KEYENCE DL-RS1AFD-MH User Manual

RS-232C Communication Unit

DL-RS1A

User's Manual (FD-MH Edition)

Read this manual before using the system in order to
achieve maximum performance.
Keep this manual in a safe place for future reference.

96143E

Introduction

This manual provides an overview of the RS-232C communication unit DL-RS1A and describes the
functions and procedures of the unit.
Be sure to read this manual carefully to ensure safe performance and function of the unit.
Keep this manual in a safe place for future reference.
Ensure that this manual is passed to the end user.

Symbols

The following symbols alert you to important messages. Be sure to read these messages carefully.

It indicates cautions and limitations that must be followed during operation.

It indicates additional information on proper operation.

It indicates tips for better understanding or useful information.

It indicates a hazardous situation which, if not avoided, will result in death or
serious injury.

It indicates a hazardous situation which, if not avoided, could result in death
or serious injury.

It indicates a hazardous situation which, if not avoided, could result in minor
or moderate injury.

It indicates a situation which, if not avoided, could result in product damage
as well as property damage.

DANGER

WARNING

CAUTION

NOTICE

Important

Point

Reference

Safety Precautions

General Cautions

• At startup and during operation, be sure to monitor the functions and performance of the DL-RS1A for proper op erations.

•

We recommend that you take substantial safety measures to avoid any damage in the event that a problem occurs.

• Do not modify the DL-RS1A or use it in any way other than described in the specifications.

• When the DL-RS1A is used in combination with other instrum ents, functions and performance may be degraded,

depending on the operating conditions and surrounding environment.

• Do not use the DL-RS1A for the purpose of protecting the human body.

• Do not change the temperature drastically around the DL-RS1A and other devices including the accessories. Otherwise

condensation may be generated.

Handling Errors

Operating Precautions

■ Installation environment

To use the DL-RS1A correctly and safely, avoid installing it in the following locations. Failure to do so to
may cause fire, electric shock, and malfunction.

• Locations that are humid, dusty, or poorly ventilated

• Locations with a high temperature, such as a place exposed to direct sunlight

• Locations where there are flammable or corrosive gases

• Location where the unit may be directly subjected to vibration or impact

• Locations where water, oil, or chemicals may splash onto the DL-RS1A

• Locations where static electricity is easily generated

■ Noise countermeasures

Isolate the unit from devices that generate high frequency electrical signals, power supply lines, or
power lines. Otherwise, noise could cause a malfunction.

Turn off the power immediately in the following cases. Using the unit in
abnormal conditions could cause fire, electric shock, or accident. Contact the
nearest KEYENCE office for repair.

• If fluids including water, chemicals, or debris enter the unit

• If the unit is dropped or the case is damaged

• If abnormal smoke or odor is present

NOTICE

• Do not use the DL-RS1A with a voltage other than specified voltage, as this
may cause fire, electric shock or equipment failure.

• Do not disassemble or modify the DL-RS1A. Doing so may cause fire or
electric shock.

•

Be sure to turn off the power to the DL-RS1A and any connected devices before
connecting or disconnecting the cables. Failure to do so may damage the unit.

• Do not turn off the power while setting a parameter. Otherwise, the settings
may be partially or completely lost.

WARNING

NOTICE

Contents

Safety Precautions

General Cautions
Handling Errors
Operating Precautions

Installation environment
Noise countermeasures

Before Using the Unit

Checking the Package Contents ............................................................................ .........2

Part Names and Functions....... ........................................................................................ 2

Connecting the Unit to Sensor Amplifiers

Mounting the Unit ............................................................................................................. 3

Mounting the unit on the DIN rail.................................................................................................3

Connecting the Unit to Sensor Amplifiers ........................................................................ 4

Available sensor amplifiers .........................................................................................................4

Connecting the DL-RS1A to DIN rail mount sensor amplifiers.................................................... 4

Connecting the Unit to External Devices

Communication Terminal Block ....................................................................................... 5

Terminal connection.................................................................................................................... 5

Connection wiring........................................................................................................................5

Optional cable............................................................................................................................. 5

Input circuit diagram ...................................................................................................................6

Communication Specifications

Communication Specifications.................................. .......................................................6

Sensor Amplifier ID Number Assignments.................................... ...................................6

DIN rail mount sensor amplifiers................................................................................................. 6

Commands and Responses

Overview of Commands and Responses...................................... ...................................7

Command format.........................................................................................................................7

Response ....................................................................................................................................7

Error response.............................................................................................................................8

Reading.................................... ........................................................................................ 8

Read from the specified sensor amplifier (SR command).......................................................... 8

Read all data from all sensor amplifiers (M0 command) ............................................................8

Read output states and data from all sensor amplifiers (MS command).................................... 9

Read with external input to the DRQ terminal (DRQ read)..........................................................9

Writing .............................................................................................................................. 9

Write to the specified sensor amplifier (SW command).............................................................. 9

Write to all sensor amplifiers (AW command)............................................................................. 9

Parameters of Commands and Responses

Electromagnetic Digital Flow Sensor FD-MH Series ...................................................... 10

Communication commands ......................................................................................................10

ID numbers................................................................................................................................10

Data numbers............................................................................................................................10

Control outputs.......................................................................................................................... 12

Error numbers............................................................................................................................13

Communication Response Time

Communication Response Time and Time Chart ................................................... .......13

SR command.............................................................................................................................13

M0 command and MS command.............................................................................................. 13

DRQ input..................................................................................................................................14

SW command and AW command............................................................................................. 14

Time Frames of Communication Response Time ................................................... .......14

T2 (DL-RS1A data processing time) .........................................................................................14

T3 (Command send time from external device)........................................................................14

T4 (DL-RS1A command processing time) ................................................................................15

T5 (Response send time from DL-RS1A) ..................................................................................15

T6 (Sensor amplifier settings change time)...............................................................................15

Specifications

Performance Specifications ........................................................................................... 16

Communication Specifications.................................. .....................................................16

Dimensions................................................................ ..................................................... 16

When the unit is mounted on the DIN rail..................................................................................16

When the optional fixture (OP-60412) is used...........................................................................16

Troubleshooting

ASCII Code Table

96143E

1

Before Using the Unit

Checking the Package Contents

Before using the DL-RS1A, check that the following items are all included.

All possible care was taken in packaging before shipment. However, in the event of defective broken,
or missing items, please contact your nearest KEYENCE office.

Part Names and Functions

End unit x 2

OP-26751

RS-232C communication unit

DL-RS1A

Expansion connector cover

Switch protection sticker

Instruction manual

102#345

6

G

D

3.

