Rice Lake BCD Manual

76127

BCD

Interface for the 520 Indicator

Installation and Configuration

Manual

Contents

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

Specifications subject to change without notice.

January 2008

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.

2BCD Interface Installation and Configuration Manual

Introduction 1

About This Manual

This manual is intended for use by service technicians

responsible for installing the BCD option in 920i®

digital weight indicators.

This manual applies to indicators using Version 1.04

of the 920i software.

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.

7ARNING

Decimal Digit

BCD

8421

0 0000

1 0001

2 0010

3 0011

4 0100

5 0101

6 0110

7 0111

8 1000

9 1001

Table 1-1. Decimal to Binary Conversion

2BCD Interface Installation and Configuration Manual

2.0 Installation

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.

7ARNING

#AUTION

BCD Option

Board

Configuration

Dip Switch

7ARNING

Installation 3

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

nylon tie in the parts kit to secure the serial cable to the mounting pem (see Figure 2-2 below).

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 2-3. BCD Option Card

Plug in ribbon

connector to the

back of the 520

indicator.

Snaps onto the

520 CPU board.

(J2)

C24

R18

C10

C23

R17

R19

R10

R13

R12

R15

R14

C4 GND

GD1

C12

C20

C21

C14

3.3V

C16

C17

C19

C15

C11

C25

VR2

R11

C13

C18

R16

C22

VR1

C26

SW1

39 1

658

2003

ISP

Revision

147

P/N

Gnd

RICELAKE WEIGHING SYSTEMS

SW1

Conﬁguration Dip Switch

784512 63

OPEN

784512 63

OPEN

4BCD Interface Installation and Configuration Manual

2.2 Dip Switch Configuration

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).

Unit Status Bit/Communications Output Selection

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

Units/Tri-State Input

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

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

SW1-4 Mode

0Unit Status Bit mode – Indicates primary or secondary

1Communications Select mode – RS-232

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

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

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

7ARNING

Installation 5

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.

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.

SW1-1 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

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

6BCD Interface Installation and Configuration Manual

3.0 Data Information

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

Figure 3-1. BCD External Connection

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.

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

DataValid 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

AutoTare Switch Input

UnitSelect (or Tri-State Enable)

Switch Input

Serial Input

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)

Data Information 7

Pin Description

1Logic Common

2Logic Common

3Units (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.

See Section 2.2 on page 4 for dip switch configuration

4Hold Switch. Input freezes the BCD registers

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

accesses TX serial output

64th SD -4

74th SD -2

84th SD -1

9Polarity 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

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