White knight Pem050 User manual

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187 E. 670 S., Kamas, UT 84036

435.783.6040 888.796.2476

https://wkfluidhandling.com

PEM050 Owner’s Manual

Manual available online at wkfluidhandling.com

Manual Part Number: 18200-LM-0052

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Copyright © 2017 White Knight Fluid Handling | A Graco company Version 2.0.5 | 13 June 2017 | Pg. 2 
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Table of Contents 
Table of Contents .......................................................................................................................................................2
1Introduction..........................................................................................................................................................4
2Specifications & Performance.............................................................................................................................5
2.1 Pump Specifications ...................................................................................................................................5
2.2 Exploded View and Bill of Materials ...........................................................................................................6
2.3 Dimensions.................................................................................................................................................7
3Pump Warranty....................................................................................................................................................8
4Installation and Precautions................................................................................................................................9
4.1 Precautions.................................................................................................................................................9
4.2 System and Pump Environment Recommendations/Requirements ....................................................... 10 
4.3 Installation Advantages............................................................................................................................ 10 
4.4 Installation Instructions............................................................................................................................ 11 
4.5 Connections............................................................................................................................................. 12 
5Hold Up Volume ............................................................................................................................................... 13 
5.1 Motor on Bottom Orientation: .................................................................................................................. 13 
5.2 Motor on Top Orientation:........................................................................................................................ 14 
6Electrical........................................................................................................................................................... 14 
6.1 Wire Connectors/Wire Leads................................................................................................................... 14 
6.1.1 Connector I: Power Connection Table................................................................................................. 14 
6.1.2 Connector II: Communication Connection........................................................................................... 15 
6.1.3 RS422/RS485...................................................................................................................................... 15 
6.1.4 Ethernet over TCIP.............................................................................................................................. 16 
7Software Interface ............................................................................................................................................ 18 
8Standard Communication Protocol................................................................................................................... 18 
8.1 Communication Syntax & Communication Modes: ................................................................................. 18 
8.1.1 Communication Modes:....................................................................................................................... 19 
8.1.2 Saving Communication Settings:......................................................................................................... 22 
8.1.3 Software Reset: ................................................................................................................................... 22 
8.1.4 Configure Digital Signals: .................................................................................................................... 22 
8.2 Setting Up RS485 Communication.......................................................................................................... 23 
8.3 Operating the PEM050............................................................................................................................ 24 
8.3.1 Pumping Actions:................................................................................................................................. 24 
8.3.2 Steps to Volume Conversion:.............................................................................................................. 24 
8.3.3 High Repeatability vs. Long Diaphragm Life: ...................................................................................... 24 
8.4 Actions:.................................................................................................................................................... 25 
8.4.1 Dispense Action:.................................................................................................................................. 25 
8.4.2 Refill Action:......................................................................................................................................... 27 
8.4.3 Zero Pump Action:............................................................................................................................... 29 
8.4.4 Clear Errors:......................................................................................................................................... 29 

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4.5 Quit Current action:.............................................................................................................................. 29 
4.6 Stop Pump:.......................................................................................................................................... 29 
4.7 Save Configurations: ........................................................................................................................... 30 
4.8 Open Valve:......................................................................................................................................... 30 
4.9 Empty Pump: ....................................................................................................................................... 30 
4.10 Suck Back Only: .............................................................................................................................. 30 
5 Motor Current Settings:............................................................................................................................ 30 
5.1 Motor Currents..................................................................................................................................... 31 
5.2 Setting the Motor Currents Using the Terminal................................................................................... 31 
5.3 Setting the motor currents using the updated interface....................................................................... 31 
5.4 Optimize Motor Current Setting........................................................................................................... 31 
5.5 Constant Operation.............................................................................................................................. 32 
6 Advanced Configurations:........................................................................................................................ 33 
7 Checking PEM050 Status:....................................................................................................................... 34 
7.1 Process Flags:..................................................................................................................................... 34 
7.2 Input Errors:......................................................................................................................................... 35 
7.3 Using Status Codes:............................................................................................................................ 37 
7.4 Troubleshooting Indicators: ................................................................................................................. 38 
8 Operation Examples:............................................................................................................................... 39 
9 ASCII Table Reference............................................................................................................................ 40 
10 Error Value Reference............................................................................................................................. 42 
9Direct Motor Control Commands...................................................................................................................... 43 
1 Motor Commands:................................................................................................................................... 43 
1.1 Valve Operation:.................................................................................................................................. 43 
1.2 Valve Sensors:..................................................................................................................................... 43 
1.3 Motor Movement:................................................................................................................................. 43 
1.4 Motor Stall Detect: ............................................................................................................................... 44 
1.5 Position:............................................................................................................................................... 44 
1.6 Errors:.................................................................................................................................................. 44 
1.7 Motor Speed / Acceleration: ................................................................................................................ 45 
2 Erase Pump Program.............................................................................................................................. 45 
3 Creating a Custom Program.................................................................................................................... 45 
Pump Service & Rebuilds................................................................................................................................. 46 
1 Ordering Instructions ............................................................................................................................... 46 
2 Rebuild Information.................................................................................................................................. 47 
3 RMA Request Form................................................................................................................................. 48 
4 Decontamination Instructions & Certificate of Decontamination ............................................................. 49 
 

