401-943-1164 / US & Canada Toll Free: 877-943-1164

300900 - 900 EIA/TIA RS-530 Interface Analyzer

    EIA/TIA RS520 nterface Analyzer
Click image to enlarge
Base Price:
Catalog No: 300900
Model No: 900
Description:Supports EIA/TIA RS-530 and EIA/TIA RS-530-A
Display:All EIA/TIA RS-530/530-A interface signals
Feature:Red & Green LED's display polarity, activity, and validity of all interface signals
Interface:EIA/TIA RS-530 Interface
Application:Testing EIA/TIA RS-530 Data Interface
Ruggedized:Virtually indestructable


Shipping Terms

Shipments are made via UPS Ground, unless otherwise specified. Freight charges are prepaid and added to your invoice. We can estimate the freight costs for you.

We can ship freight collect on your account, just provide your UPS Account Number.

We can also ship via the carrier of your choice. Provide the details and your account number.

Products shall be shipped F.O.B. Electro Standards' facility. Title to and risk of loss or damage to the products shall pass to you upon Electro Standards delivery of the products to a carrier for shipment. Title to software will remain with the applicable licensor. Electro Standards' prices do not include shipping and handling charges. Electro Standards reserves the right to use its own discretion in the manner and routing of shipments. Electro Standards shall be permitted to deliver products in separate lots.

Shipping Return Policy

  • To return an item, contact Electro Standards at 401-943-1164 to obtain a Return Material Authorization (RMA) number. RMA numbers are valid for 30 days after the date of the shipment and cannot be extended or re-issued. We are unable to accept returns without an RMA number.
  • All returns except those of defective product are subject to a 15% restocking fee, and additional charges for handling or freight are refunded only in cases of defective products.
  • Return freight must be shipped prepaid. We recommend that you insure the package as you are responsible for risk of loss on all returned packages. We recommend that all cartons are properly packed as Electro Standards is not responsible for product damaged en route. We do not issue call tags for product returns.
  • Returned product must be clean, undamaged, and complete with all manuals, accessories, documents and packaging. The items must be in a resalable condition.
  • The product must have with it a copy of the original invoice or packing slip and the appropriate RMA paperwork.
  • If your item is not working properly, please contact Electro Standards at 401-943-1164 for help in trouble-shooting your application.
  • If the product is defective, Electro Standards will repair or replace that item (at our discretion) upon receipt and evaluation of the original product.
  • Electro Standards reserves the right to authorize product returns after 30 days from the invoice date in some cases. If the product is accepted after 30 days, credit will be issued toward future pruchases only and some additional restocking charges may be applied.
  • All credits from RMAs must be used within one calendar year of issue.

Ask a Question

Protected Document Request


Model 900 EIA/TIA RS-530 Interface Analyzer
LED's Display Red, Green & Off to Indicate Signal Status

  • Easy to use; plug and play
  • Easy determination of proper data cable design
  • Ask about DB9 EIA/TIA RS-422 and EIA/TIA RS-485 adapter kit

ESL Breakout Boxes / Interface Analyzers are Made in the USA.

The Model 900 EIA/TIA RS-530 Interface Analyzer is a diagnostic tool designed for use at the standard EIA/TIA RS-530 data interface of modems, multiplexers, terminals, and computers. It is simply inserted in series between the DTE (Data Terminal Equipment) and the DCE (Data Communications Equipment) to provide access to and monitoring of all data, timing and control signals.

The Model 900 is of optimum design. It utilizes red and green light emitting diodes to clearly display polarity, activity, and validity of all interface signals. Miniature slide 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/TIA RS-530/530-A standard interface signal descriptions is provided inside the unit for ready reference during testing. A covered compartment provides secure storage for mini-patchcords and an EIA/TIA ribbon cable. The Model 900 is battery powered for complete portability, pocket sized for convenience, and packaged in a sturdy aluminum case with metal hinge for durability in field use.

EIA/TIA 530/530-A Serial Interface signal chart


The Model 900 utilizes red and green light emitting diodes to indicate the status of key signals at the EIA/TIA data interface.  The use of red and green indicators allows the maximum efficient monitoring of bipolar interface signals. They present the user with the maximum of signal status information.

