Rice Lake BCD, 520 Installation And Configuration Manual

BCD

Interface for the 520 Indicator

Installation and Configuration

Manual

76127

Contents

Technical training seminars are available through Rice Lake Weighing Systems.

Course descriptions and dates can be viewed at www.ricelake.com or obtained

by calling 715-234-9171 and asking for the training department.

About This Manual ................................................................................................................................... 1

1.0 Introduction.................................................................................................................................. 1

2.0 Installation ................................................................................................................................... 2

2.1 BCD Option Card Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

2.2 Dip Switch Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3.0 Data Information .......................................................................................................................... 6

3.1 Operation of Remote Switch Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.2 Floating Decimal Point . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3 Polarity Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

4.0 Parts List .................................................................................................................................... 12

BCD Option Limited Warranty ................................................................................................................ 13

© 2008 Rice Lake Weighing Systems. All rights reserved. Printed in the United States of America.

Specifications subject to change without notice.

January 2008

2 BCD Interface Installation and Configuration Manual

About This Manual

7ARNING

This manual is intended for use by service technicians

®

responsible for installing the BCD option in
digital weight indicators.

This manual applies to indicators using Version 1.04
of the

920i software.

920i

Some procedures described in this manual
require work inside the indicator enclosure.
These procedures are to be performed by
qualified service personnel only.

1.0 Introduction

The BCD interface is used with 520 digital weight indicators to send weight and status information to remote
displays, printers and other peripheral devices. The data is updated after each display update and continuously
available for use.

The BCD interface option is CMOS, NMOS, and TTL compatible. BCD outputs are capable of sourcing/sinking
20mA.

The BCD option comes with a BCD interface option card and ribbon cable. An external port provides for
connection of a DB-37 interface cable (which exits the back of the 520) for communication to a peripheral
device. See the 520 Installation Manual (PN 68973) for proper connections on the 520 CPU board.

The BCD (binary-coded decimal) option uses a straight assignment of the binary equivalent. The weights of the
BCD code are 8, 4, 2, and 1. See

Table 1-1 for decimal to binary conversion.

Decimal Digit

8 4 2 1

BCD

0 0 0 0 0

1 0 0 0 1

2 0 0 1 0

3 0 0 1 1

4 0 1 0 0

5 0 1 0 1

6 0 1 1 0

7 0 1 1 1

8 1 0 0 0

9 1 0 0 1

Table 1-1. Decimal to Binary Conversion

Introduction 1

2.0 Installation

7ARNING

#AUTION

BCD Option
Board

Configuration
Dip Switch

7ARNING

Figure 2-1 shows the BCD option card as installed in the 520 indicator. The indicator enclosure must be open to
install the BCD card.

The 520 has no on/off switch. Before opening the unit, ensure the power cord is disconnected from the
power outlet.

Use a wrist strap to ground yourself and protect components from electrostatic discharge (ESD) when
working inside the indicator enclosure.

These units use double pole/neutral fusing which could create an electric shock hazard. Procedures
requiring work inside the indicators must be performed by qualified service personnel only.

2.1 BCD Option Card Installation

1. Disconnect the 520 indicator from power source.

2. Place the indicator on an antistatic work mat. Remove screws that hold the backplate or cover to the
enclosure body, then lift the backplate or cover away from the enclosure and set it aside.

3. Use the 8-32 nuts in hardware kit to secure DB-37 connector plate to backplate of indicator.

Figure 2-1. 520 Indicator with BCD Option Installed

4. Carefully align the large option card connector (J1) with connector J2 on the 520 CPU board. Press down
to seat the option card in the CPU board connector.

5. Use the 4-40 screws provided in the option kit to secure the other end of the option card to the threaded
standoffs on the 520 CPU board.

6. Plug 40-pin ribbon cable to J4 on BCD card.

Do not connect communications to J3 if switch SW1-4 is in Units mode.

