PSC LM520 Integration & Programming Manual

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R44-2016 (Rev. E)

LM520 Scanner

Integration & Programming Manual

R44-2016 i-1

Contents

The LM520 Bar Code Scanner

Overview .........................................................................................................................................................1

Unpacking the LM520................................................................................................................................ .... . 2

Scanner Care .................................................................................................................................................2

Mounting the LM520

General Considerations ..................................................................................................................................3

Mounting .........................................................................................................................................................3

Mounting the Scanner Stand-Alone............ ..... ..................................... ..... ..... ................................. ..... .... ..... . 4

Integrating the Scanner to Read at the Proper Distance ................................................................................4

Integrating the Scanner Behind a Window .....................................................................................................5

Electrical Interface ..........................................................................................................................................8

Interface Cable Schematic................................................................................................................. ..... . 9

LM520 Scanner Configuration

Configuration Management ..........................................................................................................................10

Programming Methods......................................................................... ..... ..... .............................................. 12

Programming through the Serial Interface .............................................................................................12

Programming with Bar Codes................................................................................................................ 13

Conventions ..................................................................................................................................................13

Setting Serial Communication Parameters................................................................................................... 14

Baud Rate ..............................................................................................................................................14

Data Format........................................................................................................................................... 15

Flow Control........................................................................................................................................... 16

Controlling Scanning Through Host Commands.......................................................................................... 17

Triggering Scanning Using Software Switch ..........................................................................................17

Triggering Scanning Using Hardware Switch ........................................................................................ 18

Continuous Scanning Mode ...................................................................................................................18

LaserSense Scanning Mode.................................................................................................................. 19

Canceling Software Triggered Scanning ...............................................................................................19

Setting Symbology Parameters.................................................................................................................... 20

Enabling All Symbologies ......................................................................................................................20

EAN ........................................................................................................................................................21

UPC .......................................................................................................................................................21

Code 128................................... ..... ..... ..... ..................................... ..... ..... ..... ......................................... 22

Code ISBT 128.................................... ..... .... ..... ...................................... ..... .... ..... ................................ 23

Code 93..................................... ..... ..... ..... ..................................... ..... ..... ..... ......................................... 25

Codabar .................................................................................................................................................25

Code 39 ......................................... ..... ..... ..................................... ..... ..... ..... ..........................................26

Interleaved 2 of 5................................................................................................................................... 27

Standard 2 of 5...................................................................................................................................... 28

Formatting Bar Code Data............................................................................................................................ 29

Preamble ................................................................................................................................................29

Postamble ..............................................................................................................................................29

Filters..................................................................................................................................................... 30

Field Descriptions ............................................................................................................................31

Pad Character ................ ...................................... .... ..... ..... ...................................... .... ...................33

Edit Function ...................................................................................................................................33

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Setting the Bar Code Format................................................................................................................. 34

Additional Commands........................... ..... ..... .... ...................................... ..... ..... .... ..................................... 35

Good Read Beeper Duration .................................................................................................................35

Laser Timeout ........................................................................................................................................35

Double Read Timeout............................................................................................................................ 36

Read Verification ...................................... .... ..... ...................................... ..... .... ..... .................................36

No Read Message................. .... ..... ...................................... ..... .... ..... ................................................... 37

No Read Output Signal ..........................................................................................................................37

No Read Output Signal Mode 1 ......................................................................................................37

No Read Output Signal Mode 2 ......................................................................................................37

Diagnostic Commands ...........................................................................................................................38

Good Read LED Duration ......................................................................................................................38

Appendix A:Technical Specifications ......................................................... ..................................................A-1

Appendix B: Mechanical Specifications .......................................................................................................B-1

Appendix C: Factory Default Configuration .................................................................................................C-1

Appendix D: LM520 Programming Labels ....................................................................................................D-1

Appendix E: ASCII Conversion Table ...........................................................................................................E-1

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List of Tables

Table 1. Electrical Interface Specifications ..........................................................................................8

Table 2. Configuration Commands .....................................................................................................10

Table 3. Baud Rate ..............................................................................................................................14

Table 4. Data Format ..........................................................................................................................15

Table 5. Flow Control .........................................................................................................................16

Table 6. Software Switch Control .......................................................................................................17

Table 7. Hardware Switch Control .....................................................................................................18

Table 8. Continuous Scanning Mode ..................................................................................................18

Table 9. LaserSense Mode ..................................................................................................................19

Table 10. Symbologies .......................................................................................................................20

Table 11. EAN ....................................................................................................................................21

Table 12. UPC .....................................................................................................................................21

Table 13. Code 128 .............................................................................................................................22

Table 14. ISBT Symbology ................................................................................................................23

Table 15. Concatenation Pairs ............................................................................................................24

Table 16. ISBT Commands ................................................................................................................24

Table 17. Code 93 ...............................................................................................................................25

Table 18. Codabar ...............................................................................................................................25

Table 19. Code 39 ...............................................................................................................................26

Table 20. Interleaved 2 of 5 ................................................................................................................27

Table 21. Standard 2 of 5 ....................................................................................................................28

Table 22. Preamble .............................................................................................................................29

Table 23. Postamble ............................................................................................................................29

Table 24. Filter Examples ...................................................................................................................30

Table 25. Symbology Identifiers ........................................................................................................32

Table 26. Pad Characters ....................................................................................................................33

Table 27. Edit Functions .....................................................................................................................33

Table 28. Bar Code Format .................................................................................................................34

Table 29. Beeper Duration ..................................................................................................................35

Table 30. Laser Timeouts ...................................................................................................................35

Table 31. Double Read Timeout .........................................................................................................36

Table 32. Read Verification ................................................................................................................36

Table 33. No Read Message ...............................................................................................................37

Table 34. No Read Output Mode ........................................................................................................38

Table 35. Diagnostic Commands ........................................................................................................38

Table 36. Good Read LED Duration ..................................................................................................38

Table A-1. Performance Specifications ...........................................................................................A-1

Table A-2. Power Requirements ...................................................................................................... A-2

Table A-3. Physical and Environmental Specifications .................................................................. A-2

Table A-4. Agency Approvals ......................................................................................................... A-2

Table C-1. Factory Default Configuration ........................................................................................C-1

Table D-1. Programming Labels .................................................................................................... D-1

Table E-1. ASCII Conversion Table .................................................................................................E-1

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Section 1

The LM520 Bar Code Scanner

Overview

The LM520 scanner is a compact, decoded, single-line scanner for fixed position or embedded applications, such as conveyor, library, document tracking, chemical analyzers, vending machines, point-of-sale (POS) terminals, and other attended or unattended scanning applications. The LM520 is a complete scanning system, ready to plug in and scan. The LM520 presents a fast, easy and low-cost way to incorporate scanning into any application where you need to read a bar code.

A typical system using the LM520 scanner consists of the scanner itself and a host system such as a PC, POS system, or package sorting system. The host system controls the scanner and receives the decoded bar code data produced by the scanner. The laser in the LM520 scanner emits coherent visible light. When a bar code passes through the scanner’s beam, light is reflected off the bar code. The scanner collects this reflected light, processes it into a digital signal and decodes it into data that can be used by the host system. In some cases the data may be processed further by the scanner before being transmitted to the host.

The LM520 has four different operational modes which can be used to scan a bar code. The four operational modes include:

• an external switch such as an output line from a Programmable Controller (also

known as a PLC) can be used to enable scanning

• software commands from the host system

• continuous scanning operations, and

• a unique PSC motion detection circuitry called LaserSense™. This circuitry allows

the LM520 to only scan when an object is passed in front of it.

The various modes are selected via host commands or special programming bar codes.

The LM520 Bar Code Scanner Section 1

2 LM520 Scanner Integration & Programming Manual

Unpacking the LM520

The LM520 bar code scan scanner is shipped in custom packaging. Carefully open the package, and remove the scanner from the packing material.