Sensor amplifier connecto

r

(for panel mount type/
large display type)*

10

2N345

6

* A sticker is attached as factory default.

4. Communication
status indicators (green)

5. Alarm indicator (red)

6. Read/write
setting switch

7. Power indicator (green)

8. Communication terminal block

1.

Communication setup switch

2.

Sensor amplifier connector

(for DIN rail mount type)

Before Using the Unit

(1) Communication setup switches

You can use different ON/OFF combinations to configure the communication settings.

• Make sure you cycle the power to the unit after modifying the
communication settings. The modifications are not applied to the
unit until it is powered down and power has been reapplied.

• Place the switch protection sticker supplied with the unit over the
switches after you modify the settings.

(2) Sensor amplifier connector (for DIN-rail mount type)

Use this connector to connect DL-RS1A to a DIN-rail mount type sensor amplifier.

(3) Sensor amplifier connector (for panel mount type)

Use this connector to connect DL-RS1A to a panel mount type sensor amplifier.
The optional extension cable (OP-35361) must be used for connection.

You cannot connect DL-RS1A simultaneously to a DIN-rail mount type sensor amplifier and
a panel mount type sensor amplifier.

(4) Communication status indicators

These indicators show the communication status of DL-RS1A.

Setting Switch No. Combination

Baud rate

1

* Factory default positions are shown.

Do not use combinations other than those shown above for switches
1, 2, and 3.

2

3

Data bit length

4

* Factory default positions are shown.

Parity

5

* Factory default positions are shown.

6

ON ON

ON

ON

ON

123 123 123 123 123

2400bit/s 4800bit/s

9600bit/s*19200bit/s 38400bit/s

Important

ON4ON

4

8 bit* 7 bit

ON56ON56ON56ON

56

None* Even Odd None

Important

Switch protection sticker

Point

Indicator Behavior

SD Lights up in green while data is being transmitted.
RD Lights up in green while data is being received.

2

Before Using the Unit

(5) Alarm indicator

This indicator lights up in red.
For information on the actions you should take when an alarm occurs, refer to "Troubleshooting" (page 17).
After turning on the power, the alarm indicator lights for the following amount of time, and
communication cannot be performed during this time.

(6) Read/write setting switch

Use this switch to allow or prohibit writing to the sensor amplifiers. (You can only manipulate this
switch while the unit is active (turned on).)

(7) Power indicator

Lights up in green when the unit has power.

(8) Communication terminal block

Use the terminals on the terminal block to attach communication cables for connecting the unit with external devices.

* Recommended communication cable

KPEV-SP(1P) wire with balanced type twisted shield (strand wire)
Nominal cross-section area 0.16mm

2

(AWG25) min.

A terminal cover is attached to the terminal block.
The terminal cover must be placed over the terminal block when you finish connecting the cables.

The terminals for SG (Nos. 1, 4, and 5) are used in common with the blue wire of the sensor am plifier
main unit.

No. of connected units Incommunicable time

1 to 5 Approx. 2 s

6 to 10 Approx. 4 s

11 to 15 Approx. 6 s

Position of the switch Description

R

(Factory default position)

The unit can read data from the sensor amplifiers. However, it
cannot write settings to the sensor amplifiers.

RW

The unit can both read data from and write settings to the
sensor amplifiers.

SG

RD

SD

SG

SG

DRQ

Communication cable

To external device

KPEV-SP(1P) wire with balanced
type twisted shield (strand wire)

Terminal No.

Term inal Description

1SG

Connects to the shielded wire of the communication cable.

The terminals for SG (Nos. 1, 4, and 5) are internally shor t-circuited.
2 RD (input) Connects to the SD terminal of an external device via a co mmunication cable.
3 SD (output) Connects to the RD terminal of an external device via a communication cable.
4 SG The terminals for SG (Nos. 1, 4, and 5) are internally short-circuited.
5 SG The terminals for SG (Nos. 1, 4, and 5) are internally short-circuited.

6 DRQ (input)

When there is a short-circuit between DRQ and SG, the sensor amplifier data is

transmitted even without a command from the external device.

Point

Reference

Connecting the Unit to Sensor Amplifiers

This section describes how to mount a DL-RS1A and connect it to sensor amplifiers.

Mounting the Unit

■ Mounting the unit on the DIN rail

1 Fit the tab of the lower part of the unit to the

DIN rail. While inserting the unit in the

direction of arrow (1), push the body down in

the direction of arrow (2).

2 To detach the unit, lift the unit in the direction

of arrow (3) while pushing it in the direction

of arrow (1).

When using the mounting bracket (OP-60412), install it as shown in the illustration below.

(1)

(3)

(2)

Mounting bracket：OP-60412

3

Connecting the Unit to Sensor Amplifiers

Connecting the Unit to Sensor Amplifiers

You use DL-RS1A by connecting it to sensor amplifiers. The connection method varies according to
the mounting type of the sensor amplifiers.
Before connecting DL-RS1A, you must install the main unit and expansion units of the sensor
amplifiers. For information on installing the sensor amplifiers, refer to the user's manual supplied with
the sensor amplifiers.

■ Available sensor amplifiers

*1 You cannot connect DL-RS1A to panel mount sensor amplifiers.

Make sure that the sensor amplifiers are turned off before connecting the RS­232C communication unit DL-RS1A to them. Connecting the unit while the
sensor amplifiers are turned on may damage the unit.

Name Type of amplifier Main unit

Expansion unit

Max. connectable number

Electromagnetic digital

flow sensor

FD-MH Series

*1

DIN rail mount

FD-MA1(A)

FD-MA1(A)P

FD-MA2(A)

FD-MA2(A)P

11 units
(Main: 1, Expansion: 9, DL-RS1A: 1)

NOTICE

Connecting the Unit to Sensor Amplifiers

■ Connecting the DL-RS1A to DIN rail mount sensor amplifiers

1 Remove the expansion protective cover from the sensor amplifier that you want to connect to

the DL-RS1A.

2 Mount the DL-RS1A on the DIN rail and connect it to the sensor amplifier.

Make sure there is no space between the unit and the sensor amplifier.

3 Mount the end units (OP-26751, two units included) on either side of the sensor amplifier and

DL-RS1A unit and tighten the two screws on the top of each end unit.

(You can mount the end units in the same way you mount DL-RS1A.)

Sensor amplifier

Expansion protective cove

r

Sensor amplifier

DL-RS1

A

Connector

Check that the sensor amplifier connector (for DIN
rail mounting) located on the side of DL-RS1A is
not installed at an angle as shown in the
illustration to the right. Connecting the unit with
its connector installed at an angle to a sensor
amplifier may damage the unit.