2 BCD Interface Installation and Configuration Manual

7. Plug serial cable to J3 on BCD card. Plug other end of serial cable to J8 on 520 CPU board. Use the

Plug in ribbon
connector to the
back of the 520
indicator.

Snaps onto the

520 CPU board.

(J2)

C24

C2

5V

R18

R7

C10

C8

C9

C23

C5

R17

R19

R10

R9

R1

R3

R13

R12

R15

R14

C4

GND

GD1

C12

C20

C21

C14

C7

C6

R
4

R
5

3.3V

C16

C17

R8

U1

C1

C19

U3

U8

C15

C11

U5

R6

C25

R2

VR2

R11

C3

1

J3

U4

U7

C13

C18

R16

U2

C22

VR1

J2

U6

C26

J4

SW1

1

J1

L

D

1

Rx

Tx

40

39

1

34

33

D

1

0

32

1

658

2

2003

ISP

Revision

2

147

P/N

Gnd

RICE LAKE WEIGHING SYSTEMS

SW1

Configuration Dip Switch

784512 63

OPEN

784512 63

OPEN

nylon tie in the parts kit to secure the serial cable to the mounting pem (see

NOTE: When connecting serial cable to J8 of 520 CPU board, be sure that red wire goes to TX (transmit), black wire to
GND (ground), and green wire to RX (receive).

Figure 2-2. Serial Cable Tie

Figure 2-2 below).

Figure 2-3. BCD Option Card

Installation 3

2.2 Dip Switch Configuration

7ARNING

The BCD option card contains dip switches (see Figure 2-3 on page 3). Move the switches to configure BCD
interface parameters (see Table 2-1).

SW1-1 SW1-2 SW1-3 SW1-4 SW1-5 SW1-6 SW1-7 SW1-8

DEC_1 DEC_2 POL_SEL Units/Com Select Units Input Select Tri-State Select Reserved Reserved

Table 2-1. Dip Switch Configuration Modes

Unit Status Bit/Communications Output Selection

See Table 2-2 for unit status bit/communications output select configuration.

SW1-4 Mode

0 Unit Status Bit mode – Indicates primary or secondary

1 Communications Select mode – RS-232

Table 2-2. Units Status Bit/Communications Select Mode Configuration

By connecting J3 on the BCD board to J8 on the 520 board, communications mode allows the throughput of
connector J3 to be used as a wiring path for communications from the 520 indicator to an external device through
the DB-37 connector. It is not a communications port, rather an alternative route for wiring a 520 communication
port to an external device.

Do not connect communications to J3 if switch SW1-4 is in Units mode.

BCD Option Card 520 Indicator

J3-1 TX J8-1 TX

J3-2 Gnd J8-2 Gnd

J3-3 RX J8-3 RX

Table 2-3. J3/J8 Connections

Units/Tri-State Input

See Table 2-4 below, for information on configuring units or tri-state input modes.

SW1-5 SW1-6 Mode

0 0 Not valid

0 1 Units enable

1 0 Tri-State enable

1 1 Off

Table 2-4. Units/Tri-State Input Configuration

4 BCD Interface Installation and Configuration Manual

Decimal Rotation Configuration

See Table 2-5 below for information on configuring dip switch for decimal rotation. See Section 3.2 on page 11
for more information on decimal rotation.

SW1-1 SW1-2 Parallel Output Format

0 0 No rotation

0 1 Rotate left enable

1 0 Rotate right enable (primary only)

1 1 Reserved

Table 2-5. Decimal Rotation Configuration

Polarity Bit Select

See Table 2-6 below, for information on configuring polarity bit select mode. See Section 3.3 on page 11 for
more information on polarity switch.