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1 Introduction

Thank You for Purchasing White Knight Products

You have purchased a White Knight product that has been designed to our exacting

specifications and built by a team of technicians with the highest commitment to quality!

White Knight is the world leader in zero-metal, ultra high-purity pumps and continues to drive

the industry with new technology and products. Since the inception of White Knight in 1995,

we have been awarded over 14 US patents for our designs and have multiple other patents

pending! White Knight currently produces over 30 sizes/models of pumps in varying materials

to meet our customers’ stringent requirements in numerous applications including ultra-high

temperature re-circulation; slurry and high pressure chemical delivery systems.

White Knight has been the recipient of multiple prestigious industry awards for its designs and

continues to lead the industry in quality because White Knight manufactures products from raw

material to finished goods in our own facility located in Kamas, UT. This allows us to

rigorously manage our quality assurance process to ensure that our strict cleanliness

procedures are always followed and that components are built using consistent methods and

conditions to make our products reliable and consistent.

Our strict process controls include assembling and testing our products in a class 100,

temperature and humidity-controlled cleanroom. White Knight products also pass functional

tests and are then dried with CDA and double bagged in the cleanroom to ensure cleanliness

and operational integrity.

Before installing your White Knight product, please carefully review the product manual. There

are many helpful hints and ways to optimize the set up and use of your White Knight product

as well as instructions and requirements for installation. In addition, there are many

accessories in this manual that will enhance the functionality of your White Knight product.

Our team has gone to great lengths to provide you with the highest quality products at the best

value and we back them up with excellent warranties and world class support! We hope you

agree our products will serve your exacting needs and meet your stringent requirements every

time you use a White Knight Product.

Sincerely,

Steve Smith

CEO

White Knight Fluid Handling

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2 Specifications & Performance

2.1 Pump Specifications

PEM050 Pump Specifications

Dispense

Range per

Stroke1

Max

Discharge

Pressure

Repeatability

(Full Scale)2

Max

Cycles

Per

Minute3

Air

Consumption

SCFM4

Fluid

Path

Materials

Fluid

Temperature

range

Suction

Lift5

50 ml Max

1 ml Min

80 PSI

+/- 0.1%

Up To

6

1-3 SCFM

PTFE

0-100°C

32-212°F

4.6

meters

15 feet

Supply Air

Pressure

Fluid Valves

Valve Manifold

Communication

Protocol

Pump Mechanism

60-80 PSI

Pneumatic Pilot

valves

2-6 Valves

ASCII commands over:

* RS422

* RS485 (Configurable)

* Ethernet

Stepper Motor

connected to a

rolling Diaphragm

piston.

Electrical Specifications

Absolute Minimum

Nominal

Absolute Maximum or Peak

Voltage Requirements

17 VDC

24 VDC

Current Draw

1 amp

1.3 amps

2 amps

1. Power supply should be regulated. Unregulated power supplies may damage electrical components.

2. Optimized parameters can improve repeatability (up to ± 0.01%). Contact White Knight for details.

Dispense measured at full stroke with maximum and minimum supply pressures at 80 psi and 60 psi.