The LM520 standard configuration includes:

• LM520 scanner

• power supply

• mounting hardware (two bolt studs with nuts)

• interface cable - male DB9 (scanner side) [with optional beeper if ordered]

• diskette with this manual and other information

When you open the shipping cart on, visually inspect the pack age’s contents. If any parts ar e damaged or you need additional hardware, please contact your reseller or the PSC Customer Support Center at 1-800-547-2507.

Scanner Care

The LM520 bar code scanner contains sensitive components which require special handling. PSC Inc. may not warrant damage due to improper handling.

• Do not open the scanner’s case. Doing so will void the warranty.

• Avoid touching the front window. Fingerprints will degrade the scanner’s

performance.

• Only clean the scan window when visual inspection reveals dirt or residue. Remove lint or foreign material be present with filtered clean air. Remove fingerprints or other residue using clean, cotton-tipped applicators dipped in isopropyl alcohol, or with soft tissues dipped in high-quality lens or eyeglass cleaner. Do not reuse cotton-tipped applicators or tissues.

• Do not scrub the window.

• Never wipe the window with a dry tissue or applicator.

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Section 2

Mounting the LM520

The LM520 bar code scanner is designed to be mounted to a stand in a fixed position. This section describes the layout of the mounts for optimum scanner performance.

General Considerations

Although the LM520 bar code scanner has been designed to be impact-resistant, it is important to consider the effect of the environment on the scanner. In particular, the mounting scheme should minimize the possibility of foreign objects contacting the window’s surface. Such contact will damage the window over time and re duce the scann er’s performance. The mounting design should also take into consideration the clearance needed for the power supply and interface cables. These cables should be routed away from the operator’s working area in attended applications.

Mounting

System integration is made easy with the LM520’s unique mounting design. Six mounting grooves in the scanner’s sealed enclosure enable mounting on any one of four sides. When looking at the back of the scanner, these slots are located as shown in Figure 1.

Figure 1. Mounting

Appendix B, Mechanical Specifications shows mechanical drawings of the precise position of the mounting slots relative to the scanning laser beam.

6789

12345

Mounting Slots

1.00"

(2.54cm)

0.50"

(1.27cm)

0.50"

(1.27cm)

0.675"

(1.71cm)

0.675"

(1.71cm)

LM520 Scanner

Mounting Slots (6 total)

Mounting the LM520 Section 2

4 LM520 Scanner Integration & Programming Manual

Mounting the Scanner Stand-Alone

For most instances using an adjustable mount is recommended. The position of the scan line can be fine-tuned during actual installation and the scanner’s distance from the scanned object can be easily changed. The location of the operator should also be considered for attended applications. Care should be taken to position the scanner to minimize the possibility of the operator overturning the scanner, spilling liquid on the scanner, inadvertently unplugging the cables, and so on.

Integrating the Scanner to Read at the Proper Distance

When deciding how to mount the LM520, there are many criteria that must be considered. First, there are minimum and maximum distances that the bar code can be from the front of the scanner to properly read, depending on the size of the bar code. These distances, or depth of field, are specified in Appendix A, Technical Specifications.

Second, the scanner must be positioned so that the bar code to be read is not “square” or parallel to the front of the scanner. The scanner must have at least 3 degrees skew angle to operate properly. See Appendix B, Mechanical Specifications for such information as skew, pitch, and the scanner’s mechanical parameters.

Third, the scanner must be positioned so that the scan line will be long enough to cover the entire bar code. The scan line should exceed the width of the bar code since only about 80% of the scan line is usable (see Figure 2). Use the following formula to calculate the expected usable line length (l) at a given distance (d):

l = [(d+0.88in) x 2 x tan (q)] x 0.8 (if d is measured in inches) or l = [(d+2.34cm) x 2 x tan (q)] x 0.8 (if d is measured in centimeters)

where

l = usable line length d = distance from the front of scanner q = half of the scan angle, (23° ± 2.0°)

Section 2 Mounting the LM520

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Figure 2. Mounting the Scanner

Integrating the Scanner Behind a Window

When the LM520 scanner is integrated into a larger system, additional factors must be taken into account. The most important of these is an additional window placed between the LM520 and the bar code to be read. While an additional window provides protection for the LM520, it will also degrade the scanner’s performance due to the need for the laser light to traverse two additional optical surfaces passing through to the bar codes, and the reflected light returning. Following the instructions in this section will help optimize the amount of outgoing light that reaches the bar code and the amount of reflected light that is collected by the scanner.

The LM520 scanner emits a laser beam in the form of a scan line. The beam’s light exits the scanner’s window and reflects off the bar code symbol. The reflected light returns through the window, and is collected with a photodiode. As in any optical system, any type of window causes a reduction in the amount of light that exits or enters the scanner since some of the laser light is lost due to surface reflection.

LM520 scanner

l = 80% of scan line

.88"

2.34cm

Mounting the LM520 Section 2

6 LM520 Scanner Integration & Programming Manual

The design and placement of the window is critical for optimum system performance. The following issues must be considered.

• The window must not block outgoing laser light.

• The window must not block laser light reflected from the bar code.

Figure 2 shows the minimum size and position of the window along the horizontal and vertical axes, respectively. The minimum window size must increase as

the distance between the scanner and the window increases. This is necessary to accommodate the width of the scan line.

• Reflections of outgoing laser light caused by the window or other reflective surfaces should not reach the front window of the scanner.

Determine the window tilt based on your application. The tilt angle of the window (that is, its position relative to the optical axis or center-line) is important because a portion of the emitted light will always be specularly reflected from each of the two window surfaces. This reflected light must not reach the scanner’s window either directly or via multiple reflections from other parts of the system.

Figure 3. Tilt Angle

Nominal Beam Path

d = 1.250"

31.74mm

0.880"

22.34mm

Angle = 103.7˚

0.125"

3.18mm

0.820"

20.83mm

Reflected light

Window

Angle

= 90 + 0.5 [ arctan (

)]

= 103.7

0.65

1.25

Section 2 Mounting the LM520

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An example of acceptable system window inclination is shown in Figure 2. As can be seen, moving the system wind ow cl oser to the scanne r mak es it n eces sary to incr e ase the win dow angle with respect to vertical. Less inclination is necessary if the reflection is directed below, rather than above the scanner, since laser light is emitted near the bottom of the scanner’s window and collected near the top of the scanner’s window. If the light reflected from the window will be deflected above the scanner , the required window angle (fr om horizontal) is given by:

If the light will be deflected below the scanner , the r equired window angle (from horizontal) is given by:

The window material you select depends on the anticipated environment and your scanner’s intended use. Appropriate window materials include glass, sapphire, and plastic. Glass, and especially sapphire, have adequate surface hardness for most applications. However , if you use any type of plastic, it should have a protective hard-coat on the exposed surface. The hard-coat will protect the plastic surface from damage if the system window needs to be cleaned.

In addition to hard-coating, some window applications may require special treatment such as antistatic or antireflection coatings. In general, do not use antiglare coatings due to undesirable polarization and diffusion effects.

Angle

= 90 + 0.5 [ arctan (

)]

if d is measured in inches

0.65

Angle

= 90 + 0.5 [ arctan (

)]

if d is measured in cm

1.65

Angle

= 90 - 0.5 [ arctan (

)]

if d is measured in inches

0.2

Angle

= 90 - 0.5 [ arctan (

)]

if d is measured in cm

0.51

Mounting the LM520 Section 2

8 LM520 Scanner Integration & Programming Manual

Electrical Interface

The LM520 scanner communicates with the host over a standard DB-9 connector. The pinouts for the connector are shown in Table 1.

Table 1. Electrical Interface Specifications

Pin #

Direction

(relative to LM520)

Signal Function

1 Output

Beeper/ Good Read

Beeper Drive/Good Read source current must be limited to 50mA with a maximum voltage of 5VDC.

5VDC output signal used to drive an audio indicator.

2 Output TX

Serial asynchronous RS232C le vel data transm itted to the host . NRZ f ormat and user programmable f or wo rd fo rmat and baud rate. (Default: 9600 baud, 8 data bits, no parity, 1 stop bit).