NOTICE

Sensor amplifier connector

RS-232C communication unit DL-RS1

A

End unit

End unit

Make sure you firmly insert DL-RS1A all the way into the sensor amplifier.
Turning the power on when the unit is not inserted straight or firmly connected
may damage the unit.

NOTICE

4

Connecting the Unit to External Devices

Communication Terminal Block

You can connect external devices such as a PC or PLC to the communication terminal block of
DL-RS1A via the communication cables.

■ Terminal connection

* Recommended communication cable

KPEV-SP(1P) wire with balanced type twisted shield (strand wire)
Nominal cross-section area 0.16mm

2

(AWG25) min.

A terminal cover is attached to the terminal block.
The terminal cover must be placed over the terminal block when you finish connecting the cables.

The terminals for SG (Nos. 1, 4, and 5) are used in common with the blue wire of the sensor am plifier

main unit.

● Crimp-type terminal

Use the Y or round terminal for wiring to the I/O terminal.
Use the Y or round terminal with the following dimensions.

Y terminal

Round terminal

SG

RD

SD

SG

SG

DRQ

Communication cable

To external device

KPEV-SP(1P) wire with balanced
type twisted shield (strand wire)

Terminal No.

Term inal Description

1SG

Connects to the shielded wire of the communication cable.

The terminals for SG (Nos. 1, 4, and 5) are internally shor t-circuited.
2 RD (input) Connects to the SD terminal of an external device via a co mmunication cable.
3 SD (output) Connects to the RD terminal of an external device via a communication cable.
4 SG The terminals for SG (Nos. 1, 4, and 5) are internally short-circuited.
5 SG The terminals for SG (Nos. 1, 4, and 5) are internally short-circuited.

6 DRQ (input)

When there is a short-circuit between DRQ and SG, the sensor amplifier data is

transmitted even without a command from the external device.

Point

Reference

Excerpted from dimensions of the Y terminal areas
B: Outer size of Y area
d: Width of inner Y area

(joint area with screw)

Applicable dimension
B: 6mm max.
d: 3.2mm min.

Excerpted from dimensions of the round terminal areas
B: Outer diameter
d: Inner diameter

(joint area with screw)

Applicable dimension
B: 6mm max.
d: 3.2mm min.

B

B

φd

d

Connecting the Unit to External Devices

■ Connection wiring

Refer to the connection wiring diagram shown below when connecting DL-RS1A to an external
device such as a PC.

• The length of the communication cable must not exceed 15 m.

•

Connect the shield wire of the communication cable to the SG terminal of the external device.

• Make sure that the shield wire does not touch other signal wires or the other terminals on
the terminal block.

■ Optional cable

An optional cable shown below is used to connect to an external device such as a PC that has
a D-sub 9-pin I/O connector.

Part number: OP-81283

Pin layout for D-sub 9-pin connector

*1 Pin numbers 4 and 6 are connected inside the connector.
*2 Pin numbers 7 and 8 are connected inside the connector.
*3 Two cables (black and black/white) are connected to the pin number 5.

SD

RD

DR

ER

RS

CS

SG

2

1

3

4

5

6

RD

SG

SD

SG

SG

DRQ

DL-RS1A

External device

(D-sub 9-pin)

Shield

Point

Pin No. Cable color

1-

2 Red/white

3Red

4

*1

-

5 Black, black/white

*3

6*1-

7

*2

-

8

*2

-

9-

33.2
25

16

5000

39.5
1

50

φ7.1

Front

5

96

1

5

Connecting the Unit to External Devices

Sample wiring

*1 Insulate either the black or black/white cable that is not used.
*2 Connect the shield wire to the SG terminal of DL-RS1A. (Shield wire is connected to the

connector casing.)

The green and green/white-striped wires are not connected to any of the connector pins.

■ Input circuit diagram

* The terminals for SG (Nos. 1, 4, and 5) are connected internally with the blue wire of the sensor

amplifier main unit.

2

3

4

5

6

7

RD

Red/White

Red

SD

DR

SG

ER

RS

8CS

2

1

3

4

5

6

RD

SG

SD

SG

SG

DRQ

Black, Black/White

*

1

DL-RS1A

(Communication terminal block)

External device

(D-sub 9-pin)

Shield

*2

Reference

Main circuit

(Short-circuit current: 1 mA max.)

6 (DRQ)

+5V

1,4,5 (SG)

*

Communication Specifications

This section provides the communication specifications of DL-RS1A and describes how to configure the unit.

Communication Specifications

The following table lists the communication specifications for DL-RS1A.

For communication settings, refer to pa ge 2.

Sensor Amplifier ID Number Assignments

When the main sensor amplifier that is connected to DL-RS1A supports expansion units, the main
sensor amplifier ID number "00" is automatically assigned to the main unit and ID numbers "01 to 09"
to the expansion units.

You cannot change the assignment of sensor amplifier ID numbers.

■ DIN rail mount sensor amplifiers

Item Specifications

Communication method Full duplex
Synchronization method Asynchronous
Transmission code ASCII
Communication speed 2400, 4800, 9600, 19200, 38400 bit/s (Factory default: 9600 bit/s)
Data bit length 7 or 8 bits (Factory default: 8 bits)
Parity check None, even, odd (Factory default: none)
Stop bit length 1 bit

Data delimiter

Receive: automatically detect CR or CR + LF
Send: fixed to CR + LF

Point

ID No. 00

Main Exp. Exp. Exp. Exp.

01 02 08 09

Sensor amplifier DL-RS1A

6

Commands and Responses

Overview of Commands and Responses

■ Command format

You can send specific commands based on ASCII codes from an external device to DL-RS1A.
For information on the parameters used in the command, refer to "Parameters of Commands and
Responses" (page 10).

Sample command format structure

(1) With the first two bytes, specify the communication command.
(2) Specify the ID number assigned to the target sensor amplifier using two digits (ASCII characters).
(3) Specify the data number for the data you want to read from or write to the sensor amplifier using

three digits (ASCII characters).

(4) Insert CR or CR + LF as the command delimiter.

You must use commas (,) to separate (1), (2), and (3).

To read the "Detection mode (data number: 101)" from an expansion unit of an active
GT-70A Series (ID number: 06):

From an external device, 11-byte data will be sent to the DL-RS1A.

The last byte of the command you send must be CR (0DH) or LF (0AH). Specifying a value
other than CR or LF results in an error response (error number: 00). For information on the
error responses, refer to "Error numbers" (page 13).