3. White Knight only warrants the PEM050 to 500,000 cycles, test ran at full stroke

4. “Max” represents 80 PSI supply pressure; “Min” represents 60 PSI supply pressure

5. To maximize repeatability, it is best to minimize suction lift scenarios

Note: all tests ran with water at ambient temperature

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2.2 Exploded View and Bill of Materials

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2.3 Dimensions

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3 Pump Warranty

White Knight Fluid Handling follows strict procedures in all phases of manufacturing, assembly, and

testing to ensure reliability of its products. Each pump is individually tested to assure its functional

operation integrity.

White Knight Fluid Handling warrants the PEM050 metering pump, subassemblies and components to

be free from defects in materials and workmanship to one year from date of start-up, 18 months from

the date of shipment or upon completion of 500,000 cycles, whichever occurs first. Failures due to

misuse, abuse or any unauthorized disassembly of a White Knightpump will nullify this warranty.

The PEM050 metering pump is warranted for up to 80 PSI air supply pressures, and 80 PSI discharge

pressures. Wearable parts are not covered if used to pump abrasive slurries.

Due to the broad and ever-evolving applications for usage of White Knightpumps we cannot

guarantee the suitability of any pump component or subassembly for any particular or specific

application. White Knight Fluid Handling shall not be liable for any consequential damage or expense

arising from the use or misuse of its products in any application. Responsibility is limited solely to the

replacement or repair of defective White Knightpumps, components or subassemblies. All options

to rebuild or replace aforementioned items shall remain under the judgment of White Knight Fluid

Handling. Decisions as to the cause of failure shall be solely determined by White Knight Fluid

Handling.

Prior written, faxed or emailed approval must be obtained from White Knight Fluid Handling before

returning any pump component or subassembly for warranty consideration.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IN LIEU OF ALL OTHER WARRANTIES

EXPRESSED OR IMPLIED INCLUDING ANY WARRANTIES OF SUITABILITY FOR ANY

PARTICULAR PURPOSE. NO VARIATIONS OF THIS WARRANTY BY ANYONE OTHER THAN

THE PRESIDENT OF WHITE KNIGHT FLUID HANDLING IN A SELF-SIGNED AGREEMENT SHALL

BE HONORED OR CONSIDERED LEGALLY BINDING.

Steve Smith, CEO

White Knight Fluid Handling

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4 Installation and Precautions

4.1 Precautions

Handling

DO NOT LIFT PUMP BY LIQUID FITTINGS OR AIR TUBING!

Air Supply

The operation of the PEM050 requires a minimum of 60PSI air supply pressure, ran through a minimum ⅛” ID

airline. Supplying less than 60 PSI air supply pressure to the pump will not allow the positively controlled

inlet/outlet valves to fully actuate. Max air supply pressure is 80 psi.

Dry Priming/Air Purging

Initial priming of the PEM050 is critical to the pumps performance. For optimal air purging, the pump

should be mounted with the liquid ports up (motor bottom configuration). The pump should be fully

cycled until no air is found in the liquid dispense line.

Use of Electronically Controlled Metering Pumps

Electrically controlled metering pumps do not qualify for use in explosion proof environments.

Pumping Slurries and Abrasives

For pumping slurries, White Knight recommends mounting the PEM050 with the liquid inlet/outlet ports

at the bottom of the pump (motor top configuration).

Restriction of Liquid Inlet Line

Restricting the liquid supply of the pump forces the pump to work harder than normal and should be

avoided when possible. Pumping against a closed liquid inlet will cause serious damage to your pump

and will void the pump warranty.

Cross Contamination

PTFE and many other plastics are very porous and may retain chemicals in the pores of the material. Record

chemistries used in a pump to avoid cross contamination.

WARNING: Liquids and Gasses Under Pressure

While in a live system, pumps contain pressurized liquids and gasses. All pressure,

liquid and air must be eliminated via shut off valves before the pump may be removed

or detached from the system.

WARNING: Handling of Chemicals

In the event that hazardous chemicals are used in or around the pump, ensure that

appropriate personal protective equipment is used before handling. Reference the

chemistry’s Material Safety Data Sheet (MSDS) for handling instructions or other

information specific to that chemical.