3 Input RX

Serial asynchronous RS232C level data r eceived f r om th e ho st. NRZ format and user programmable f or wo rd fo rmat and baud rate. (Default: 9600 baud, 8 data bits, no parity, 1 stop bit).

4 Output

No Read

No Read output will source 15mA @ 5VDC. The maximum sink current must be limited to 200mA with a maximum voltage of 14VDC.

This signal is asserted at the end of a scanning cycle if no label is decoded and will remain asserted until:

1. A successful decode occurs, or

2. A user specified timeout period elapses. This may be configured in 100ms increments from 100 ms to 9900 ms (9.9 seconds). Refer to the section titled No Read Output. NOTE: If the timeout is used, the signal will be immediately deasserted if a software scan command, hardware scan trigger on pin 9 or a LaserSense scan occurs before the user specified tim e elapses. Setting a timeout is not available in Continuous Scan mode.

5 Input Gnd Power supply/signal ground. 6 Input Vcc Power supply input voltage (4.75 - 12.0VDC) 7 Input CTS RS232C Clear to send control line. 8 Output RTS RS232C Request to send control line.

9 Input

Scan Trigger

Scan trigger signal must be limited to a maximum input voltage of 5VDC with a maximum input current of 10mA.

Ground on this input initiates bar code scanning. Scanning will continue until either: (a) this line returns to high (5VDC) level, or (b) this line is disconnected, or (c) the programmed time period expires, or (d) a bar code is decoded.

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Interface Cable Schematic

The drawing in Figure 4 shows a schematic view of the electrical connection between the scanner and the host.

Figure 4. Interface Cable Schematic

ORANGE YELLOW VIOLET GREEN RED WHITE BROWN BLUE

1 2 3 4 5 6 7 8 9

3 2

4 5

DB25-S

DB9-P

HOST END

SCANNER END

Connector is a 2.5 mm stereo plug for the scan trigger, no read signal and power supply ground.

Power Supply

4.75 - 12VDC

Beeper (if applicable)

BEEPER/GOOD READ TXD RXD NO READ GND VCC IN CTS RTS TRIGGER_IN

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Section 3

LM520 Scanner Configuration

The LM520 offers a command interface which allows a wide range of customization. Commands can be combined with standard programming bar codes to develop an active configuration and a saved or factory default configuration.

Configuration Management

The LM520 scanner always contains two configuration sets: the Active configuration and the Factory Default configuration. Both configurations are stored in nonvolatile memory. When the scanner receives a command changing the configuration, it changes the Active configuration. If the scanner is reset to the Factory Default configuration, the factory defaults are copied to the Active configuration. See Appendix C, Factory Default Configura- tion for a concise list of the factory defaults.

The LM520 offers the ability to change and save a new Factory Default configuration. To overwrite the Factory Default configuration as shipped from PSC, first make changes to the Active Configuration, then store the Active Configuration as the Factory Default. The previous Factory Default will be overwritten. Figure 5 illustrates this process. Table 2 describes the commands for changing the default configuration.

Table 2. Configuration Commands

Command Setting

Reset active configuration to factory defaults.

The active configuration will be overwritten.

Store the active configuration as Factory Default.

The contents of the Factory Default will be overwritten.

Section 3 LM520 Scanner Configuration

R44-2016 11

Figure 5. Configuration Management

Factory Default

Configuration

Host Serial Command

Programming Label

Active

Configuration

Z1 - Copy vaulted configuration into active configuration. Z2 - Copy configuration from active configuration to the factory default configuration.

LM520 Scanner Configuration Section 3

12 LM520 Scanner Integration & Programming Manual

Programming Methods

The LM520 scanner may be programmed either by sending commands from a host over the serial interface or by the using bar codes containing programmable commands. Typically, the scanner is programmed over the serial interface when it is integrated into a system.

Appendix D, LM520 Programming Labels, contains a minimal set of programming bar codes and the section titled, Programming with Bar Codes, on page13, describes how to create programming bar codes.

Programming through the Serial Interface

The easiest and most common way to program the LM520 is by sending ASCII commands through the serial interface. Each command transmission must begin with the STX (0x02 hex) and ESC (0x1B hex) characters. Next, the command itself is transmitted, followed by any necessary parameters. The command transmission ends with an ETX (0x03 hex). A complete serial command transmission, therefore, consists of:

STX-ESC-[command]-[parameters]-ETX

The scanner uses an ACK/NAK protocol to communicate with the host. The scanner does not echo received data back to the host, and will not acknowledge transmissions which do not begin with STX-ESC and end with ETX. Upon receipt of a valid command sequence, the scanner responds in one of two ways:

• All commands that are valid (both commands and parameters) take the requested action and then transmit an ACK to the host.

• If the command is invalid, the scanner responds with an ASCII NAK (0x15 hex).

All valid commands return an ACK. Otherwise, a NAK is returned if the command is not valid. If the command is not formatted properly (missing the STX, ESC, or ETX), the scanner does not respond. Each command recognized by the scanner consists of two ASCII characters, followed by any required parameters.

Section 3 LM520 Scanner Configuration

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Programming with Bar Codes

The LM520 scanner can also be programmed by scanning bar codes which contain commands. This method allows users to easily adjust scanner parameters.

Bar codes used for programming must be Code 128, with a Function Code 3 (FNC3) as the first character. The command following the FNC3 character configures the scanner in exactly the same way as if it had received the command over the serial line, except that the scanner will not acknowledge the command on the serial line. Each bar code may contain only one command. All parameters for the command must be included in the label with the command characters. For example, the label to limit the minimum number of Code 39 to 5 characters would be.

<FNC3>OH05

The scanner can be programmed not to accept programming bar codes by using the Disable Programming Bar Codes command (@Y). If you disable the programming with bar codes

feature, the scanner will still accept programming commands through the serial port. The Enable Programming (@Z) bar code commands will always be accepted by the scanner, and cannot be disabled.

If Disable Programming Bar Codes (@Y) is set, all programming bar codes except Enable Programming Bar Codes (@Z) will be treated as standard Code 128 bar codes.

Conventions

The remainder of this manual presents the valid commands in a tabular format. These tables contain two or three columns.

• First column

– Bar Code Command, contains the two-letter ASCII string which

the scanner accepts as programming commands through the serial port or in a programming label. See Appendix D, LM520 Programming Labels, for instructions on how to create bar code programming labels.

• Second co lumn

– Bar Code Parameters, may be present. If an entry appears in this

column, a parameter setting is required to complete the command.

• Last column

– Setting, describes the effect of the command and its associated

parameters.

• Default Entries – The factory default settings for the scanner are shaded and

denoted by asterisk.

A concise list of these defaults is presented in Appendix C, Factory Default Configuration.

³OH05

LM520 Scanner Configuration Section 3

14 LM520 Scanner Integration & Programming Manual

Setting Serial Communication Parameters

The first step in the integration process is establishing communications between the scanner and the host. This is done by matching the scanner’s communications parameters to the serial communication requirements of the host. The Baud Rate, Data Format and Flow Control communication settings of the scanner must match the serial communications requirements of the host. For example, if the scanner is sending data at the wr ong baud rate, the host will not be able to interpret the data that is being sent. The following section outlines the RS-232 communication settings.

Baud Rate

Use one of the commands shown in Table 3 to set the LM520 baud rate. Note that the scanner and the host must communicate at the same rate for communication to be successful. An ACK command will be sent by the scanner at the new baud rate, indicating that the command has been received and understood.

* Asterisk and shading denotes the Factory Default Setting.

Table 3. Baud Rate

Command Setting

DA Baud = 300 DB Baud = 600 DC Baud = 1200 DD Baud = 2400 DE Baud = 4800 DF * Baud = 9600 DG Baud = 19200 DH Baud = 38400

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R44-2016 15

Data Format

These parameters control the data format in which the LM520 will communicate with the host. Note that the scanner and host must

communicate in the same format for communication to be successful. An ACK command will be sent by the scanner in the new format indicating that the command has been received and understood. Table 4 lists the commands for the data format options.