SW1-3 State

1 + Polarity (logic 1 = +5V) ; – Polarity (logic 0 = common)

0 + Polarity (logic 0 = common); – Polarity (logic 1 = +5V)

Table 2-6. Polarity Bit Select Configuration

Installation 5

3.0 Data Information

10

12
14
16
18

8
7
6
20

24
23
22
21

32
27
26
25

31
30
29
28

9
11
13
15
17
19
5
35

34
37
4
33
3

36

1

2

DB-37

Logic 0 = See Section 3.3 on page 10
Logic 1 = Center of Zero
Logic 1 = Valid Print
Logic 0 = Data Registers Changing
Logic 0 = Overload/Underload
Logic 0 = Scale in Motion
Logic 1 = Secondary or TX Serial Output: if dip switch configuration
Logic 1 = Net Mode is properly selected

See Figure 3-2

RX Serial Input: if dip switch configuration is properly selected.
No connect otherwise

Leading “1”

“1”
“2”
“4”
“8”

“1”
“2”
“4”
“8”

“1”
“2”
“4”
“8”

“1”
“2”
“4”
“8”

“1”
“2”
“4”
“8”

Polarity Bit

Zero Bit
Print Enable Bit

Data Valid Bit
Overload Bit
Motion Bit
Units Bit/TX Serial Output

Gross/Net Bit

Gross/Net Switch Input
Zero Switch Switch Input

Hold Switch Switch Input
Auto Tare Switch Input
Unit Select (or Tri-State Enable)
Switch Input

Serial Input

Logic Common

Logic Common

Digital Common
(Not Chassis or Earth Ground)
See note below

MSD

(Most Significant Digit)

4th SD

3rd SD

2nd SD

LSD

(Least Significant Digit)

The following sections provide information on BCD pin-outs, data information, and remote switches.

NOTE: The 520 parallel BCD option does not have a floating ground. For proper operation, it is necessary to connect Logic
Common of the BCD peripheral device to Logic Common pins 1 and 2 of the BCD option.

6 BCD Interface Installation and Configuration Manual

Figure 3-1. BCD External Connection

Pin Description

1 Logic Common

2 Logic Common

3 Units (primary/secondary) Switch or Tri-State Enable Input. Serves as remote input switch for the Units or Tri-State

function. Change of state toggles units between primary or secondary; or Logic 1 places output in Tri-State mode.

Section 2.2 on page 4 for dip switch configuration

See

4 Hold Switch. Input freezes the BCD registers

5 Units Bit. Specifies the status of the units; Logic 1 = secondary units, or if enabled by dip switch configuration,

accesses TX serial output

6 4th SD -4

7 4th SD -2

8 4th SD -1

9 Polarity Bit. Specifies the status of the polarity. See Section 3.3 on page 11

10 Leading One. Logic 1 if the sixth significant digit is odd; Logic 0 if it is even. See Figure 3-1 on page 6

11 Zero Bit. Specifies the status of zero. Logic 1 = center of zero

12 MSD 1

13 Print Enable Bit. Specifies data valid, no motion, no overload/underload and positive gross weight. Hold switch

must be at logic 1 (OFF). Logic 1 = print enabled

14 MSD 2

15 Data Valid Bit. Informs the external device that the BCD output registers have been updated and the data is “true.”

Data is not valid if the display shows other than numeric data, if the display is held (in regulatory modes), or if data
integrity has been lost. This bit will toggle momentarily to Logic 0 each time the registers are updated. Logic 0 =
data not valid

16 MSD 4

17 Overload Bit. Specifies the status of positive or negative scale overload. Logic 0 = overload/underload

18 MSD 8

19 Motion Bit. Specifies the status of motion on the scale. Logic 0 = scale in motion

20 4th SD 8

21 3rd SD 8

22 3rd SD 4

23 3rd SD 2

24 3rd SD 1

25 2nd SD 8

26 2nd SD 4

27 2nd SD 2

28 LSD 8

29 LSD 4

30 LSD 2

Data Information 7

Pin Description

31 LSD 1

32 2nd SD 1

33 Auto Tare Switch Input. A remote switch for the auto tare function

34 Gross/Net Switch Input. A remote switch for the gross/net function. Signals the indicator to switch between gross

and net modes

35 Gross/Net Bit. Specifies the status of the mode of the scale. Logic 1 = Net mode

36 RX serial output, if enabled by dip switch configuration for communication mode

37 Zero Switch Input. A remote switch for the zero function

8 BCD Interface Installation and Configuration Manual

3.1 Operation of Remote Switch Inputs

37

34

33

4

3

1

2

DB-37

Zero Switch

Gross/Net

Auto Tare

Hold

Units Select (primary/secondary)

