronous Data from a terminal or computer may be looped back to facilitate testing that device Test Procedure 1 2 the ElA data cable at the terminal end and set it aside Plug one end of the Model 700 s ElA ribbon cable into the front panel TO DTE connector and the other end of the ribbon cable into the terminal or computer s data connector Place a mini patchcord between test points 2 and 3 looping data Place a mini patchcord between test points 4 and 5 This uses RTS to satisfy the terminals requirement for a CTS signal Place a mini patchcord between test points 6 and 20 This uses to satisfy DSR signal requirement Program all switches ON Monitor circuits will indicate status of
15. laboratories Inc 401 943 1164 www electrostandards com pg 24 Pub 2902 03 A Electro Standards Laboratories ADVANCED SYSTEMS DESIGN 4 SERVICES 36 Western Industrial Drive Cranston 02921 Tel 401 943 1164 www electrostandards com Pub 2903 03
16. m pg 9 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER e Provide means of cross patching or loopback of signals e Ample supply of mini patchcords Twenty four Miniature Switches e Provide capability to program each signal for make or break e Switches facilitate break and patch operation Easily Inserted In At Data Interface Between DCE and DTE e Reliable panel mounted connectors to both DCE and e Separate EIA ribbon cable allows application at either DCE or DTE end of data cable e Data cable and mini patchcord storage compartment provided Complete ElA CCITT Modem Terminal Interface Chart e Located on inside panel for easy reference Interfaces With All Modems and Terminals Indicators buffered to prevent loading interface signals Full duplex and half duplex monitoring Synchronous or asynchronous applications Compatible with EIA RS 232 V 24 MIL 188C For Field Service Or Data Center Use e Rugged aluminum case with sturdy metal hinge and latch e Completely portable and battery powered e Lightweight and pocket sized Economical Low Priced High Capability Unpacking Each unit is thoroughly inspected and tested before shipment Upon receipt the user should inspect it for shipping damage If any shipping damage is suspected refer to the Maintenance section of this manual The serial number of the unit is on the battery tag located in the storage compartment Refer to this serial number in all correspo
17. ment OPERATING INSTRUCTIONS General A few basic yet powerful applications are presented to illustrate usage and versatility of the Model 700 EIA RS 232 Interface Analyzer Customizing a test for the user s specific application may occasionally be necessary The user is encouraged to document test configurations that he determines to be most effective in fault isolation activity for his particular network configuration Monitoring The ElA CCITT Modem Terminal Interface In this popular application signals at the DCE DTE interface are monitored to present the user with a simultaneous view of data timing and control signal activity Often with this single test the user will recognize the absence or out of sequence occurrence of a required handshake signal and pinpoint the cause of a previously elusive problem The Model 700 will be placed in series with the data cable connecting the Modem and Terminal per the following procedure See Figure 3 Terminal Model 700 ElA RS 232 Interface Analyzer Figure 3 Model 700 in Series with Terminal 8 Modem Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 15 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Test Procedure 1 Program all switches to the ON position 2 Remove any jumpers that may be in test points from previous tests 3 The Model 700 may be inserted in series at either end of the data cable connecting t
18. mixture of red and green signifies data transitions For clock signals Transmit Clock Receive Clock and Serial Clock Transmit External a mixed red and green indication signifies the presence of an active clock a red indication signifies that the clock line is more negative than 3 volts a green indication signifies that the clock line is more positive than 3 volts an off indication signifies an improper signal between 3 volts and 3 volts or an open circuit summary of the tri state LED display indications is presented in Table 1 Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 11 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER MODEM TERMINAL INTERFACE PIN NAME ElA SIGNAL SOURCE DTE DCE 1 PG AA 101 PROTECTIVE GROUND Es 2 TD BA 103 TRANSMIT DATA E 3 RD BB 104 RECEIVE DATA E 4 RTS CA 105 REQUEST TO SEND DATA E 5 CTS CB 106 CLEAR TO SEND 6 DSR 107 E 7 102 SIGNAL GROUND 8 DCD CF 109 DATA CARRIER DETECT E 9 POS POSITIVE DC TEST VOLTAGE E 10 NEG NEGATIVE DC TEST VOLTAGE E 11 UNASSIGNED p 12 SDCD SCF 122 SECONDARY DATA CARRIER DETECT 13 SCTS SCB 121 SECONDARY CLEAR TO SEND 14 STD SBA 118 SECONDARY TRANSMIT DATA E 15 TC DB 114 TRANSMIT CLOCK E 16 SR