Table 4. Data Format

Command Setting

EC 7 data bits, 1 stop bit, even parity ED 7 data bits, 1 stop bit, odd parity EK 8 data bits, 1 stop bit, even parity EL 8 data bits, 1 stop bit, odd parity EM * 8 data bits, 1 stop bit, no parity EN 8 data bits, 2 stop bits, no parity

LM520 Scanner Configuration Section 3

16 LM520 Scanner Integration & Programming Manual

Flow Control

As shown in T able 5, the LM520 scanner supports standard flow contr ol protocols, including XOn/XOff (software flow control) and CTS/RTS (hardware flow control). If CTS/RTS is being used, first send the HA command before sending a new Flow Control command (HB - HN). If the CTS and RTS lines are not used for flow control, they can be used to monitor and control the scanner. The default setting is no flow control: CTS = none; RTS = low when scanning in process and Xon/Xoff disabled. To return to this configuration send the HA command followed by the HN command.

Table 5. Flow Control

Command Setting

HA *

No Flow Control Xon/Xoff disabled CTS mode = none RTS mode = RTS low when ready to receive

Xon/Xoff Enabled CTS mode = none

CTS mode = Low to transmit Xon/Xoff disabled

CTS mode = High to transmit Xon/Xoff disabled

CTS mode = Low to begin scanning Xon/Xoff state unchanged

CTS mode = High to begin scanning

Xon/Xoff state unchanged HG RTS = Always Low HH RTS = Always High HI RTS = Low when scanner is ready to receive commands HJ RTS = High when scanner is ready to receive commands HK RTS = High when scanner has data to send HL RTS = Low when scanner has data to send HM RTS = High when scanning is in progress HN * RTS = Low when scanning is in progress

NOTE

If Xon/Xoff is enabled, then RTS = low when scanning and CTS = none If Xon/Xoff is disabled, then RTS = low when ready to scan and CTS = none Low = Mark signal (negative voltage) High = Space signal (positive voltage)

Section 3 LM520 Scanner Configuration

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Controlling Scanning Through Host Commands

Triggering Scanning Using Software Switch

A host can instruct the scanner to begin scanning by sending the Scan Now command. Table 6 shows that the number of scanning passes is user programmable.

Except for terminating after the requested number of scans if no bar code is read, scanning initiated through this command performs identically to scanning initiated by pressing the trigger (assertion on the Scan Trigger line, pin 9).

Table 6. Software Switch Control

Command Parameter Setting

ZD XX

(01-99)

Scan Now. Begin scanning immediately. Scan until a bar code is decoded, or for a maximum of XX scans. NOTE: The LM520 scans approximately 42 times per second.

ZD 00

Scan Now. Begin scanning immediately. Scan until a bar code is decoded, or until the scanning timeout expires. See BH command in Table 30.

NOTE

The ZD command returns ACK immediately followed by the bar code data when a bar code is decoded.

LM520 Scanner Configuration Section 3

18 LM520 Scanner Integration & Programming Manual

Triggering Scanning Using Hardware Switc h

Using a hardware switch can also be configured to respond to the CTS line rather than the Scan Trigger line using the commands below.

Scanning initiated in response to a CTS signal performs identically to scanning initiated by pressing the trigger (assertion on the Scan Trigger line, pin 9). To disable scanning in response to a CTS signal, set the CTS mode to a non-scanning mode (HA, HB, HC or HD) as described in Setting Serial Communication Parameters on page 14.

Hardware scanning continues until either the Scan T rigger is deasserted or until the scanner timeout expires. See BH command in Table 30.

Continuous Scannin g Mode

The LM520 may also be set for Continuous Scanning mode through host commands.

Table 7. Hardware Switch Control

Command Setting

CTS mode = High signal triggers scanning (Other serial options unchanged)

CTS mode = Low signal triggers scanning (Other serial options unchanged)

Table 8. Continuous Scanning Mode

Command Parameter Setting

NC Continuous scanning on.

ND*

Continuous scanning off – only for use when programming with bar codes. (Also, see Canceling Software Triggered Scanning.)

Section 3 LM520 Scanner Configuration

R44-2016 19

LaserSense Scanning Mode

LaserSense is a significant technology breakthrough. LaserSense technology has two key advantages over other automatic triggering methods.

• It detects movement at a user configurable range from the scanner. This eliminates false triggers from movement in the general area and clearly identifies where the bar code should be placed with a stable marker point.

• It is integral to the scanner. There are no additional components to fail or add-on components that are not well integrated.

Using a background color that contrasts with the object being detected will enhance performance.

Default: NG60

Range = 45 - 70

NG45 = 4.5” (minimum)

NG60 = 10” (default)

NG70 = 23” (maximum)

Canceling Software Triggered Scanning

A scan triggered by software, such as software trigger (ZD), LaserSense scanning (NA), or continuous scanning (NC) can be canceled using the ASCII DC4 command from the host, or by scanning the ND or NB labels. The ASCII DC4 command is a single byte (0x14 hex) and should not be sent with a STX-ESC preceding it. When the LM520 receives this single character, it will respond with an ACK, turn active scanning off and be ready to receive additional programming commands. Sending this DC4 command is sufficient and does not require the host to send th e Continuous Scanning O f f (ND) or Disable Lase rS ense (NB) co mmands.

Table 9. LaserSense Mode

Command Parameter Setting

NA *

Enable LaserSense. When an object is detected, scanning occurs until the scanning timeout expires. See the BH command in Table 30.

Disable LaserSense – only for use when programming with bar codes.(Also see Canceling Software Triggered Scanning.)

XX (45 - 70)

Set range for LaserSense. Higher values increases the effective range. A value that is too large will result in false triggers and continuous scanning. A value too low will result in no triggering. Tolerance = ±20%

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20 LM520 Scanner Integration & Programming Manual

Setting Symbology Parameters

The LM520 is able to decode UPC-A, UPC-E, EAN-8, EAN-13, Code 39, Code 128, Code 93, Codabar, Interleaved 2 of 5, and Standard 2 of 5 symbologies. The decoder will actively attempt to match bar code data against all symbologies which are enabled. Thus, performance is enhanced by disabling symbologies which are not used in a particular environment. The possibility of misreads due to symbology overlap will also decrease by disabling unused symbologies.

Enabling All Symbologies

It is possible to enable all symbologies at once. This command is typically used for diagnostic or demonstration purposes. For best performance in actual use, only those symbologies which are needed should be enabled.

Table 10. Symbologies

Command Setting

QM Enable all symbologies.

NOTE

This command does not enable either ISBT 128 or UPC/EAN supplementals.

Section 3 LM520 Scanner Configuration

R44-2016 21

EAN

UPC

Table 11. EAN

Command Parameter Setting

RA Disable EAN-13 RB Enable 2 and 5 digit supplementals for EAN-13 and EAN-8. RC * Enable EAN-13 RN Disable EAN-8 RP * Enable EAN-8

Disable all EAN 2 and 5 digit supplementals (EAN-8, EAN-13).

xx (01-99)

Enable number of scans to try to build EAN/UPC 2 and 5 digit supplementals. Maximum number of scans is 99, the

default is 15

The higher the number of tries to build the supplemental portion of the code, the longer it takes EAN/UPC labels without supplemental code to decode.

Table 12. UPC

Command Parameter Setting

Disable UPC-A (If EAN-13 = enabled, UPC-A labels will decode as EAN-13).

Enable 2 and 5 digit supplementals for UPC-A and

UPC-E QC * Enable UPC-A QH * Disable expansion of UPC-E to UPC-A QI Enable expansion of UPC-E to UPC-A QL * Enable UPC-E QV Disable UPC-E QX Disable all UPC 2 and 5 digit supplementals (UPC-A UPC-E)

xx (01-99)

Enable number of scans to try to build EAN/UPC 2 and 5

digit supplementals. Maximum number of scans is 99, the

default is 15

The higher the number of tries to build the supplemental portion of the code, the longer it takes EAN/UPC labels without supplemental code to decode.

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22 LM520 Scanner Integration & Programming Manual

Code 128

Reads variable length bar codes 1 to 50 characters.