Model 900 LED Table / Red/Green LED Display


  • Logic face plate utilizes red and green LED's to clearly display polarity, activity, and validity of all interface signals
  • Displays all EIA/TIA RS-530/530-A interface signals
  • Supports EIA/TIA RS-530 and EIA/TIA RS-530-A
  • Separate EIA/TIA cable facilitates use at either DCE or DTE end
  • Test points to access all 25 pins of both DCE and DTE connector
  • Can be utilized to determine custom cable designs
  • Portable: lightweight, pocket-sized, battery powered
  • External power supply optional. (Cat No. 527205R)
  • Rugged aluminum case and metal hinge that will NOT break
  • Tests synch or asynch modems, terminals, muxes
  • Eight mini-patchcords provided for cross-patching or loopback patching of signals at front panel test point array
  • Miniature slide switches allow the user to program a 'make' or 'break' for each signal at the DCE/DTE interface
  • DB25 ribbon extension cable conveniently permits installation into any application
  • Comprehensive User's Manual 
  • The Model 900 is available on our GSA Schedule #GS35F0286V to US State, Local, and Federal Government Purchasers.

Model 900 EIA/TIA RS-530 Interface Analyzer / Breakout Box Application Diagram


  • Input Signal: /-12V per EIA/TIA RS-422/485
    • B – A < –0.3 = Red indication ("SPACE") 
    • B – A > 0.3 = Green indication ("MARK")
    • A: Inverted (–); B: Non-Inverted ( ) 
  • LED Circuit Input Impedance: Exceeds 120 ohm termination 
  • Operating Temperature: 0°C to 50°C
  • Storage Temperature: –40°C to 90°C
  • Humidity: 10% to 90% without condensation
  • Size: 4.0" x 5.25" x 1.75" (10.2 x 13.3 x 4.5 cm)
  • Weight: 1.1 lb (501.5 grams)
  • Power: Two 9V, batteries
  • Display: (15) Red and (15) Green LED indicators
  • Test Points: 49 test points access all 25 pins on both DTE and DCE connector; One pair spare LED access test points; One set of three voltage test points (V–) (0V) (V ). 
  • Switches: 8 double pole, 8 single pole mini-slide switches for on-off control of all signals between DTE and DCE.
  • EIA/TIA RS-530/530-A selector slide switch
  • I/O Connectors:
    • TO DCE, a 25-pin EIA/TIA socket.
    • TO DTE, a 25-pin EIA/TIA plug.
  • Cables & Patchcords:
    • One 10-inch EIA/TIA cable.
    • Six single (1-to-1) mini-patchcords.
    • Two triple (3-to-1) mini-patchcords.
  • EIA/TIA RS-530/530-A Serial Interface Label:
    Attached to upper panel. Describes relationship between EIA/TIA RS530/530A Signal Nomenclature, and Signal Source.
  • Package: Aluminum case, metal hinge and clasp. Storage compartment for cable and mini-patchcords. Scuff-proof.

Model 900 Inside View showing the RED and GREEN LED's, and labeling.

The Model 900 is powered by two 9-volt batteries that are housed within the unit. The Model 900 may also be powered by an external DC power supply that is offered as an option. (See
Cat No. 527205R on Accessories Tab).

The included 9-volt batteries will provide 30 plus hours of use. The POWER switch must be turned ON in order to operate the unit. When not operating the Model 900, the POWER switch must be turned OFF in order to prevent battery drainage. Additional 9-volt batteries can be ordered, Cat No 525914.

(Cat No 527205R)
CE, RoHS, and UL listed table mount power module, 100VAC/240VAC, 50Hz/60Hz supplies 9 VDC to the unit. Has IEC 60320 C14 inlet. Ideal for international applications.

Note: When this external power supply module is used to power the Model 900, the batteries will automatically be disconnected in order to extend battery life.

Model 900 is available to government purchasers on our GSA Schedule GS-35F-0286V. Call for discounted price and terms, or click here.

*Prices online are subject to change and verification.
All ESL products are available for export.

Customers Who Bought This Also Bought

Available Combo Deals