NEMA 5 Applications

The PEM050 is capable of NEMA 5 classification. However this requires that the end user route the constant air-

cool bleed to a safe location. The port is located on the back of the motor housing and is assembled and shipped

with a muffler to allow for immediate use upon arrival. The exhaust must remain clear of obstruction, or the motor

housing cover will disengage. The exhaust port is ⅛” NPT, recessed in the motor housing.

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4.2 System and Pump Environment Recommendations/Requirements

4.3 Installation Advantages

Abrasive Slurries

Pumping of abrasive slurries will shorten the life of any pump. White Knight high purity pumps are still

warrantied when used in abrasive applications however; wear of components will be accelerated. Normal wear is

not a condition covered by warranty.

Environmental Temperature

This pump is rated to withstand environmental temperatures up to 80°C.

High Discharge Pressure

The PEM050 is capable of discharging at pressures up to 80 psi, allowing the PEM050 to pump directly into

pressurized vessels or lines.

Mounting Orientation

The PEM050 can be mounted in any orientation. For optimal air purge, resulting in highest accuracy, the pump

should be mounted with liquid ports up (motor bottom configuration). When pumping slurries/abrasives the pump

should be mounted with liquid ports on bottom (motor top configuration) to help increase the life of the

diaphragm.

Clean Supply Air (CDA)

White Knight high purity pumps require the use of Class 2 air for particles and moisture per ISO 8573-1. (Use 10

micron filter, maintain -40° C dew point)

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4.4 Installation Instructions

1.

2.

3.

5.

4.

6.

7.

Drill and tap (4) holes to

accept 4, ¼-20 set screws.

Location of holes is critical,

please see dimensional on

page 4 of this manual.

Thread screws partially

into wall, leaving

approximately ¼” of

threads exposed. Align

bracket holes with set

screws and press against

the wall.

Ensure that the pump sits

on all four (4) screws and

is flush against the wall.

Tighten screws until slight

pressure is applied to the

mounting plate. CAUTION:

OVER TORQUEING CAN

CAUSE DAMAGE TO THE

BRACKET AND/OR THE

WALL THE PUMP IS

MOUNTED TO!!

Attach the Quick connect

fitting to the motor housing

Attach airline to the quick

connect. Air supply line

must be ⅛” minimum

orifice, unrestricted to

source. Air supply must be

at least 60 PSI, and not

more than 80 PSI at point

of use.

Attach Liquid Fittings per

manufacturers’ instructions.

Electrical Connections

Use of electronics does not qualify for pumps used in potentially explosive atmospheres. For instruction on the

installation of the electrical connections and setup of this pump, please see section 5 of this manual.

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4.5 Connections

All connections to the PEM050 can be accessed from the front of the pump. The diagram below shows all of the

connections for reference throughout the manual.

Liquid I/O Ports:

Each port can be ether a

refill port or dispense port,

see communication

protocol for more details.

Air Vent / Leak Port:

This port is open to the

surrounding air, and is

available for indicating

leaks. Can be connected

to a leak detect:

Power & I/O Connection:

Power and I/O connections

more details in section 5.

Communication Connection:

Serial RS422/485 or Ethernet

connections available see section

5 for more details.

CDA Input:

This connection supplies the

compressed air to operate the

pilot operated air valves. CDA

pressure should be between 60-

80 PSI.

Position Indicator:

This is a visual indicator used to

verify that motion, and can be

used as a relative indication of

amount dispensed.

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5 Hold Up Volume

5.1 Motor on Bottom Orientation:

The above image shows: Left) PEM050 6 port head, Middle) a 3D rendering of the minimum internal pump

volume, Right) a section view of the minimal internal pump volume (shown in blue). The minimal hold-up volume

consists of the volume that is undrainable out of the lowest port of the pump, shown in blue below the dotted line.

Port Configuration

Minimum Pump

Internal Volume [ mL]

Minimal Hold-Up

Volume [ mL]

Port 2

9.42

8.60

Port 3

14.66

8.60

Port 4

15.07

8.60

Port 5

20.32

8.60

Port 6

20.73

8.60

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5.2 Motor on Top Orientation:

The above image shows: Left) PEM050 6 port head, Right) a 3D rendering of the minimum internal pump volume,

Middle) a section view of the minimal internal pump volume. In the table volume below the dotted line for each

port level is noted assuming all fluid above the bottom of the fluid line will drain out.