Table 13. Code 128

Command Setting

TA Disable Code 128 TC * Enable Code 128 TD Enable function code transmission TE * Disable function code transmission TF Enable UCC 128 Emulation

NOTE

Code 128 function codes are transmitted as follows: FNC1 = 80h, FNC2 = 81h, FNC3 = 82, FNC4 = 83h FNC3 = in the first data position of a Code 128 bar code is reserved for programming labels and no data will be transmitted to the host from a programming label.

Section 3 LM520 Scanner Configuration

R44-2016 23

Code ISBT 128

ISBT 128 is a bar code symbology for labeling of whole blood and blood components adopted by the International Council for Commonality in Blood Banking Automation. (ICCBBA). Implementation of ISBT 128 requires the payment of a registration fee and an annual license fee thereafter. Contact the ICCBBA in Durham, NC USA. Their web address is: (http://www.ICCBBA.inter.net

)

The ISBT 128 standard allows two bar codes to be read as if they were a single bar code, known as concatenation. The physical placement of labels that can be concatenated is done so that a laser beam can pass completely through both labels. The information for both bar codes is transmitted to a host computer at the same time. There are 19 different code types in the ISBT symbology.

Table 14. ISBT Symbology

ISBT 128 Single label codes

Donation Collection Date Donation Collection Date and Time Manufacturer’s Identity and Container Information Manufacture’s Lot Number Nationally-specified Special Testing National use Staff Member Identification Number Date of Production Date and Time of Production Donor Identification Number Special Concatenation Programming Label

ISBT 128 Concatenation label codes

Of these, 8 types may be concatenated together in seven legal ways (see the Concatention Pairs table on following page).

Blood Groups

Data ids are ‘=‘ and ‘%’, label length is 6 data characters including data ids.

Nationally-specified Confidential Unit Exclusion Status.

Data ids are ‘&’ and ‘!’, variable length, nationally defined

Donation Identification Number

Data ids are ‘=‘ and x (where x is A-Z or 0-9), label length is 16 data characters including data ids.

Nationally-specified Donor Identification Number Data ids are ‘&’ and ‘;’, variable length, nationally defined

Expiration Date

Data ids are ‘=‘ and ‘>‘, label length is 8 data characters including data ids.

Expiration Date and Time

Data ids are ‘&‘ and ‘>‘, label length is 12 data characters including data ids.

Product Code

Data ids are ‘=‘ and ‘<‘, label length is 10 data characters including data ids.

Nationally-specified Product Code

Data ids are ‘&’ and ‘<’, label length is, label length is 10 data characters including data ids).

LM520 Scanner Configuration Section 3

24 LM520 Scanner Integration & Programming Manual

The other 11 types that are not normally concatenated may be specially programmed to be concatenated. See the specification for ISBT 128 from ICCBBA for creating specially programmed concatenated bar codes.

Table 15. Concatenation Pairs

Normal Concatenation Pairs

Donation Identification Number & Blood Groups Donation Identification Number & Nationally-specified Donor Identification Number Donation Identification Number & Nationally-specified Confidential Unit

Exclusion Status Product Code & Expiration Date Nationally-specified Product Code & Expiration Date Product Code & Expiration Date and Time Nationally-specified Product Code & Expiration Date and Time

Table 16. ISBT Commands

Command Setting

Enables single label mode ISBT 128, disables concatenated label mode ISBT 128. The single label mode will read all 19 ISBT 128 labels as single labels only (no concatenation is done).

T o read single label ISBT 128, bo th Code 128 must be enabled (TC) and single ISBT 128 mu st b e enab led (TQ). Standard Code 128 will not read while single ISBT 128 is enabled. To disable ISBT 128, use TA command.

Enables concatenated mode ISBT 128, disables single ISBT 128. The concatenation mode will only read the 8 types of ISBT 128 labels that are used in concatenation. See Table 14 for the 8 types of concatenation labels and Table 15 for their legal combinations with other concatenation types. The other 11 types of ISBT labels that are not normally used in concatenation will still read as single labels. However, with the use of a special programming label, the ot her 11 types of ISBT128 labels that ar e not norm ally concatenated may be concatenated. If they are specially programmed, they will not read as single labels. Only one special concatenation of these other 11 type labels can be programmed at a time.

T o read concat enated ISBT 128, both Code 128 m ust be enabled (TC) an d concatenat ed ISBT 128 m ust be enabled (TR). Standard Code 128 will not read while concatenated ISBT 128 is enabled. To disable ISBT 128, use TA command.

Disables the specially programmed concatenated ISBT 128 labels, if defined. To again read specially programmed concatenated ISBT 128 labels, use TR command followed by the special programming label. See the specification for ISBT 128 from ICCBBA for creating specially programmed concatenated bar codes.

Section 3 LM520 Scanner Configuration

R44-2016 25

Code 93

When Code 93 is enabled, the bar code length defaults are set to zero which allows the scanner to read Code 93 bar codes of varying lengths up to 50 characters. If the scanner will be used for specific fixed length bar codes, use the UE and UF commands to enable these fixed lengths.

Codabar

When Codabar is enabled, the bar code length defaults is set to zero which allows the scanner to read Codabar bar codes of varying lengths up to 50 characters. If the scanner will be used for specific fixed length bar codes, use the VE and VF commands to enable these fixed lengths.

Table 17. Code 93

Command Parameter Setting

UA * Disable Code 93 UB Enabled Code 93

XX (00 - 50)

Set minimum length for Code 93 to XX. If 00 is selected, the scanner ignores the min. and max settings.

XX (00 -50)

Set maximum length for Code 93 to XX.

Table 18. Codabar

Command Parameter Setting

VA * Disable Codabar VB Enable Codabar VC * Disable transmission of start/stop characters VD Enable transmission of start/stop as upper-case characters

XX (00 - 50)

Set minimum length for Codabar to XX characters. Includes start/stop and check characters, if transmitted. If 00 is selected, the scanner ignores the min. and max settings.

XX (00 - 50)

Set maximum length for Codabar to XX characters. Includes start/stop and check characters, if transmitted.

VG Enable transmission of start/stop as lower-case characters

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26 LM520 Scanner Integration & Programming Manual

Code 39

When Code 39 is enabled, the bar code length defaults is set to zero which allows the scanner to read Code 39 bar codes of varying lengths up to 46 characters. If the scanner will be used for specific fixed length bar codes, use the OH and OI commands to enable these fixed lengths.

Table 19. Code 39

Command Parameters Setting

OA Disable Code 39 OB * Enable standard Code 39 OC Enable full ASCII Code 39 OD * Disable Modulo 43 check character OE Enable Modulo 43 check character OF * Disable transmission of the start/stop characters OG Enable transmission of the start/stop characters

XX (00 - 46)

Set minimum data characters to XX characters. Includes start/stop characters and check characters, if transmitted. If set to 00, the scanner ignores the min/max settings.

XX (00 -46)

Set maximum data characters to XX characters. Includes start/stop characters and check characters, if

transmitted. OJ Enable transmission of the check character OK * Disable transmission of the check character

Section 3 LM520 Scanner Configuration

R44-2016 27

Interleaved 2 of 5

When Interleaved 2 of 5 is enabled, the default bar code length is fixed at 14 characters (PD14 & PE14).

Table 20. Interleaved 2 of 5

Command Parameters Setting

PA * Disable Interleaved 2 of 5. PB Enable Interleaved 2 of 5 without a check digit. PC Enable Interleaved 2 of 5 with a check digit.

XX (04 - 50)

Set minimum number of data characters for Interleaved 2 of 5 to XX characters. Add check digit, if transmitted.

XX (04 - 50)

Set maximum number of data characters for Interleaved 2 of 5 to XX characters. Add check digit, if transmitted.

PO *

Disable transmission of Interleaved 2 of 5 check digit.

Enable transmission of Interleaved 2 of 5 check digit.

NOTE

The total number of characters must be even. If the Check Digit is included, the number of data characters must be odd.