ID No. 00

Main Exp. Exp. Exp. Exp.

01 02 08 09

Sensor amplifier DL-RS1A

External device like PLC or PC

Response

or

error response

Command or DRQ input

S

(1) (2) (3) (4)

R CR LFID No. Data No.

,,

Important

Example

S

(53H) (52H) (2CH)(31H) (30H) (31H)(0DH)(0AH)(2CH)(30H) (36H)

R CR LF0 6 1 0 1

,,

Command :

S

(53H)

,

(2CH)

R

(52H)

0

(30H)

6

(36H)

1

(31H)

,

(2CH)

0

(30H)

1

(31H)

LF

(0AH)

CR

(0DH)

ASCII character conversion :

Data memory 0

Data memory 1

Data memory 2

Data memory 3

Data memory 4

Data memory 5

→ 5352

H

Value to store in
data memory (hexadecimal)

→ 2C30H

→ 362CH

→ 3130H

→ 310DH

→ 0A00H

bit
15

bit

0

Important

Commands and Responses

■ Response

When DL-RS1A successfully receives a command from the external device, it automatically returns a
response based on ASCII codes.
For information on the parameters used in the response, refer to "Parameters of Commands and
Responses" (page 10).

Sample response structure

(1) Contains the same communication command as the received command.
(2) Contains the same ID number as the received command.
(3) Contains the same data number as the received command.
(4) Contains the data that DL-RS1A retrieved from the specified sensor amplifier. Contains maximum

of 10 bytes according to the specified data number (3).

(5) Contains CR + LF as the response delimiter.

When the command format "SR,06,101CRLF" is sent to the GT-70A (ID number: 06) in
operation and the response indicating that the Detection mode is "Peak hold" is received:

DL-RS1A sends the response to the external device.

S

(1) (2) (3) (4) (5)

R ID No. Data No.

,,

CR LFData

,

Example

S

(53H) (52H) (2CH)(31H) (30H) (31H)(2CH)(3CH) (36H)

R 0 6 1 0 1

,,

(2CH)(32H) (0DH) (0AH)

2 CR LF

,

Response format :

Peak hold

S

(53H)

,

(2CH)

R

(52H)

0

(30H)

6

(36H)

1

(31H)

,

(2CH)

0

(30H)

2

(32H)

LF

(0AH)

CR

(0DH)

ASCII character conversion:

5352

H →

Value to store in
data memory
(hexadecimal)

2C30H →

362C

H →

3130

H →

320D

H →

0A00

H →

bit
15

bit

0

1

(31H)

312CH →

,

(2CH)

7

Commands and Responses

■ Error response

If DL-RS1A could not receive a command from the external device or if the received command
included an error, it automatically returns an "error response" based on ASCII codes.
For information on the parameters used in the error response, refer to page 10.

Sample error response structure

(1) Contains "ER".
(2) Contains the same communication command as the received command.
(3) Contains a two-digit error number (ASCII characters) indicating the error type.

For information on the error numbers, refer to "Error numbers" (page 13).

(4) Contains CR + LF as the error response delimiter.

An error response indicating an "ID number error" as a response to the command
"SR,06,101CRLF":

DL-RS1A sends the error response to the external device.

E

(1) (2) (3)

R

,,

Error No.

SR

(4)

CR LF

Example

E

(45H) (52H) (2CH)(2CH)(53H) (52H)

R S R

(36H) (35H)

6 5

,,

Error response :

ID No. error

E

(45H)

,

(2CH)

R

(52H)

S

(53H)

R

(52H)

6

(36H)

,

(2CH)

5

(35H)

CR

(0DH)LF(0AH)

ASCII character conversion :

4552

H →

Value to store
in data memory

2C53H →

522C

H →

3635

H →

0D0A

H →

bit
15

bit

0

(0DH) (0AH)

CR LF

Commands and Responses

Reading

External devices such as PLC's use the following communication commands to read data from
DL-RS1A.

■ Read from the specified sensor amplifier (SR command)

Command

Response

Error response

* The data length is different depending on the data being read. (Up to 10 characters)

■ Read all data from all sensor amplifiers (M0 command)

Command

Response

Error response

* The data length is different depending on the model.

SR CR LFID No. Data No.

,,

SR Data*ID No. Data No.

,, ,

CR LF

ER,SR

Error No.,CR LF

M 0 CR LF

M0 CR LF

Data of the sensor
amplifier with ID:00*

,

Data of the sensor
amplifier with ID:01*

……

,

Data of the sensor amplifier
with the last ID No.*

,,

ER CR LF

,M0,

Error No.

8

Commands and Responses

■

Read output states and data from all sensor amplifiers (MS command)

Command

Response

Error response

* The data length is different depending on the model.

■ Read with external input to the DRQ terminal (DRQ read)

You can send an input signal (by short-circuiting DRQ (terminal number 6) and SG (terminal number
1, 4, or 5)) from an external device such as a PLC instead of sending a command.

Response

Error response

* The data length is different depending on the model.

M S CR LF

M

S

Control

output

Control

output

Control

output

CR LF

Data of the sensor
amplifier with ID:00*

,, ,,

Data of the sensor
amplifier with ID:01*

…

Data of the sensor
amplifier with the last ID No.*

,,

Sensor amplifier with ID:00 Sensor amplifier with ID:01 Sensor amplifier with the last ID No.

** *

ER CR LF

,MS,

Error No.

2 ms min.

Input signal

ON

OFF

SG

RD

SD

SG

SG

DRQ

DR

Control
output

Control

output

Control

output

CR LF

Data of the sensor
amplifier with ID:00*

,, ,,

Data of the sensor
amplifier with ID:01*

…

Data of the sensor
amplifier with the last ID No.*

,,

Sensor amplifier with ID:00 Sensor amplifier with ID:01 Sensor amplifier with the last ID No.

** *

ER CR LF

,DR,

Error No.

Commands and Responses

Writing

External devices such as PLC's use the following communication commands to write data to
DL-RS1A.

Attempting to write data with "read-only" attribute results in a communication error and an
error response (error number: 22).

■ Write to the specified sensor amplifier (SW command)

Command

Response

Error response

* The data length is different depending on the data being written.

■ Write to all sensor amplifiers (AW command)

Command

Response

Error response

* The data length is different depending on the data being written.

Point

SW CR LFID No. Data No.

,,

Setting data*

,

SW CR LFID No. Data No.

,,

ER CR LF

,SW,

Error No.

AW CR LFData No.

,

Setting data*

,

AW CR LFData No.