or Tri-State Enable

Logic Common

Logic Common

OFF

ON

OFF

AUTO TARE

GROSS/NET

ZERO

ON

HOLD
(If on, this freezes the BCD registers)

UNITS SELECT (toggles between primary
and secondary) or TRI-STATE Output Enable
(if Tri-State configuration switch is enabled,
On position enables Tri-State mode).

Figure 3-2. BCD Remote Switches

Three of the front panel switches (zero switch, gross/net switch, and auto tare switch), can be operated from a
remote location using momentary-action pushbuttons. Note that each “push” of a remote switch activates the
associated function once. The function of the gross/net switch is to change the state of output between gross and
net mode.

An alternate action switch is suggested to operate the Hold and Units Select/Tri-State Enable. When using the
BCD option in Units mode, the switch state is independent of the front panel and toggles between primary and
secondary units if any change of state is detected.

Tri-State output enable is used to allow other peripheral devices to use the same BCD output. To place the unit in
Tri-State mode, set dip switches according to

Table 2-4 on page 4.

All switch inputs are tied to 5V through pull-up resistors on the BCD option card to ensure reliable operation.

NOTE: Connect the pins/switches to Logic Common only, not case ground or other grounds.

Data Information 9

Good engineering practices suggest:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37

1
20
2
21
3
22
4
23
5
24
6
25
7
26
8
27
9
28
10
29
11
30
12
31
13
32
14
33
15
34
16
35
17
36
18
37
19

DGND (Logic Common)
4SD MSB (8)
DGND (Logic Common)
3SD MSB (8)
Units/Tri-State enable
3SD (4)
Hold bit
3SD (2)
Units bit/TX serial output
3SD LSD (1)
4SD (4)
2SD MSB (8)
4SD (2)
2SD (4)
4SD (1)
2SD (2)
Polarity
LSD MSB (8)
LSD (1)
LSD (4)
Zero bit
LSD (2)
MSD LSB (1)
LSD LSB (1)
Print enable
2SD LSB (1)
MSD (2)
Auto tare
Valid data
Gross switch
MSD (4)
Net
Overload
No connect/RX serial
MSD MSB (8)
Zero switch
Motion bit

19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20

520 ribbon cable
header on BCD
option

DB-37 connector
connects to the
backplate of the 520
indicator

• Switches should be placed no more than six feet (two meters) from the indicator.

• Cables for low level digital signals should not be placed near high voltage sources or equipment that
emits high levels of EMI/RFI.

Figure 3-3. BCD Header to DB-37 Connector Pin-outs Option

10 BCD Interface Installation and Configuration Manual

3.2 Floating Decimal Point

A BCD receiving device must assume the decimal point in a single location for either units (no decimal point is
actually sent on the BCD lines). The BCD offers several configurations for aligning the decimal point. Refer to
Table 2-5 on page 5 for dip switch settings.

With switch SW1-1 closed (logic 0), the decimal point is rotated left. The BCD option automatically adjusts for
the floating decimal point to accommodate units-switching on fixed decimal point devices. It adjusts the decimal
point of the units with fewer decimal digits, to match that of the units with the most decimal digits.

Example:

2721 lb — transmits as 27210 — is interpreted as 2721.0 lb

1234.5 kg— transmits as 12345 — is interpreted as 1234.5 kg

The receiving device interprets the decimal point at one place.

Switch SW1-2, when closed (logic 0), shifts the weight data of the primary units to the right one place (if it is
configured with a fixed zero), dropping the least significant digit. This function is primarily used to condense the
weight data to five and one-half digits by eliminating the fixed zero from the parallel output.