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28 LM520 Scanner Integration & Programming Manual

Standard 2 of 5

When Standard 2 of 5 is enabled, the default bar code length is fixed at 14 characters (PT14 & PU14).

Table 21. Standard 2 of 5

Command Parameter Setting

PQ * Disable Standard 2 of 5. PR Enable Standard 2 of 5 without a check digit. PS Enable Standard 2 of 5 with a check digit.

XX (04 - 48)

Set minimum length for Standard 2 of 5 to XX characters.

XX (04 - 48)

Set maximum length for Standard 2 of 5 to XX characters.

PV * Disable transmission of Standard 2 of 5 check digit. PW Enable transmission of Standard 2 of 5 check digit.

Section 3 LM520 Scanner Configuration

R44-2016 29

Formatting Bar Code Data

Bar code data can be returned to the host as raw bar code data or additional characters may be appended before or after the bar code data, or the bar code data may be truncated and reformatted to meet the needs of the host. Formatting can be set to occur regardless of the symbology of the bar code scanned or it can be specific to the symbology by applying different filters to different types of bar codes. Formatting will occur on the bar code data if it is a single bar code, if it is a bar code with additional supplementals added (UPC/EAN), or if it is two codes concatenated together (ISBT=128). The data returned to the host can take the form of a Preamble, Filtered Data, and Postamble. Both the Preamble and the Postamble apply to all bar codes regardless of symbology, and one or both can be omitted if not required by the host.

Preamble

A preamble may be added to the beginning of bar code data transmissions to provide a sta ndard start-of-transmission character. It may also be set for up to twenty ASCII characters. Note that the characters set as the preamble will be added to every bar code transmission for all symbologies.

Postamble

A Postamble may be added to the end of bar code data transmissions. This is commonly used to provide a standard end-of-transmission character, but may be set to up to twenty ASCII characters. Note that the characters set as the Postamble will be added to every bar code transmission for all symbologies.

Table 22. Preamble

Command Parameter Setting

KA * No preamble

(Up to 20 characters)

Add the characters specified to the beginning of every data transmission.

Table 23. Postamble

Command Parameter Setting

LA No postamble

LB *

(Up to 20 characters)

Add the characters specified to the end of every data transmission. The default is CR, LF (0x0D hex, 0x0A hex)

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30 LM520 Scanner Integration & Programming Manual

Filters

After the bar code is decoded, the LM520 scanner may apply a filter on the decoded data before transmitting the data to the host. A filter is maintained for each symbology the scanner supports. All bar codes using a given symbology are processed using the filter for that symbology. Table 24 shows examples of filters that include fill characters, edit functions and two types of “literals,” pre-literals and post-literals.

In the following examples the bar code data contain five numeric characters: “12345.”

Table 24. Filter Examples

Filter Output Comment

%DZL7% ‘12345000’

Return left-most seven character s. Zeroes are added to to the right of the label data to bring the total number of characters to seven.

%DSR7% ‘ 12345’

Return right-most seven character s. Spaces are added to the left of the label data to bring the total number of

characters to seven. %DL3% ‘123’ Return left-most three characters of the label. %DR4% ‘2345’ Return right-most four characters of the label.

%DM2,3% ‘234’

Return three characters of the label, starting at the

second character.

%DZLM2,3,7% ‘2340000’

1. Inner-most edit functions (M2,3): return three char-

acters of the label, starting at the second character.

Provide this data (‘234’) as in put to the ne xt inner -most

edit function.

2. Outer-most edit functions (L7): return the left-most

seven characters of the input string (‘234’). Zeroes are

added to the right of the label data to bring the total

number of characters to seven.

%DSRM2,3,7% ‘ 234’

1. Inner-most edit functions (M2,3): return three char-

acters of the label, starting at the second character.

Provide this data (‘234’) as in put to the ne xt inner -most

edit function.

2. Outer-most edit functions (R7): return the rig ht-most

seven characters of the input string (‘234’). Spaces are

added to the left of the label data to bring the total

number of characters to seven.

SCAN%D%END ‘SCAN12345END’

Return the pre-literal ‘SCAN’, the label data, and the

post-literal ‘END’.

Section 3 LM520 Scanner Configuration

R44-2016 31

Figure 6 shows an example of fully appended bar code data that would be sent from the scanner to the host. To set a filter for a particular symbology, use the command below. Note that the filter must be provided as a parameter. If no filter is provided, the scanner will return no data. To return only the bar code data a filter of %D% may be set. Reference Table 25 for Symbology Identifiers.

Figure 6. Formatting Example

Field Descriptions

[Pre-literal] and [Post-literal] - Optional fields that specify literal characters before and after the bar code data. These are different from a Preamble or Postamble in that they only apply to the symbology that the filter is defined. When a filter is applied to all symbologies, preand post-literals serve the same function as a Preamble and Postamble. For example, if the following was defined: Preamble = “123”, Postamble = “789”, Pre-literal = “ABC”, and Postliteral = “XYZ” the data returned to the host would take the format of “123ABC[bar code data]789XYZ”.

NOTE

Filters must be bracketed by the ‘%’ character as shown in this example: %[id]D[Pad Character][Edit Function]%

PREAMBLE | PRE-LITERAL | BARCODE DATA | POST-LITERAL | POST-AMBLE

[PRE-LITERAL]%[SYMBOLOGY ID][D][PAD CHARACTERS][EDIT FUNCTIONS]%[POST-LITERAL]

0 - 20

CHARACTERS

0 - 20

CHARACTERS

Symbology specific

filter data

[PRE-LITERAL] and [POST-LITERAL] - optional fields that specify literal characters before and after the bar code data. [SYMBOLOGY ID] - optional field that identifies the type of bar code symbology the scanner read. When provided, the filter contains an entry from, Symbology Identifiers Table. [D] - optional field. If present, contains bar code data. [PAD CHARACTERS] - optional field used to add padding characters when justifying the bar code data. [EDIT FUNCTIONS] - optional field used to include part of the bar code data as part of the output data.

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32 LM520 Scanner Integration & Programming Manual

The [D] parameter is an optional field containing the ASCII character D (0x44 hex). If the D is present, bar code data (including supplemental and concatenated bar code data) will be returned in it’s place (edited or unedited – see Edit Functions below.) If a ‘D’ is not present in the filter, no bar code data will be sent, but any pre- or post-literal data will be sent for that symbology.

The [symbology id] parameter is optional. When provided, the filter will output a single character indicating the symbology of the bar code. When a symbology identifier is used, it precedes the bar code data and informs the host of the data type that follows. For example: If the filter for Code 39 is set to ‘%idD%’, a Code 39 bar code containing the data ‘12345’ will be transmitted to the host as ‘a12345’. The following table lists the symbology identifiers.

The [pad character] field is optional. It designates a character to be used as padding when justifying the code data.

The [edit functions] parameter is an optional field that can divide the bar code data into pieces by taking the right-most characters, left-most characters, or middle characters.

Table 25. Symbology Id ent if iers Symbology Identifier

UPC-A ‘d’ UPC-E ‘d’ EAN-13 ‘d’ EAN-8 ‘d’ Code 39 ‘a’ ITF ‘b’ STF ‘c’ Codabar ‘h’ Code 93 ‘g’ Code 128 ‘f’ Code ISBT128 ‘f’

Section 3 LM520 Scanner Configuration

R44-2016 33

Pad Character

Valid pad characters are N, S and Z as shown below.

Edit Function

Edit functions may be one of:

If n is larger than the number of characters in the bar code, then pad characters ar e added to the output. The bar code data will be justified in the same position in which it appeared in the bar code.

Edit functions may also be nested. When nested, the innermost function is processed first, taking the bar code data as input. The ou tput of the in nerm ost functio n is passed to th e next most-embedded function as input. However, only the outermost function will pad data using the pad character(s).

Examples of edit strings, including nesting and the use of pad characters, are shown in Table 26.

Table 26. Pad Characters

N Do not fill S Pad with spaces Z Pad with zeroes

Table 27. Edit Functions

R[s,](n)

Include the last ‘n’ characters of the output from filter ‘s’ or the label if ‘s’ is not present.