,

ER CR LF

,AW,

Error No.

9

Parameters of Commands and Responses

This section describes the parameters used with various commands and responses.

Electromagnetic Digital Flow Sensor FD-MH Series

■ Communication commands

There are two types of communication commands: read commands and write commands.

■ ID numbers

This parameter is used with communication commands "SR" and "SW". Specify the ID number of the
target sensor amplifier using two digits (ASCII characters).
Example: Sensor amplifier of ID number 00 = 00, sensor amplifier of ID number 07 = 07

Communication

command

Attribute Description

SR

Read

Reads the data for the specified data number from the sensor amplifier with the
specified ID number.

M0

Reads all of the instantaneous flow rate (current value) data that DL-RS1A
periodically retrieves from all sensor amplifiers.

MS

Reads the control output state and instantaneous flow rate (current value) data
that DL-RS1A periodically retrieves from all sensor amplifiers.

DR

Reads the control output state and instantaneous flow rate (current value) data
that DL-RS1A periodically retrieves from all sensor amplifiers when a DRQ input
is received.

SW

Write

Writes setting data for the specified data number into the sensor amplifier with
the specified ID number.

AW Writes setting data for the specified data number into all sensor amplifiers.

Parameters of Commands and Responses

■ Data numbers

Specify the data number using three digits (ASCII characters).

● Read-only data

The following table lists the types of data that can only be read from FD-MH Series sensor amplifiers.

Writing read-only data results in a communication error (error number: 22).

*1 In the Data for mat column, "*" signifies a number from "0 to 9".

Point

Data

number

Data name Sensor head Data format

*1

Number

of bytes

Attribute

*2

Data range

000

Instantaneous flow rate

(current value)

FD-MH10 **.** 5

R

00.00 to 99.99

*3

FD-MH50

FD-MH100

***.* 5 000.0 to 999.9

*3

FD-MH500 ****.* 6 0000.0 to 9999.9

*3

001 Integrated flow quantity

FD-MH10 *******.** 10

R

0000000.00 to 4294967.29

*4

FD-MH50

FD-MH100

********.* 10 00000000.0 to 42949672.9

*4

FD-MH500 ********* 9 000000000 to 429496729

*4

002

Instantaneous flow rate

(peak hold value)

FD-MH10 **.** 5

R

00.00 to 99.99

*3

FD-MH50

FD-MH100

***.* 5 000.0 to 999.9

*3

FD-MH500 ****.* 6 0000.0 to 9999.9

*3

003

Instantaneous flow rate

(bottom hold value)

FD-MH10 **.** 5

R

00.00 to 99.99

*3

FD-MH50

FD-MH100

***.* 5 000.0 to 999.9

*3

FD-MH500 ****.* 6 0000.0 to 9999.9

*3

005

Control output,

integration pulse

output,

error alarm output

states

-

*1R

0: Outputs 1, 2, 3 OFF

1: Output 1 ON, 2 OFF, 3 OFF

2: Output 1 OFF, 2 ON, 3 OFF

3: Output 1 ON, 2 ON, 3 OFF

4: Output 1 OFF, 2 OFF, 3 ON

5: Output 1 ON, 2 OFF, 3 ON

6: Output 1 OFF, 2 ON, 3 ON

7: Outputs 1, 2, 3 ON

006

Integration reset input

or bank switching input

*1R

0 : Off

1 : On

007 Bank switching state * 1 R

0: Bank A

1: Bank B

008

Sensor amplifier error

state

**** 4 R 0 to 1149

*5

010

Connected

sensor head

*1R

0

*6

: FD-MH10

1

*6

: FD-MH50

2

*6

: FD-MH100

3

*6

: FD-MH500

011

Temperature sensor

connection

*1R

0

*6

: Not connected

1

*6

: Connected

015

Temperature (current

value)

***.* 5 R 000.0 to 999.9

*7

016

Temperature

(peak hold value)

***.* 5 R 000.0 to 999.9

*7

017

Temperature

(bottom hold value)

***.* 5 R 000.0 to 999.9

*7

10

Parameters of Commands and Responses

*2 R: Indicates that the data type can only be read from the sensor amplifiers.
*3 When the instantaneous flow rate exceeds the indicated data range, "99.99", "999.9", or "9999.9"

is returned as the data. Similarly, when the sensor amplifier displays ErH, ErS, or rEv, "EE.EE",
"EEE.E", or "EEEE.E" is returned as the data.
Regardless of the display mode specified on the sensor amplifiers, the data for the "rESo" mode
is returned.

*4 Regardless of the integration display unit specified on the sensor amplifiers, the data is read

with the minimum display unit.
When the integrated flow quantity exceeds the indicated maximum value, the maximum value is
returned as the data.

*5 The data number “008” can be read to check the error status of the sensor amplifiers.

Convert the five digit number (ASCII characters) read from the sensor amplifiers to a binary
number and check the ON/OFF state of each bit to
check the error contents.

For information on each error, refer to "FD-MH Series User's Manual".

•

When the data read from a sensor amplifier is "0068":
"68" converted to binary number is "0000 0100 0100".

Therefore, this data indicates that a "reverse current error" and an "overcurrent error"
have occurred at the sensor amplifier from which it was read.

•

If no error has occurred at the sensor amplifier, the data "0000" is returned.

*6 When the sensor amplifiers display ErH, "E" is returned as the data.
*7 When a temperature sensor is not connected, "EEE.E" is returned as the data.

When the temperature exceeds the indicated maximum value, "999.9" is returned as the data.

Bit Error contents of sensor amplifiers

0 Head error (ErS)
1 Head connection error (ErH)
2 Overcurrent error (ErC)
3 EEPROM error (ErE)
4

Not used

5
6 Reverse current error (rEv)
7 Not used
8 Minimum temperature error
9 Maximum temperature error

10 Temperature sensor connection error (Err tEMP)

11 to 15 Not used

Reference

Bit 6: Reverse current error Bit 2: Overcurrent erro

r

Parameters of Commands and Responses

● Read/write data

The following table lists the types of data that can be read from and written to FD-MH Series sensor
amplifiers.

Data

No.