19. ndence with the factory or distributor sales representative Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 10 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Items Furnished 4 size AA batteries ten inch long EIA Male Female ribbon cable 1 3 to 1 mini patchcord 3 1 to 1 mini patchcords 1 flat head screwdriver Use and Installation manual provided both as a hard copy and on CD e Maintenance and Service manual provided both as a hard copy and on CD Installation Before the unit can be operated power must be supplied either by 4 AA batteries or by a DC power source When installing batteries be sure the polarity of the batteries is correct per the label inside the unit Once powered the unit is ready for operation PRINCIPLES OF OPERATION Controls and Indicators Tri State Indicators The Model 700 utilizes state of the art tri state light emitting diodes to indicate the status of key signals at the EIA CCITT data interface The use of tri state indicators represents an advancement in interface monitoring technology They present the user with a maximum of signal status information Interpretation of the display is as follows For data signals Transmit Data and Receive Data a red indication signifies a Mark condition a green indication signifies a Space condition an off indication signifies an improper signal between 3 volts and 3 volts or an open circuit A
20. ould be mixed red and green indicating the presence of Receive Clock and Serial Clock Transmit External respectively 7 The SPARE indicator may be patched via its test point input to any test point at the ElA interface that may not have a dedicated LED Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 16 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Looping Back Digital Data At The Modem Asynchronous Frequently network testing requires looping back the data at the local modem s digital interface to facilitate a test initiated from the far end modem or terminal This requires disconnecting the local terminal from the modem and replacing it with the Model 700 per the following steps See Figure 4 Patchcord from Pin 3 to 2 for Data Loopback Figure 4 Digital Loopback Test Test Procedure 1 Disconnect the EIA data cable at the modem end and set it aside Plug one end of the Model 700 s ElA ribbon cable into the front panel TO connector and the other end of the ribbon cable into the modem s data connector Place a mini patchcord between DCE test points 2 and 3 This loops RD back as TD Place a mini patchcord between DCE test points 6 and 20 This uses DSR to satisfy the modem s requirement for a DTR signal Program all switches ON This allows monitor circuits on the DTE side of the Model 700 to indicate status of signals normally supplied by t
21. vironment Operation Temperature 00 to 500C Storage Temperature 400C to 900C Humidity 10 to 90 without condensation Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 20 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Size Length 4 0 in 10 16 cm Width 5 25 in 13 33 cm Height 1 75 in 4 45 cm Weight 15 ounces 426 grams Power Four 1 5 volt size AA batteries Test Points A total of 50 test points providing access to all 25 pins on the DCE connector all 25 pins on the DTE connector and one for access to the spare LED A pair of signal voltage test points positive and negative allowing test signal to be applied to interface test points Switches 24 miniature rocker switches provide individual ON OFF control of signals passing through between the DCE and connectors Display Fourteen Tri state LED Red Green Off Indicators Pin Signal 2 TD Transmit Data 3 RD Receive Data 4 RTS Request to Send 5 CTS Clear to Send 6 DSR Data Set Ready 8 DCD Data Carrier Detect 15 TC Transmit Clock 17 RC Receive Clock 20 DTR Data Terminal Ready 21 SQ Signal Quality 22 RI Ring Indicator 24 SCTE Serial Clock Transmit Ext 25 Busy Busy SPARE Uncommitted Electro Standards laboratories Inc 401 943 1164 www electrostandards com pg 21 Pub 2902 03 MODEL 700 MODEM 8 POCKET INTERFACE ANALYZER Connectors
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