Port Configuration

Minimum Pump Internal Volume

below port level[ mL]

Top Ports

11.31

Middle Ports

5.66

Bottom Ports

0

6 Electrical

6.1 Wire Connectors/Wire Leads

The PEM050 has two electrical outputs labeled with roman numerals I and II. These outputs are available in

several configurations:

E1: Twisted Cable output with PVC Jacket to flying leads

E2: Twisted Cable output encapsulated in PFA Tubing to flying leads

E3: Turck EuroFast* 5 pin receptacles mounted on the device without mating cables.

E4: Turck EuroFast* 5 pin receptacles mounted on the device with mating cables to flying leads

•Note: Turck EuroFast connectors are an M12 circular connector that are sealed to prevent

liquid from entering into the motor enclosure, and are O-ring sealed to the motor enclosure.

6.1.1 Connector I: Power Connection Table

Connection

Type

Twisted

Cable Wire

Color

Turck Connector

Pin # - Cable

Wire Color

Description

24 VDC

RED

1 - BROWN

The PEM050 requires a regulated 24 VDC to be supplied to

the pump. This will power both the digital I/O used for the

valves, and the stepper motor.

Analog

2 - WHITE

Analog input; this analog input is not used with the standard

protocol, but is available for use in custom programs.

Lowest Port

Middle Port

Top Port

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Connection

Type

Twisted

Cable Wire

Color

Turck Connector

Pin # - Cable

Wire Color

Description

Ground

BLACK

3 - BLUE

Connect to the common ground for both motor operation

and digital I/O operation.

Digital I/O 1

GREEN

4 - BLACK

Digital input 1 can be configured to be an alarm or software

reset signal using the standard protocol or can be used in

custom programs. Digital 1 is available on all models.

Digital I/O 2

WHITE

5 - GRAY

Digital input 2 can be configured to be an alarm or software

reset signal using the standard protocol, or can be used in

custom programs. Digital 2 is available on 2 port –5 port

models. On 6 port model this port is connected to valve 6

and will not operate correctly if modified.

Note: Pin 2 was previously allocated as a high voltage in. This function has been removed as of Feb 28 2014. All

pumps sold after this date will utilize the new pin function listed above.

6.1.2 Connector II: Communication Connection

Communications are performed using ASCII character commands. The communication protocol is available in

the following configurations:

•Default - Serial RS422 (4 wire full duplex) with option to Configure in RS485 (two wire half

duplex) communication.

•H1 - Ethernet TCIP

6.1.3 RS422/RS485

RS422 Communication

Wire Cable Color

Turk Connector

Pin #

RS485 Communication*

RX+

White with blue

line

2 - WHITE

Data + (Connect RX+ and TX+

together)

TX+

White with orange

line

3 - BLUE

RX-

Blue with white

line

1 - BROWN

Data - (Connect RX- and TX- together)

TX-

Orange with white

line

4 - BLACK

Ground

5 - GRAY

Ground

* RS485 communication must first be configured using RS422 communication. Required settings included

enabling party mode and setting echo mode 1. See communication protocol for more information.

6.1.3.1 Connecting to Multiple Devices Using Party Mode and RS422/RS485

In some cases an application might require using one serial port to communicate to multiple devices. A PEM050

can be put into party mode, which allows the serial communication line to be split to talk to multiple devices over a

single seral port. To connect multiple devices each device is connected as if it was a single device where transmit

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+/- on the computer/PLC is connected to the receive +/- on the PEM050 and the receive +/- on the computer/PLC

connects to the transmit +/- on the PEM050. (make sure to match + to + and –to -)

6.1.4 Ethernet over TCIP

The PEM050 is a device that communicates using a serial communication protocol. The Ethernet communication

is achieved by adding a serial to Ethernet converter inside the PEM050. As a result, Ethernet functionality is

limited to connecting to only one device at a time. The Ethernet connection is available in both Turck connection

and cable out with twisted pairs. The connection table below shows connection information for both connection

options.