Data name

Sensor

head

Data

format

*1

No. of

bytes

Attribute

*2

Data range

Initial value

020

Integration reset
request

-

*

1

R

0 - 1: Last written value

0

W

0: Do not perform reset
1: Perform reset

*3

021

Reset during hold
request
(instantaneous flow)

*

1

R

0 - 1: Last written value

0

W

0: Do not perform reset
1: Perform reset

*3

022

Reset during hold
request
(temperature
display)

*

1

R

0 - 1: Last written value

0

W

0: Do not perform reset
1: Perform reset

*3

030

Instantaneous flow
rate setting 1

FD-MH10 **.** 5

R/W

00.00 to 20.00

*4

03.00

FD-MH50 ***.* 5

000.0 to 100.0

*4

015.0

FD-MH100 ***.* 5

000.0 to 200.0

*4

030.0

FD-MH500 ***.* 5

000.0 to 999.9

*4

100.0

031

Instantaneous flow
rate setting 2

FD-MH10 **.** 5

R/W

00.00 to 20.00

*4

10.00

FD-MH50 ***.* 5

000.0 to 100.0

*4

050.0

FD-MH100 ***.* 5

000.0 to 200.0

*4

100.0

FD-MH500 ***.* 5

000.0 to 999.9

*4

200.0

032

Instantaneous flow
rate setting 3

FD-MH10 **.** 5

R/W

00.00 to 20.00

*4

13.00

FD-MH50 ***.* 5

000.0 to 100.0

*4

065.0

FD-MH100 ***.* 5

000.0 to 200.0

*4

130.0

FD-MH500 ***.* 5

000.0 to 999.9

*4

200.0

033

Instantaneous flow
rate setting 4

FD-MH10 **.** 5

R/W

00.00 to 20.00

*4

20.00

FD-MH50 ***.* 5

000.0 to 100.0

*4

100.0

FD-MH100 ***.* 5

000.0 to 200.0

*4

200.0

FD-MH500 ***.* 5

000.0 to 999.9

*4

500.0

034

Integrated flow
quantity setting 1

-

**** 4 R/W

0000 to 9999 0150

035

Integrated flow
quantity setting 2

**** 4 R/W

0000 to 9999 9999

036

Temperature setting
lower limit

***.* 5 R/W

000.0 to 099.9

*5

005.0

037

Temperature setting
upper limit

***.* 5 R/W

000.1 to 100.0

*6

080.0

040 Detection mode

*1R/W

0: F-1
1: F-2
2: F-3
3: A-1
4: A-2

0

041

Integration
direction

*1R/W

0: Increment
1: Decrement

0

042

Time-out time for
output 2 (unit: s)

** 2 R/W

01 to 99 10

043 Output mode

*1R/W

0

Data Output 1 Output 2 Output 3

0 N.O. N.O. N.O.

1 N.C. N.O. N.O.

2 N.O. N.C. N.O.

3 N.C. N.C. N.O.

4 N.O. N.O. N.C.

5 N.C. N.O. N.C.

6 N.O. N.C. N.C.

7 N.C. N.C. N.C.

11

Parameters of Commands and Responses

*1 In the Data format column, "*" signifies a number from "0 to 9".
*2 Indicates that the data can only be read from (R), can only be written to (W), or can be both read

from and written to (R/W) the sensor amplifiers.

*3 Since each reset request is a level action, resets are continuously performed as long as the

value is set to 1.
Make sure you send a command format that writes 0 to the sensor amplifiers again after
receiving a response format.

*4 Regardless of the display mode specified on the sensor amplifiers, the range of configurable data

is the same as the "rESo" mode.

044

Integrated flow
quantity unit

-

*1R/W

2

045 Response time

*1R/W

0: 0.5
1: 1
2: 2.5
3: 5
4: 10
5: 30
6: 60

3

046 Display mode

*1R/W

0: Std
1: rESo

FD-MH10: 0

FD-MH50: 1
FD-MH100: 1
FD-MH500: 0

047 Hysteresis

FD-MH10 *.** 4

R/W

0.00 to 9.99

*4

0.10

FD-MH50 **.* 4

00.0 to 49.9

*4

00.5

FD-MH100 **.* 4

00.0 to 99.9

*4

01.0

FD-MH500 ***.* 5

000.0 to 499.9

*4

005.0

048

Bank switching
function

-

*1R/W

0: OFF
1: ON

0

049

Flow indicator color

*1R/W

0: Red for ON, green for OFF
1: Green for ON, red for OFF

1

050 Power save mode

*1R/W

0: Do not use
1: Use

0

051

Analog output
selection

*1R/W

0: Standard
1: Free range analog

0

052

*7

Free range
analog lower limit

FD-MH10 ** 2

R/W

00 to 20 (Configurable unit: 1) 00

FD-MH50 *** 3

000 to 100 (Configurable unit: 5) 000

FD-MH100 *** 3

000 to 200 (Configurable unit: 10) 000

FD-MH500 **** 4

0000 to 1000 (Configurable unit: 50) 0000

053

*7

Free range
analog upper limit

FD-MH10 ** 2

R/W

00 to 20 (Configurable unit: 1) 10

FD-MH50 *** 3

000 to 100 (Configurable unit: 5) 050

FD-MH100 *** 3

000 to 200 (Configurable unit: 10) 100

FD-MH500 **** 4

0000 to 1000 (Configurable unit: 50) 0500

054 Keylock function

-

*1R/W

0: Unlock
1: Locked

0

060

Factory reset
(initialization)

*1

R 0 - 1: Last written value

0

W

0 o 1: Perform initial reset

*8

Data

No.

Data name

Sensor

head

Data

format

*1

No. of

bytes

Attribute

*2

Data range

Initial value

Data FD-MH10 FD-MH50 FD-MH100 FD-MH500

00.01

Cannot be set Cannot be set Cannot be set

1 0.1 0.1 0.1

Cannot be set

21 1 1 1

310 10 10 10

4 100 100 100 100

5

Cannot be set

1000 1000 1000

6

Cannot be set Ca nnot be set Cannot be set

10000

Parameters of Commands and Responses

*5 When setting this value to 000.0, no alarm output is made even if the temperature falls below the

indicated temperature setting lower limit; an alarm output is made only when the temperature
exceeds the upper limit.

*6 When setting this value to 100.0, no alarm output is made even if the temperature exceeds the

indicated temperature setting upper limit; an alarm output is made only when the temperature falls
below the lower limit.

*7 To read or write this data type, the analog output of the sensor amplifiers must be set to "Free range

analog" (using data number 051).
Changing the Free range analog upper limit/lower limit is invalid when the analog output is set to
"Standard".

*8 The command is executed only when the setting of the sensor amplifiers is changed from 0 to 1. To

re-execute the command, first change the setting to 0, then change it to 1.

■ Control outputs

This parameter is used with communication command "MS" and DRQ input. Specify the ON/OFF
state of the control output, integrated pulse output, and error alarm output using a one-digit value
(ASCII character).