L[s,](n)

Include the first ‘n’ characters of the output from filter ‘s’, or the label if ‘s’ is not present.

M[s,](p,n)

Include ‘n’ characters starting at position ‘p’ of the output from filter ‘s’ or the label if ‘s’ is not present.

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34 LM520 Scanner Integration & Programming Manual

Setting the Bar Code Format

To set the bar code format for a particular symbology, use the following commands. Note that the filter must be provided as a parameter. If no filter is provided, the scanner will return no data. To return only the bar code data (including supplemental and concatenated bar code data), a filter of %D% may be set.

For example, a complete command to set the bar code filter to return the literal ‘12’, the bar code data, then the literal ‘34’ for UPC-A bar codes is:

FC12%D%34

The command to set the same filter for UPC-E bar codes is:

FD12%D%34

Table 28. Bar Code Format

Command Parameter Setting

FA *

Set filters for all symbologies to %D% (bar code data only)

Set filters for all symbologies that have not been specifically set with a filter to %idD%

(symbology identifier and bar code data) FC Filter Set filter for UPC-A bar codes FD Filter Set filter for UPC-E bar codes FE Filter Set filter for EAN-13 bar codes FF Filter Set filter for EAN-8 bar codes FG Filter Set filter for Code 39 bar codes FH Filter Set filter for Interleaved 2 of 5 bar codes FI Filter Set filter for Codabar bar codes FJ Filter Set filter for Code 93 bar codes FK Filter Set filter for Code 128 and ISBT 128 bar codes FM Filter Set filter for Standard 2 of 5 bar codes

Section 3 LM520 Scanner Configuration

R44-2016 35

Additional Commands

The commands in this section customize the scanner’s operation to meet your specific system requirements.

Good Read Beeper Duration

This command controls the length of time the scanner will produce a signal on the Beeper/Good Read line (pin 1) when a bar code is successfully decoded.

Laser Timeout

If a bar code is not read and decoded successfully within a certain period of time, the LM520 will stop scanning. The length of time the scanner remains active before timing out can be set to between 0.1 and 9.9 seconds. This command affects hardware, software and LaserSense triggering modes.

Table 29. Beeper Duration

Command Parameter Setting

XX (00 - 99)

Set Beeper duration to (XX * 45)ms. The default is 135ms (XX = 03).

NOTE

Setting AE = 00 disables the Good Read Beeper.

Table 30. Laser Timeouts

Command Parameter Setting

XX (00 - 99)

Set scanning timeout to (XX * 100)ms. +/-10%. (Default is 6 seconds XX = 60)

NOTE

A duration of zero implies infinite duration. The scanner continues to scan until:

a. a bar code is decoded b. cancel command, DC4 (0x14 hex) is sent if using software or LaserSense triggering c. hardware triggering is released or deasserted on the scan trigger line using hardware trig ger.

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36 LM520 Scanner Integration & Programming Manual

Double Read Timeout

After a bar code has been successfully read, the scanner will wait for the amount of time set using this command before it will read a bar code that contains the same bar code data. Setting this parameter effects the scanner’s internal timing and produces no external I/O response.

Read Verification

When the Read Verification feature is used, the LM520 will not consider a bar code to be successfully decoded until it has obtained the same results from scanning the bar code on multiple attempts. This feature is particularly useful for reading poorly printed bar codes. Since there is a small performance penalty when this feature is enabled, it should be left disabled unless it is needed to prevent misreads of poorly printed bar codes.

Table 31. Double Read Timeout

Command Parameter Setting

NH *

XX (00-99)

Default is NH24 (timeout = 600ms). Set double read prevention to XX * 25ms. After a successful decode, the scanner will ignore a label containing identical data for XX * 25ms. If set to 00, scanner returns to default timeout = 600 ms.

Table 32. Read Verification

Command Setting

BC * Read verification disabled BD Read verification set to two decodes BE Read verification set to four decodes

Section 3 LM520 Scanner Configuration

R44-2016 37

No Read Message

When no read message is enabled, the ASCII character string ‘No Read’ will be transmitted to the host when scanning is completed without a bar code being successfully decoded.

No Read Output Signal

The LM520 No Read signal is output on pin 4 of the 9 pin DSUB connector. This signal is an active low signal (0 V) input to a PLC (Programmable Logic Controller). The normal signal is high (5VDC). Care must be taken no to exceed the electrical limits of this output (see Electrical Interface). The signal is asserted (0V) when a scan results in no bar code being decoded. There are two modes of operation available.

No Read Output Signal Mode 1

When a scanning timeout occurs or the trigger is released and no bar code was decoded, the signal is set active (0V) and remains active until a label is successfully decoded.

No Read Output Signal Mode 2

When a scanning timeout occurs or the trigger is released and no bar code was decoded, the signal is set active (0V) and remains active until a duration set by the timeout argument of the enable command NKxx. After the timeout, the signal returns to 5V.

The two digit argument for NK has a valid range of 1-99 (0.1 – 9.9 sec.) In the event of another scanning timeout occurring during the active period of the signal, the timer is reset to 0, which extends the active period of the No Read Output Signal for the period xx.

Table 33. No Read Messa ge

Command Setting

NX No read message enabled. NY * No read message disabled.

NOTE

The No Read message is not available if Continuous Scanning mode is enabled.

NOTE

The No Read Output Signal is deactivated and remains at 5VDC when the command is given to disable this function.

This Function is not available in Continuous Scan mode.

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38 LM520 Scanner Integration & Programming Manual

Diagnosti c C ommands

The LM520 scanner provides commands which allow testing of the scanner, and provide information about the firmware in the scanner.

Good Read LED Duration

This command controls the length of time the scanner will light the Good Read LED when a bar code is successfully decoded.

Table 34. No Read Output Mode

Command Parameter Setting

Enable No Read Timeout Mode 1 and forces disable of No Read Timeout Mode 2 [if a laser timeout occurs, the No Read Timeout signal (pin 4) is asserted (0.0VDC) until a decode occurs].

NJ *

Disable No Read Timeout Mode 1. Returns signal to +5VDC.

NKxx XX = 01 - 99

Enables No Read Timeout Mode 2 and for ces disab le of No Read Timeout Mode 1. The XX arguments following the command characters are the length of time in approximately 100 ms that the No Read Timeout signal will remain 0.0VDC.

NL *

Disable No Read Timeout Mode 2. Returns signal to +5VDC

Table 35. Diagnostic Commands

Command Settings

Display operational software version. Scanner sends ACK followed by the data.

Activate the Beeper/Good Read line (pin 1) for a single Good Read beep (as configured by B eeper Duration: AE command).

Activate the internal Good Read LED for the amount of time specified by Good Read LED duration (AF command).

Table 36. Good Read LED Duration

Command Parameter Setting

XX (00-99)

Set Good Read LED duration to XX * 45ms. The default is 135ms (XX = 03).

R44-2016 A-1

Appendix A:Technical Specifications

Table A-1. Performance Specifications

Parameter Specification

Scan Rate 42 scans/second ± 10% (bi-directional) Scan Angle 46° nominal, ±2.0° Vertical Beam Pointing 0° nominal, ±2.0° (relative to mounting surface)

Horizontal Beam Pointing

88.3° nominal, ±4° (toward right from engine perspective, relative to

engine front face) Vertical Beam Exit Position See Appendix B Horizontal Beam Exit Position See Appendix B

Usable Scan Line Length

l = [(d+0.88 inches) x 2 x tan q]0.8

l = [(d+2.34 cm) x 2 x tan q]0.8

where

l = usable line length

d = distance from the front of scanner

q = half of the scan angle, (23° +/- 2°)

Depth of Field

The minimum depth of field ov er which a print quality UPCA label (10 mil,

13 mil) or C39 label (all others) with given minimum element width can

be read.

Code Size Depth of Field

5 mils 2.5 – 4.25“

7.5 mils 2.0 – 7.25“

10 mils 1.5 – 10.25“

13 mils 1.5 – 14.25“

20 mils* * -- 20.0“

55 mils* * -- 36.0“ Start-Up Time 100ms from power on (mirror at rest) to >90% of full deflection scanning.

