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Allen-Bradley 2755-DS1A Product Data

Allen-Bradley 2755-DS1A Product Data

Single/dual-head enhanced bar code decoders
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Single/Dual-Head
Enhanced Bar Code Decoders
(Catalog No. 2755-DS1A,-DS4A,-DD1A,-DD4A)
Series B
Product Data
Overview. The Enhanced Bar Code Decoders are available in a variety of
configurations providing application flexibility. For example, the
single-head decoders (Catalog No. 2755-DS1A or -DS4A) have one scanner
port while the dual-head decoders (Catalog No. 2755-DD1A or -DD4A) have
two. Plus, each decoder is available in a NEMA Type 1 or Type 4 enclosure.
Other options available for each decoder include:
LCD Display
I/O Module Board supporting up to eight output modules
You can order these options with the decoder or as separate components for
customer installation.
In addition, Allen-Bradley offers a full line of accessories to support the
decoders including scanners, package detectors, and cables.
A–B
ALLEN-BRADLEY

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Summary of Contents for Allen-Bradley 2755-DS1A

  • Page 1 I/O Module Board supporting up to eight output modules You can order these options with the decoder or as separate components for customer installation. In addition, Allen-Bradley offers a full line of accessories to support the decoders including scanners, package detectors, and cables.

  • Page 2: Decoder Features

    POWER SCANNER B Port AUX Port HOST Port (DD Versions Only) RS-232 RS-232/422 &485 w/DH485 Protocol SCANNER A Port ALLEN-BRADLEY BAR CODE DECODER Optional LCD Display DISCRETE I/O POWER LASER ON A LASER ON B LED Indicators 1 2 3 4 5 6 7 8...

  • Page 3: Scanner Ports

    (see Accessories section). The scanners do not require a separate power supply; they receive power directly from the decoder. The NEMA Type 1 version of each decoder also supports all of the Allen-Bradley stop and scan Visible Laser Diode (VLD) fixed mount and hand-held scanners when used with the 2755-NC16 gun adapter.

  • Page 4: Power Supply

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Power Supply An internal power supply provides power to the scanners and the decoder. The source voltage may range from 100 to 240 volts AC nominal (50 to 60 Hz). The power supply automatically adjusts to the input voltage. LED Indicators Front panel indicators provide a visual indication of the operating status of the decoders.
  • Page 5 HOST Port The HOST port supports RS-232, RS-422, and DH485 (Allen-Bradley multidrop interface). The HOST port allows the exchange of commands and data between the decoder and a host computer or Allen-Bradley PLC controller. Power Connector and On/Off Switch The NEMA Type 1 decoder uses an IEC 320 power entry connector.

  • Page 6: Memory Backup

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Discrete I/O Modules The decoders support an optional I/O Module Board (eight positions for outputs with one position alternately accepting an input). With the optional I/O modules, the decoder can be used to control external AC or DC devices. Conditions that activate the outputs are under user control via the configuration screens or host commands.

  • Page 7: Decoder Functions

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Decoder Functions The decoder acquires and decodes bar code data from one or two scanners. The decoder can then: send the decoded data to a host device (computer, PLC or SLC), ASCII terminal, or LCD display apply Host Replacement Rules to incoming data, and send the result to a host device...
  • Page 8 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Decode Modes The Single and Dual-Head Decoders have three decode modes: Continuous Mode In continuous mode, the decoder attempts to decode every scan. Continuous mode is useful during initial setup to determine the optimum location of the scanner relative to the bar code labels.

