A–B ALLEN-BRADLEY 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.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Decoder Features This section describes features of the Single and Dual-Head Bar Code Decoders including: • NEMA Type Enclosures • Scanner Port(s) • Integrated 100-240V AC (nominal) Power Supply • LED Indicators • LCD Display • AUX and HOST Communication Ports • Discrete Input/Output Modules NEMA Type Enclosures The Single and Dual-Head Decoders are available in a NEMA Type 1 or NEMA Type 4 enclosure.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Scanner Ports The Dual-Head Decoder has two scanner ports, labeled Scanner A and Scanner B. The Single-Head Decoder has only the Scanner A port.➀ Figures 1 and 2 show the location of the ports. The scanner ports support all of the Allen-Bradley medium and high speed bar code scanners (see Accessories section). The scanners do not require a separate power supply; they receive power directly from the decoder.
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. Figures 1 and 2 show the location of the LED indicators. Table 1 defines the color and function of each LED.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders AUX Port The AUX port communicates with a standard ASCII terminal using the RS-232 interface. This terminal is referred to as the AUX terminal. The AUX port can switch between two modes of operation. • Decoder Configuration The ASCII terminal is used to access built-in setup menus to configure and monitor decoder operations; format and configure host communications; and display bar code data, output counters and decoder status.
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. All positions accept an output module. Position 8 also excepts an input module.
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 • compare the decoded data to data stored in the Primary or Extended match table and use the results to operate up to eight discrete outputs.
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. In this mode, the on-line performance indicator shows the percentage of valid scans.
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. Configuration Screens The decoder has built-in menus and screens for configuration and monitoring operations.
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. The operations are grouped according to Configuration, Display, or System functions.
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 performance Supplements Enable or disable supplements for UPC/EAN symbologies.
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 S Read or No-Read. • Comparing scanned data to pre-configured data stored in the Match Code Table S Match Entry – Scanned data matches a specific table entry.
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. Using Extended Match Codes you can compare all incoming data against table entries that you create to meet your own unique needs.
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 The AUX terminal and LCD display can each display bar code data, output counter values and decoder performance indicators.
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. Currently enabled rules are marked with an asterisk ( * ), Rules are enabled by assigning a value to the Find String Containing field.
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.
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. A range of values can be represented within the brackets by separating the first and last characters in the range by a hyphen. Square brackets must be used in pairs.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Table 4 Replacement String Metacharacters Character Description and Use \n 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” format.
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 Source A Symbology Any Symbol Number All Rule #2 Value B Any All Find String Containing .* .
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 Source A|B Symbology Code 128 Symbol Number All Rule #2 Value A|B I 2 of 5 All Find String Containing .* .
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 A|B A|B A|B Symbology Any Any Any Any All All All ^Q( . * ) ^S( . * ) ^V( . . . . . )$ Qty = \1 \1 \1 0 0 0 Alignment Right Right Right Right Fill Character None None None None 2 3 4 Symbol Number All Find String ^P( . . . . . . .
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 This rule checks symbols as they are decoded for values between 62 and 99. All other symbols would be ignored by this rule.
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 ^( . . . . . . )(.
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.
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. Field Delimiter (0 or 1) 7. Field Delimiter (0 or 1) 6. Bar Code Data or No-Read Message (0 to 64 characters, including start, stop, and check characters. Up to 64 characters will be sent for each field read.
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.
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.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Host Commands The decoder also supports a set of host commands for configuring the decoder, monitoring operations, and triggering the scanner. Host commands are sent to the decoder from a PLC controller or computer and perform the same functions as the configuration software. The HOST port accepts commands using the RS-232, RS-422 or DH485 interface and supports a variety of communication protocols.
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.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Figure 5 PLC Controller Configurations Point-to-Point Link using Flexible Interface Module RS-232, RS-422, or DH485 (point-to-point) Flexible Interface Module with 2760-SFC1 or -SFC2 Protocol Cartridge ... .. Point-to-Point Link using PLC-5 family processor with serial ASCII port.
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 BRADLEY 10.25 (260.35) 9.50 (241.3) 8.00 (203.20 ) 10.50 (266.70) 12.00 (304.80) Mounting Holes You can mount the decoder horizontally or vertically.
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 2755-LD8① Catalog No. Product High Performance Visible Laser Diode Bar Code Scanner. Description 500 scan per second fixed mount scanners with 10 foot (3.05 meters) attached cable. NEMA Type 1 and Type 4 available. Read distances up to 50 inches (1.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Cable Selector Guide SCANNER Group I NEMA TYPE 1 DECODER Group III Group II LD4 / LD8 LD4 / LD8 L7 / L9 L7 / L9 L4 / L5 L4 / L5 Group V Group VII NEMA TYPE 4 DECODER Group IV Group VI G3 / G6 LD1 / LD2 Group Decoder / Scanner Combination Description I Optional extension cable (there is a 10 ft. (3.05 m) cable hard-wired to the scanner) 15 ft. (4.75 m) 2755-C15D1 N MA 1 to LD4 / LD8 NEMA 40 ft. (12.
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. 2755-NC16 Product Adapter Description Connects laser diode, hand-held scanners to NEMA Type 1 decoder. The adapter has two connectors. The 15-pin D connector plugs into the scanner port of the decoder and the 9-pin D Connector connects to the hand-held scanner. Package Detectors for Scanners Catalog No. Description 2755-NP3 Optional, for Catalog No.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Catalog Number Maximum Input Voltage Minimum Input Voltage Input Resistance Maximum Input Current Drop Out Current Allowable Off-State Input Current Allowable Off-State Input Voltage Input Modules (require voltage source for activation) 2755-IB5S 2755-IA5S① 2755-IM5S① 32 VDC 140V RMS/VDC 280V RMS/VDC 3.3 VDC 90V RMS/VDC 180V RMS/VDC 1 k ohm – – 32mA DC @32VDC 10mA RMS @140V RMS 8mA RMS @280V RMS 1.0 mA DC 2.5 mA RMS 1.5 mA RMS 1.
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.
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. 2755-NR1.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Specifications Electrical Input Line Voltage 85 (Min) to 264 (Max) VAC 100 to 240 VAC Nominal 47 - 63 Hz Input Line Frequency Power Catalog No. 2755-DS1A or -DS4A 55VA Catalog No. 2755-DD1A or -DD4A 80VA I/O Module Protection Fuse (Replacement Part No. 77104-899-01) Output Module Voltage/Current Catalog No. 2755-0B5S Catalog No. 2755-0A5S Catalog No. 2755-0M5S 3-60 VDC, 0.5A Max 12-140 VAC, 0.5A Max 24-280 VAC, 0.
Product Data Bulletin 2755 Single/Dual-Head Enhanced Bar Code Decoders Scanner Ports Scanner Ports A and B Connector (NEMA Type 1) Connector (NEMA Type 4) Communications HOST Port Electrical Standards Protocols 15-pin (female) subminiature D 19-pin (male) circular Cannon KPT series Connector (NEMA Type 1) Connector (NEMA Type 4) Baud Rate Parity Data Bits Stop Bits Flow Control RS-232, RS-422, RS-485 ASCII (RS-232, RS-422, DH485) Allen-Bradley PCCC (DH485 only) 25-pin (female) subminiature D 19-pin (mal
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.