Example:

Displayed Weight

5th SD 4th SD 3rd SD 2nd SD LSD SD Fixed Zero on Receiving Device

252350 lb 2 5 2 3 5 0

Table 3-1. Floating Decimal Point Example

NOTE: With both switches closed, no rotation is performed.

Parallel Output

3.3 Polarity Switch

The BCD option returns polarity on pin 9. The polarity logic may be reversed by setting switch SW1-3. See
Table 2-6 on page 5 below for information on polarity switch configuration.

Data Information 11

4.0 Parts List

See Table 4-1 below for a list of parts for the BCD option for the 520 indicator.

Part Number Part

75148 BCD plate

76155 Cable, 40 pin assembly

55947 37-pin mating connector

15497 Cable, 25-conductor 24AWG

Table 4-1. BCD Option Parts List

12 BCD Interface Installation and Configuration Manual

BCD Option Limited Warranty

Rice Lake Weighing Systems (RLWS) warrants that all RLWS equipment and systems properly installed by a
Distributor or Original Equipment Manufacturer (OEM) will operate per written specifications as confirmed by
the Distributor/OEM and accepted by RLWS. All systems and components are warranted against defects in
materials and workmanship for two years.

RLWS warrants that the equipment sold hereunder will conform to the current written specifications authorized
by RLWS. RLWS warrants the equipment against faulty workmanship and defective materials. If any equipment
fails to conform to these warranties, RLWS will, at its option, repair or replace such goods returned within the
warranty period subject to the following conditions:

• Upon discovery by Buyer of such nonconformity, RLWS will be given prompt written notice with a
detailed explanation of the alleged deficiencies.

• Individual electronic components returned to RLWS for warranty purposes must be packaged to
prevent electrostatic discharge (ESD) damage in shipment. Packaging requirements are listed in a
publication, Protecting Your Components From Static Damage in Shipment, available from RLWS
Equipment Return Department.

• Examination of such equipment by RLWS confirms that the nonconformity actually exists, and was
not caused by accident, misuse, neglect, alteration, improper installation, improper repair or
improper testing; RLWS shall be the sole judge of all alleged non-conformities.

• Such equipment has not been modified, altered, or changed by any person other than RLWS or its
duly authorized repair agents.

• RLWS will have a reasonable time to repair or replace the defective equipment. Buyer is responsible
for shipping charges both ways.

• In no event will RLWS be responsible for travel time or on-location repairs, including assembly or
disassembly of equipment, nor will RLWS be liable for the cost of any repairs made by others.

THESE WARRANTIES EXCLUDE ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING WITHOUT

LIMITATION WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. NEITHER

RLWS

NOR DISTRIBUTOR WILL, IN ANY EVENT, BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.

RLWS AND BUYER AGREE THAT RLWS’S SOLE AND EXCLUSIVE LIABILITY HEREUNDER IS LIMITED TO

REPAIR OR REPLACEMENT OF SUCH GOODS. IN ACCEPTING THIS WARRANTY, THE BUYER WAIVES ANY AND
ALL OTHER CLAIMS TO WARRANTY.

SHOULD THE SELLER BE OTHER THAN RLWS, THE BUYER AGREES TO LOOK ONLY TO THE SELLER FOR

WARRANTY CLAIMS.

NO TERMS, CONDITIONS, UNDERSTANDING, OR AGREEMENTS PURPORTING TO MODIFY THE TERMS OF THIS

WARRANTY SHALL HAVE ANY LEGAL EFFECT UNLESS MADE IN WRITING AND SIGNED BY A CORPORATE
OFFICER OF RLWS AND THE BUYER.

© 2008 Rice Lake Weighing Systems, Inc. Rice Lake, WI USA. All Rights Reserved.

RICE LAKE WEIGHING SYSTEMS • 230 WEST COLEMAN STREET • RICE LAKE, WISCONSIN 54868 • USA

Parts List 13