Skew Tolerance

< ± 55° from normal. Measured 7” (127 mm) from the front of the module

on 20 mil paper code.

Pitch Angle

< ± 65° from normal. Measured 7” (127 mm) from the front of the module

on 20 mil paper code. Specular Dead Zone < ±3° Wavelength 650nm visible laser diode standard

*The near point reading capability is limited by resolution of the module, and is also limited by the symbol length on lower density codes.

A-2 LM520 Scanner Integration & Programming Manual

Table A-2. Power Requirements

Supply Voltage Range

4.75 – 12.0V DC

Supply Current Triggered Continuous Scan LaserSense Host-Activated

Scanning Operating 130mA (typical) 165mA (end of laser life) Surge 200mA for 2ms during initial power-up Standby 60mA max N/A 90mA max 60mA max

Ripple Maximum allowable ripple & noise on the power source is 100mv, peak to peak

T a bl eA-3. Physical and Environmental Specifications

Parameter Specification

Dimensions Height 1.35 “ (3.43 cm)

Width 2.0 “ (5.08 cm) Length 2.52 “ (6.40)

Volume

6.80 cubic inches (111.43 cubic cms)

Weight

0.30 lbs. (136.1 grams)

Temperature Operating -20º C to +40º C (normal mode)

-20º C to +30º C (operating in continuous scanning mode at 12 VDC)

Storage -40º C to +70º C Relative Humidity 5% - 95% Ambient Light 2153 lux max. Radiated Emissions Susceptibility IEC 1000-3-3 Mechanical Shock 1500G (all axes) ESD 20 kV Rain and Dust IP54

T abl eA-4. Agency Approvals

Laser Output Power 1.26 mW ±6% Laser Safety CDRH Class II, IEC 825 Class 2 EMI/RFI FCC-A, EN55022-B, UCCI-B, AS/NZ 3450 Safety Conformity UL, TÜV, CUL, GOST-R

R44-2016 B-1

Appendix B: Mechanical Specifications

0.53"

(13.46cm)

90˚±1.5˚

0.820"

(20.83cm)

23.0˚ ±2.0˚

88.3˚±2.0˚

0.086"

(21.84cm)

0.088"

(22.34cm)

1.35" (3.43cm)

2.53" (6.34cm)

2.00" (5.08cm)

C-1 LM520 Scanner Integration & Programming Manual

Appendix C:

Factory Default Configuration

Table C-1. Factory Default Configuration

Cmd Description

@Z Enable Scanning of Programming Labels AE03 Beeper/Good Read duration = 135ms AF03 Good Read LED = 135ms BC DisableRead Ve r ifi catio n BH60 Laser time-out = six seconds DF Select 9600 baud EM Set serial data word to 8 bits, one stop bit and no parity FA Clear Label Formats to Default (%D%)

Disable all Flow Control Protocols. Xon/Xoff is off, CTS mode is None. RTS mode

is forced to RTS high ready to receive (default for CTS) HN RTS High Indicates Scanning in Progress (default for RTS) KA Disable Preamble LB Postamble = CR, LF (0x0D 0x0A) NA Enable LaserSense mode ND Disable Continuous Scanning mode NH24 Double Read timeout = 600ms NJ/NL Disable No Read timeout NY Disable No Read message. OB Enable standard Code 39 OD Disable Code 39 check character OF Disable transmit of the Code 39 start/stop characters OK Disable transmission of the Code 39 check character PA Disable Interleaved two of five PO Disable transmission of Interleaved 2 of 5 check digit PQ Disable Standard two of five (STF) PV Disable transmission of STF check digit

R44-2016 C-2

Cmd Description

QC Enable UPC-A QH Disable expansion of UPC-E QL Enable UPC-E QX Disable all UPC 2 and 5 digits supplementals (UPC-A, UPC-E) QY15 Number of scanning retries to build UPC/EAN supplementals = 15 RC Enable EAN-13 RP Enable EAN-8 RS Disable all EAN 2 and 5 digit supplementals (EAN 8, EAN13) TC Enable Code 128 TE Disable transmission of Code 128 function codes UA Disable Code 93 VA Disable Codabar VC Disable transmission of Codabar start/stop characters

D-1 LM520 Scanner Integration & Programming Manual

Appendix D:

LM520 Programming Labels

The most common method of configuring the LM520 scanner is by sending commands from the host. (see Configuration of the LM520). The bar codes contained in this table are a limited set of the programmable options.

Table D-1. Programming Labels

Feature Code Bar Code

Reset Factory Defaults Z1

Baud rate - 9600 DF

Data Format - 8 data bits, 1 stop bit, no parity

Enable no flow control HA

Enable software flow control

Enable hardware flow control

Enable all symbologies QM

Turn beeper off AE00

Enable label programming

Disable label programming

³ Z1

³ DF

³ EM

³ HA

³ HB

³ HL

³ QM

³ AE00

³ @Z

³ @Y

R44-2016 D-2

Programming Labels (continued)

Feature Code Bar Code

Set beeper duration to 135ms

AE03

Set scanner timeout to

6.0 seconds

BH60

Set scanner timeout to

9.9 seconds

BH99

Set scanner to no timeout until bar code is decoded

BH00

Scan now, until timeout ZD00

Continuous scan ON NC

Continuous scan OFF ND

LaserSense ON NA

LaserSense OFF NB

LaserSense Range (Default)

NG60

LaserSense Range Min. NG45

LaserSense Range Max. NG70

³ AE03

³ BH60

³ BH99

³ BH00

³ ZD00

³ NC

³ ND

³ NA

³ NB

³ NG60

³ NG45

³ NG70

E-1 LM520 Scanner Inte gration & Programming Manual

Appendix E: ASCII Conversion Table

Table E -1 . ASCII Conversion Table

CHAR DEC HEX CHAR DEC HEX CHAR DEC HEX

NULL 0 00 0 48 30 [ 91 5B SOH 1 01 1 49 31 \ 92 5C STX 2 02 2 50 32 ] 93 5D ETX 3 03 3 51 33 ^ 94 5E EOT 4 04 4 52 34 _ 95 5F ENQ 5 05 5 53 35 ` 96 60 ACK 6 06 6 54 36 a 97 61 BEL 7 07 7 55 37 b 98 62 BS 8 08 8 56 38 c 99 63 HT 9 09 9 57 39 d 100 64 LF 10 0A : 58 3A e 101 65 VT 11 0B ; 59 3B f 102 66 FF 12 0C < 60 3C g 103 67 CR 13 0D = 61 3D h 104 68 SO 14 0E > 62 3E i 105 69 SI 15 0F ? 63 3F j 106 6A DLE 16 10 @ 64 40 k 107 6B DC1 17 11 A 65 41 l 108 6C DC2 18 12 B 66 42 m 109 6D DC3 19 13 C 67 43 n 110 6E DC4 20 14 D 68 44 o 111 6F NAK 21 15 E 69 45 p 112 70 SYN 22 16 F 70 46 q 113 71 ETB 23 17 G 71 47 r 114 72 CAN 24 18 H 72 48 s 115 73 EM 25 19 I 73 49 t 116 74 SUB 26 1A J 74 4A u 117 75 ESC 27 1B K 75 4B v 118 76 FS 28 1C L 76 4C w 119 77 GS 29 1D M 77 4D x 120 78 RS 30 1E N 78 4E y 121 79 US 31 1F O 79 4F z 122 7A SP 32 20 P 80 50 { 123 7B ! 33 21 Q 81 51 | 124 7C “ 34 22 R 82 52 } 125 7D # 35 23 S 83 53 ~ 126 7E $ 36 24 T 84 54 DEL 127 7F % 3725U 8555 & 3826V 8656 * 3927W8757 ( 4028X 8858 ) 4129Y 8959 * 42 2A Z 90 5A +432B ‘ 44 2C

-452D .462E /472F

PSC LM520 Integration & Programming Manual

Specifications and Main Features

Frequently Asked Questions

User Manual