PEM050

Connection

Turck Connector Pin #

- Cable Color

Twisted Pair

Wire Color

Ethernet Connector

Pin Position

TX+

1 - Brown

White with Blue line

1

TX-

2 - White

Blue with White line

2

RX+

3 - Blue

White with orange line

3

RX-

4 - Black

Orange with white line

6

6.1.4.1 Configuring Ethernet Converter:

To configure the Ethernet converter, it is recommended to connect the PEM050 on the same network switch as

the computer. The Ethernet converter setup software is found in the Ethernet Setup tab on the PEM050 Interface

or as a standalone Ethernet Configuration Tool; both software packages can be obtained by contacting White

Knight customer service by email: custom[email protected].

Below is shown the steps for configuring the Ethernet Converter using the configuration tool.

STEP 1) Open Configuration tool in either PEM050 interface or in standalone Ethernet configuration tool.

STEP 2) Verify that your computer and the PEM050 are both connected into the same Ethernet switch.

Then click on the search button at the top of the window.

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STEP 3) The search window will open up as shown below. Click on the search button at bottom of search

window.

STEP 4) The search window will close and when the search is completed a list of available devices will be

listed on the main window on the left. Each PEM050 will have a unique MAC address, The MAC

address has been attached to the PEM050 with a tag.

STEP 5) Select the MAC address for the device to be configured and use the Network tab to configure the

Ethernet converter as desired.

STEP 6) Use the Serial tab to modify the serial communication settings if necessary. The serial

communication should be setup as follows:

A) Enable Debug Message: Unchecked.

B) Baud Rate: 9600

C) Parity: None

D) Stop Bits: 1

E) Flow Control: None

STEP 7) Press Save Settings button to set the settings on the Ethernet Converter.

STEP 8) Ethernet configuration is complete; now test communications to verify functionality.

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7 Software Interface

White knight offers a user interface to enable an easy startup with the PEM050 pump. This software should have

arrived with the pump. If a new copy of the software is required, contact White Knight Customer Support for a new

copy of the current software version. customer.support@wkfluidhandling.com.

8 Standard Communication Protocol

The PEM050 is a stepper motor driven metering pump that is able to dispense volumes from 1 milliliter up to 50

milliliters. The PEM050 uses a standard RS-422 full duplex serial communication, which can be configured as a

RS-485 half duplex serial communication port or can be ordered with an Ethernet converter to adapt into Ethernet

networks.

8.1 Communication Syntax & Communication Modes:

The PEM050 can be programed using any standard ANSI terminal emulator. The PEM050 understands

communication as ASCII strings, with control characters. Below is a table of control characters used by the

PEM050. Appendix 1 contains a full table of ASCII characters with their integer and hex values.

ASCII Character

Integer Value

Hex Value

Abbreviation

Terminal Entry Command

Acknowledgment

6

06

ACK

Line Feed

10

0A

Lf

Ctrl + J

Carriage Return

13

0D

Cr

Ctrl + M

Negative Acknowledgement

21

15

NAK

End of Text

3

03

EOT

Ctrl + C

Command Termination: To end a command a termination character needs to be sent to the PEM050. The

command termination character is dependent on the party and checksum modes. See table below. By default,

nether checksum or party modes are enabled, for more information see the party mode and checksum mode

sections of this manual.

Termination Character / Hex Value

Check Sum Mode

CK=0

CK=1

Party

Mode

PY=0

Carriage Return / 0D

(Default)

Line Feed / 0A

PY=1

Line Feed / 0A

Changing the Value of a Variable: Enter the variable followed by an equal sign with the new value for that

variable. Example “DP=1” ending with the termination character.

Requesting Variable Value: Enter “PR” followed by a space with the variable. Then the PEM050 will respond

with the value of the variable. Example “PR DP” followed by the termination character.

The protocol works by changing variable values, and the program will react according to the new value assigned

to the variable. All variables consist of one or two alphanumeric characters. Variables can only be assigned

integer values, do not send any decimal or floating point values; the onboard processor does not

understand decimals.

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Baud Rate: The device baud rate can be changed using the BD variable. After the baud rate is changed then the

device will start responding to the new baud rate, and the parameters should be saved.

Mode Setting

Baud Rate

Notes

BD=48

4800

BD=96

9600

(default)

BD=19

19200

BD=38

38400

BD=11

115200

Not recommended for party mode

•Note: when configuring the serial settings use the following settings along with the configured baud rate:

Data bits: 8, Parity: None, Stop Bits: 1, Flow Control: None.