  • Page 9: Configuration Screens

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders At End of Trigger This response mode sends decoded data to the discrete I/O and host when: Host sends the stop scan character or Package detect signal expires or No-read timer expires. This response mode is useful when timing of the discrete outputs or timing of host communications is critical.
  • Page 10 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Select CRT (Terminal) Type Screen From this screen, you select the type of terminal connected to the decoder. Select Operation Menu The Select Operation screen is the main menu. From this screen, you select the operation you want to perform.
  • Page 11 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Configure Symbology Option 1 on the Select Operation menu accesses the Symbology configuration screen. Use this function to select symbologies for decoding and to define the operating parameters to use during decoding. Symbology/Length Checking Enable and disable symbologies for decoding, and help assure data integrity and optimum...
  • Page 12 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Discrete I/O Conditions The Primary Match Code Counters and Outputs are triggered by a number of different events or conditions. These include: Verifying that a symbol or group of symbols was read or failed to be read Read or No-Read.
  • Page 13 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Extended Match Table and Counters You can use the screen illustrated that follows to set up match code entries in the Extended Match Code Table. You can define up to 128 entries here that provide added flexibility in response to incoming data over the Primary Match Codes described in the previous chapter.
  • Page 14 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders AUX and LCD Display Parameters The decoder can display the following on an auxiliary terminal or an optional 2 line x 20 character per line alphanumeric LCD display to monitor: bar code data output counters decoder performance values host messages...
  • Page 15 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Host Message Replacement Rules Function 5 on the Select Operation menu accesses the Host Message Replacement Rules configuration screen. Use this function to modify the message sent to the host. Rule Status Each number represents an available host message replacement rule.
  • Page 16 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Metacharacters The decoder provides a complete set of special purpose characters you can use to perform logical functions on characters, expressions, or even entire strings. These characters are known as metacharacters. Metacharacters are string manipulation commands consisting of standard ASCII characters which you can embed within search or replacement strings.
  • Page 17 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Table 3 Search Pattern Metacharacters – Logical Operators and Other Special Functions Character Description and Use Square brackets ( [ ] ) instructs the rule to match an incoming string if any character enclosed within the brackets appears in the string.
  • Page 18 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Table 4 Replacement String Metacharacters Character Description and Use The backslash plus a number 1 through 9 recalls a previously saved string. Any character, string or expression that is surrounded by parentheses in the search pattern (as described earlier) can be recalled by the replace pattern using the “\n”...
  • Page 19 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Examples of Host Message Replacement Rules Example 1: Sorting the Host Message Contents by the Source of Data Parameter Rule #1 Value Rule #2 Value Source A Symbology Any Symbol Number All Find String Containing .* Replace Entire String With &...
  • Page 20 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Example 3: Sorting by Symbology By setting up specific rules to check for symbology, different code types may be sent to the host in a predetermined order. Parameter Rule #1 Value Rule #2 Value Source A|B Symbology Code 128...
  • Page 21 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Example 5: Sorting Symbols by Data Identifiers Parameter Rule #1 Value Rule #2 Value Rule #3 Value Rule #4 Value Source A|B Symbology Any Symbol Number All Find String ^P( ..)$ ^Q( .
  • Page 22 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Example 6: Sorting by Unique Characters and/or Strings Parameter Rule #1 Value Source A|B Symbology Any Symbol Number All Find String Containing ^6[2–9] | ^[7–9][0–9]$ Replace Entire String With & Minimum Field Length 0 Alignment Right Fill Character None Host Message Field Number 1...
  • Page 23 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Example 8: Stripping Unwanted Characters Parameter Rule #1 Value Source A|B Symbology UPC-A Symbol Number All Find String Containing ^( ..)(. * ) Replace Entire String With \2 Minimum Field Length 0 Alignment Right Fill Character None...
  • Page 24 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Host Message Format Function 6 on the Select Operation menu accesses the Host Message Format configuration screen. Use this function to configure the message format of bar code data sent to the host. Host Message Parameters These settings control the message format of bar code data sent to the host.
  • Page 25 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Figure 3 Bar Code Host Message Format ASCII BAR CODE DATA 12. Transmission Check (0 to 2) 11. End Message (0 to 3) 10. Performance Indicators. (0 or 6) 9. Package Count (0 or 6–DD, 0 or 3–DS) 8.

  • Page 26: Host Communications

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Host Communications Function 7 on the Select Operation menu accesses the Host Communications menu screen You can use this screen to control host communications settings for the HOST port. (Configuration must be saved and decoder restarted for changes in this section to take effect.) Also defines trigger characters, buffer size and when message will be sent to the host.
  • Page 27 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Display Status and Primary Counters The Display Status and Primary Counters function on the Select Operation menu allows you to monitor system status and counters maintained by the decoder.

  • Page 28: Host Commands

    HOST port of the decoder. Programmable Logic Controllers (PLC) The decoder connects to an Allen-Bradley PLC as follows (see Figure 5): 1. Flexible Interface Module (Catalog No. 2760-RB) which supports a: – Point-to-Point link using the RS-232, RS-422, or DH485 interface of the HOST port.