Data Description

0 Outputs 1, 2, 3 OFF
1 Output 1 ON, 2 OFF, 3 OFF
2 Output 1 OFF, 2 ON, 3 OFF
3 Output 1 ON, 2 ON, 3 OFF
4 Output 1 OFF, 2 OFF, 3 ON
5 Output 1 ON, 2 OFF, 3 ON
6 Output 1 OFF, 2 ON, 3 ON
7 Outputs 1, 2, 3 ON

12

Parameters of Commands and Responses

■ Error numbers

The following table lists the error numbers that are returned as error responses when errors occur in
the communication between DL-RS1A and FD-MH Series sensor amplifiers.
Each error number is identified with two digits (ASCII characters).

Commands can only be sent or received if a response is returned from DL-RS1A within 500 ms.
Take the appropriate action to resolve the problem by referring to "Troubleshooting" (page 17).

Error No.

Error name Problem Action

00

Invalid command
error

An invalid command was
received.

Make sure that the external device has
sent a command listed in
"Communication commands" (page 10).

20 Data length error

Data with the correct length was
not received.

Make sure that the external device has
sent either "CR" or "CR + LF" as a data
delimiter.

21

Number of
parameters error

The correct number of parameters
for the command was not
received.

Make sure that the number of parameters
and the positions of the commas used as
data delimiters conform to the command
format shown in "Commands and
Responses" (page 7).

22 Parameter error

·

A parameter exceeds its range of value.

·

The external device is trying to write a
data type that cannot be written.

·

The external device is trying to read a
data type that cannot be read.

·

The data format is incorrect.

Make sure that the external device is
sending a command listed in
"Communication commands" (page 10).

The sensor amplifiers are being
factory reset (initialized) or in the
start-up process after the power is
turned on.

Resend the command after the factory
reset (initialization) or start-up process is
complete.

29 Communication error

An error was detected with
RS-232C communication.

Make sure that DL-RS1A and the external
device have the same communication
settings configured. For information on
configuring DL-RS1A, refer to "(1)
Communication setup switches" (page 2).

65 ID number error

The ID number specified with the
command is incorrect.

Make sure that the sent data specified as
the ID number is a 2-digit number (ASCII
characters) according to the number of
connected units.

66 Expansion line error

The communication could not be
established due to a problem with
an expansion line.

Check that each of the sensor amplifiers
and DL-RS1A are securely and properly
connected by referring to "Connecting
the Unit to Sensor Amplifiers" (page 3).
Make sure that sensor amplifiers that are
supported by DL-RS1A are connected
(refer to page 4).

67 Write control error DL-RS1A is not in a writable state.

Change the read/write setting switch to
the R/W position to enable writing to DL­RS1A. For information on the read/write
setting switch, refer to "Part Names and
Functions" (page 2).

Point

Communication Response Time

This section describes the communication response time for each communication command and
various time frames.

Communication Response Time and Time Chart

This section describes the concept of communication response time and the time chart for the
communication commands.

When sending communication commands consec utively from the external device, wait to send
the next command after reception of the response for the previous command from DL-RS1A
completes.

■ SR command

The SR command directly reads data from a sensor amplifier during T4 (DL-RS1A command
processing time).

Time chart

■ M0 command and MS command

The M0 and MS commands read the buffered data that DL-RS1A periodically retrieves from the
sensor amplifiers.
Therefore, the latest data detected by the sensors can only be read after T2 (DL-RS1A data
processing time) where DL-RS1A retrieves data from the sensor amplifiers.

Point

External device

DL-RS1A

T5

T3

T4

T3: Command format send time from external device
T4: DL-RS1A command processing time
T5: Response send time from DL-RS1A

* For the specific values (times) of T3 to T5, refer to

"Time Frames of Communication Response Time" (page 14).

Sensor amplifier

DL-RS1A

T1

T2

External device

T3

T5

T4

T1: Sensor amplifier response time (Refer to the instruction manual of the sensor amplifier.)
T2: DL-RS1A data processing time
T3: Command format send time from external device
T4: DL-RS1A command processing time
T5: Response send time from DL-RS1A

Detection

* For the specific values (times) of T2 to T5, refer to

"Time Frames of Communication Response Time" (page 14).

13

Communication Response Time

■ DRQ input

The data read in response to a DRQ input is the buffered data that DL-RS1A periodically retrieves
from the sensor amplifiers.
Therefore, the latest data detected by the sensors can only be read after T2 (DL-RS1A data
processing time) where DL-RS1A retrieves data from the sensor amplifiers.

Time chart

■ SW command and AW command

The SW and AW commands are write commands.

Time chart

When reading the data applied by settings written to the sensor amplifier with the SW
command or AW command, using the commands (M0, MS) or DRQ inputs, perform reading
after the above "T2 (DL-RS1A data processing time)" elapses.

Sensor amplifier

DL-RS1A

T1

T2

DRQ input

T5

T4

Detection

↓

2 ms min.

T1: Sensor amplifier response time (Refer to the instruction manual of the sensor amplifier.)
T2: DL-RS1A data processing time
T4: DL-RS1A command processing time
T5: Response send time from DL-RS1A

* For the specific values (times) of T2 to T5, refer to

"Time Frames of Communication Response Time" (page 14).

External device

DL-RS1A

T5

T3

T4

Sensor amplifier

T6

T3: Command format send time from external device
T4: DL-RS1A command processing time
T5: Response send time from DL-RS1A
T6: Sensor amplifier setting change time

* For the specific values (times) of T3 to T6, refer to

"Time Frames of Communication Response Time" (page 14).

Point

Communication Response Time

Time Frames of Communication Response Time

This section describes the communication time frames (T2 to T6).

The maximum time required is shown for each time frame. However, depending on the
actual environment, it may require more time.

■ T2 (DL-RS1A data processing time)

For information on the calculation function, refer to the manual supplied with the sensor amplifiers.

● When calculation function of sensor amplifiers is OFF

*

* This table also applies to the sensor amplifiers that do not have the calculation function.

● When calculation function of sensor amplifiers is ON

■ T3 (Command send time from external device)

Refer to the manual supplied with the external device connected to DL-RS1A.

Reference

Number of connected

sensor amplifiers

Data processing time (T2)

FD-MH Series

17 ms
29 ms
313 ms
415 ms
519 ms
621 ms
725 ms
827 ms
931 ms

10 33 ms

Number of connected

sensor amplifiers

Data processing time (T2)

FD-MH Series

1 10.5 ms
2 13.5 ms
3 19.5 ms
4 22.5 ms
5 28.5 ms
6 31.5 ms
7 37.5 ms
8 40.5 ms
9 46.5 ms

10 49.5 ms

14

Communication Response Time

■ T4 (DL-RS1A command processing time)

The processing time varies according to the command sent from the external device.