8.1.1 Communication Modes:

By default, the PEM050 will echo back each character as each character is received. This is helpful when using a

terminal to interact with a single PEM050. However, when connecting to a PLC or if connecting multiple devices in

series then it may be desired to enable one or all of the following communication modes:

Echo Mode: Echo mode controls how the PEM050 responds when communications are received. The echo

mode is set using the EM variable.

Mode Setting

Mode Description

EM=0

All information is echoed back as it is received; both a carriage return & a line feed are

returned when a command accepted. (Full Duplex) (Default)

Note: In this operation mode the communication will also send a command prompt “>” after

any response when there are no errors, and when there is an error the device will respond

with a question mark “?”.

EM=1

Print command (PR) returns the requested information; both a carriage return & a line feed

are returned when a command accepted. (Half Duplex) (Required for RS485

communication)

EM=2

Print (PR) only; device will only respond to print commands. Both a carriage return & a line

feed are returned at the end of a print response. Otherwise no command acceptance

characters are transmitted.

EM=3

PEM050 stores commands as they are received, then echoes the command back when the

command has been accepted.

Party Mode: Party mode enables the multiple PEM050’s to be connected together. The party mode is enabled

using the PY variable. Each PEM050 can be assigned a unique device name (DN). By default, the device name is

configured to an exclamation point (!). The device name can be set by assigning the DN variable the new device

name in parenthesis. Example: setting the device name to the letter A. Command: DN=”A” then end with the

command termination character. Note: the value for DN can be changed any time, and can only be set to a single

alpha numeric character.

Mode Settings

Mode Description

PY=0

Single unit mode. Use this command to take the device out of party mode. Note: if the

device is currently in party mode, then the command will need to start with the device

address. (Default)

PY=1

Turn on party mode. After telling the device to turn on party mode, then a line feed character

needs to be sent to enable party mode. Once party mode is enabled then each device will

only respond to commands that start with the correct device name.

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Example 1: Use PR command to tell the PEM050 to print a message “Hello” out to the serial line.

•Command: APR “Hello”

•Response: Hello

•Description: The starting letter A is the device name, PR represents the print command, and to request a

string to be sent out the letters of the message need to be enclosed by quotation marks. The whole message

should be end with a line feed (hex value 0A). The response sends only the text enclosed in the quotation

marks, followed by both a carriage return & line feed.

Example 2: Use PR command to request the value of dispense port DP.

•Command: APR DP

•Response: 1

•Description: the starting letter of the command is the device name A, the PR letters represent the print

command, followed by the variable that is being requested DP. The command is terminated using a carriage

return or line feed. The response is the value assigned to the variable DP sent as an ASCII character. The

response is terminated by both a carriage return & line feed.

Note: If a command is to be sent to all devices the asterisk “*” is a special device address that all PEM050 will

respond to independent of their unique device name. When the asterisk is use none of the PEM050s in the

network will echo the command to prevent communication issues.

Check Sum Mode: Check sum mode is used to validate that communication is sent correctly across the serial

line. When check sum mode is enabled all communications require an additional character at the end of the

command that represents the checksum value of the command string. If the PEM050 has been placed in party

mode, the command string includes the device name character at the start.

Mode Settings

Mode Description

CK=0

Disable check sum mode. This command is used to get out of checksum mode. If the device

is currently in checksum mode, then the command would need to be followed by the check

sum character. (Default)

CK=1

Enable check sum mode. All commands must end with a checksum character before the line

feed. PEM050 will respond with an acknowledge character (ASCII hex value 06) for received

commands where the checksum matches; for commands that the check sum does not match

a not acknowledge character (ASCII hex value 15) will be returned and the command

ignored. All printed responses from the PEM050 will contain a checksum character at the

end of the response.

The checksum character is calculated in binary as follows:

•Add up the decimal value for each ASCII character in the command to be sent to the PEM050. See ASCII

table in appendix 1.

•Convert to an 8-bit binary number, discarding all bits larger than the 8 bits.

•Take the one’s complement by inverting the binary

•Take the two’s complement by adding 1.

•Set the 8th bit as true,

•Result: the ASCII character that has the same numeric result as the calculation above is the check sum

character. This character can be typed by holding the alt key and type the number using the keypad.

White Knight PEM050 User manual

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