  • Page 29: Host Computers

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Small Logic Controller (SLC) Figure 4 shows how the decoder connects to an SLC 500 Controller over an RS-232 link using the SLC BASIC Module (Catalog No. 1746-BAS), or to a SLC 5/03 Controller using Allen–Bradley’s DH485 multidrop interface.
  • Page 30 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Figure 5 PLC Controller Configurations Point-to-Point Link using Flexible Interface Module Point-to-Point Link using PLC-5 family processor RS-232, RS-422, or DH485 (point-to-point) with serial ASCII port. Flexible Interface Module with . . . 1771-1/O 2760-SFC1 or -SFC2 1771-1/O...

  • Page 31: Mounting Dimensions

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Mounting Dimensions Figure 6 shows mounting dimensions in inches (and mm) for the NEMA Type 1 and NEMA Type 4 decoders. Figure 6 Mounting Dimensions ( Allow clearance of 6 inches above and below decoder for cables) 4.57 (116.08) ALLEN...

  • Page 32: Accessories For Decoder

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Accessories for Decoder This section lists accessories available for the Single and Dual-Head Bar Code Decoders. Visible Laser Diode Scanners and Cables Catalog No. Product Description 2755-LD8 High Performance Visible Laser Diode Bar 500 scan per second fixed mount scanners with 10 foot (3.05 meters) attached Code Scanner.
  • Page 33 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Cable Selector Guide SCANNER Group I Group II LD4 / LD8 LD4 / LD8 NEMA NEMA Group III Group IV L7 / L9 L7 / L9 TYPE 1 TYPE 4 DECODER DECODER Group V Group VI...

  • Page 34: Input/Output Modules

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Laser Diode Scanner Adapter (for use with NEMA Type 1 decoders only) Catalog No. Product Description 2755-NC16 Adapter Connects laser diode, hand-held scanners to NEMA Type 1 decoder. The adapter has two connec- tors.
  • Page 35 Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Input Modules (require voltage source for activation) Catalog Number 2755-IB5S 2755-IA5S 2755-IM5S Maximum Input Voltage 32 VDC 140V RMS/VDC 280V RMS/VDC Minimum Input Voltage 3.3 VDC 90V RMS/VDC 180V RMS/VDC Input Resistance 1 k ohm –...

  • Page 36: How To Order Decoder

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders How to Order Decoder The Single and Dual-Head Decoders are available in different configurations. To order a decoder, use the following Catalog Number breakdown. You can order the decoder with options or separately for customer installation. 2755 - D S 1 A - 1 - U - B 1 - R 1 Bulletin Number LCD Display...

  • Page 37: How To Order Options

    Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders How to Order Options Decoder options can also be ordered separately for customer installation. Options include the LCD Display, variations of the I/O Module Board, and replacement power cords. LCD Display The 2 line x 20 character LCD Display with backlighting is available for customer installation by ordering Catalog No.

  • Page 38: Specifications

    Catalog No. 2755-IB5S 3.3-32 VDC Catalog No. 2755-IA5S 90-140V RMS/DC Catalog No. 2755-IM5S 180-280V RMS/DC Mechanical Enclosure Catalog No. 2755-DS1A or -DD1A NEMA Type 1 Catalog No. 2755-DS4A or -DD4A NEMA Type 4 LED Indicators POWER ON Green CPU ACTIVE Green COMMUNICATIONS...
  • Page 39 Communications HOST Port Electrical Standards RS-232, RS-422, RS-485 Protocols ASCII (RS-232, RS-422, DH485) Allen-Bradley PCCC (DH485 only) Connector (NEMA Type 1) 25-pin (female) subminiature D Connector (NEMA Type 4) 19-pin (male) circular Cannon KPT series Baud Rate 300, 1200, 2400, 4800, 9600, 19200, 38400...
  • Page 40 PLC is a registered trademark of Allen-Bradley Company, Inc. Publication 2755-2.43 – September, 1993 Supersedes Publication 2755-2.43 – March, 1992 Copyright 1993 Allen-Bradley Company, Inc. Printed in USA...

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