● Read commands

● Write commands

Communication command

Number of connected

sensor amplifiers

Command processing time (T4)

FD-MH Series

SR

114 ms
215 ms
317 ms
418 ms
520 ms
621 ms
723 ms
824 ms
926 ms

10 27 ms

M0/MS/DRQ input

1 to 10

4 ms

Communication command

Number of connected

sensor amplifiers

Command processing time (T4)

FD-MH Series

SW

114 ms
215 ms
317 ms
418 ms
520 ms
621 ms
723 ms
824 ms
926 ms

10 27 ms

AW

1 57.5 ms
2 58.5 ms
3 60.5 ms
4 61.5 ms
5 63.5 ms
6 64.5 ms
7 66.5 ms
8 67.5 ms
9 69.5 ms

10 70.5 ms

Communication Response Time

■ T5 (Response send time from DL-RS1A)

The time required to send a response varies depending on the communication speed, data bit
length, and number of bytes.
For information on the communication settings, refer to page 2.
The response time can be calculated using the following formula:

 T5 = (number of bytes) x (data bit length + 4) / (communication speed)

● Number of bytes for different commands

SR command : (number of bytes in the read data) + 12
M0 command : {(number of bytes in the read data) + 1} u number of connected sensor amplifiers + 4
MS command : {(number of bytes in the read data) + 3} u number of connected sensor amplifiers + 4
DRQ input : {(number of bytes in the read data) + 3} u number of connected sensor amplifiers + 4
SW command : 11
AW command : 8
* For information on the number of bytes in the write data and the number of bytes in the read data,

refer to "Parameters of Commands and Responses" (page 10).

Sample calculation

■ T6 (Sensor amplifier settings change time)

For information on the calculation function, refer to the manual supplied with the sensor amplifiers.

● When calculation function of sensor amplifiers is OFF

*

T6 = 0 ms for SW and AW commands; the sensor amplifiers complete modifying their settings during
the T4 period.
* This table also applies to the sensor amplifiers that do not have the calculation function.

● When calculation function of sensor amplifiers is ON

SW and AW commands both require the processing time shown below.

Number of bytes Data length Communication speed Response time

21 8 bit 9600 bps 26 ms

114 8 bit 9600 bps 143 ms

21 7 bit 38400 bps 6 ms

114 7 bit 38400 bps 33 ms

Number of connected sensor amplifiers Settings change time (T6)

17 ms
29 ms
313 ms
415 ms
519 ms
621 ms
725 ms
827 ms
931 ms

10 33 ms

15

Specifications

Performance Specifications

The following table shows the performance specifications for DL-RS1A.

* The number of connectable sensor amplifiers varies depending on the model to be connected.

• When configured with the FD-MA Series units: Up to 10 units (including the master unit)

Communication Specifications

The following table shows the communication specifications for DL-RS1A.

Item Specifications

Model DL-RS1A

Power supply voltage

20 to 30 VDC, including 10% ripple (P-P). Class2

(Supplied from the connected sensor amplifier)
Current consumption 25 mA max.
Number of connectable
sensor amplifiers

Varies depending on the model*

Indicators

2 communication status indicators (green), alarm indicator (red), power indicator

(green)

Environ­mental

Ambient
temperature

-10 to +55°C (No freezing)

Relative
humidity

35 to 85% RH (No condensation)

Vibration 10 to 55 Hz, compound ampl itude 1.5 mm, 2 hours for each of XYZ axes
Material Main unit housing: polycarbonate
Weight Approx. 53 g

Accessories

Instruction manual, 2 end units, expansion connector cover, switch protection
sticker

Item Specifications

Communication method Full duplex
Synchronization method Asynchronous

Transmission code

ASCII
Communication speed
(Baud rate)

2400, 4800, 9600, 19200, 38400 bit/s

(Factory default: 9600 bit/s)
Data bit length 7 or 8 bits (Factory default: 8 bits)
Parity check None, even, odd (Factory default: none)
Stop bit length 1 bit

Data delimiter

Receive: automatically detect CR or CR + LF

Send: fixed to CR + LF

Specifications

Dimensions

■ When the unit is mounted on the DIN rail

■ When the optional fixture (OP-60412) is used

22.5

(48.2)

43.8

37.2

21.1 35.4

70

Unit：mm

2-(4.4x3.4)

37.2

43.8

51.3

31.4

70

15

15

28.5

35.5

22.5

2-φ3.4

5

Unit：mm

16

Troubleshooting

Problem Cause Action

The power indicator (POWER)
does not light up.

Power is not
supplied.

Make sure that the voltage of the power supplied to the

sensor amplifier main unit is 20 to 30 VDC.
DL-RS1A is not
properly inserted to
the expansion
connector of the
sensor amplifier.

Reconnect the unit following the instructions in "Connecting

the Unit to Sensor Amplifiers" (page 3).

The alarm indicator lights up
before communication starts.

DL-RS1A is
connected to a
sensor amplifier that
does not support DL­RS1A.

Make sure that the unit is connected to an appropriate

sensor amplifier model (refer to "Available sensor amplifiers"

(page 4)).Reconnect the unit following the instructions in

"Connecting the Unit to Sensor Amplifiers" (page 3).

The communication status
indicator (RD) of DL-RS1A does
not flash when you send a
command from an external
device.

The RD terminal of
DL-RS1A is not
connected to the
SD terminal of the
external device.

Check the connection wiring by referring to "Connecting the

Unit to External Devices" (page 5).

No communication
data is sent from the
external device.

Make sure that communication commands are sent out from

the external device.

The alarm indicator lights up
while data is transmitted.

Communication
settings are
incorrect.

Make sure that DL-RS1A and the external device have the

same settings specified for communication speed, data bit

length, and parity check.

For information on configuring DL-RS1A, refer to "Part

Names and Functions" (page 2).

The communication status
indicator (RD) of DL-RS1A
flashes but the communication
status indicator (SD) does not
flash while data is transmitted.
The communication status
indicator (SD) of DL-RS1A
flashes while data is
transmitted, but the data cannot
be retrieved by an external
device.

Proper
communication is
not established.

Lower the communication speed. Use a shielded cable for

the communication cable (refer to "Connecting the Unit to

External Devices" (page 5)). Modify the connection wiring so

that noise does not enter the communication cable.

A communication error
response is returned from DL­RS1A while data is transmitted.

For the cause and action, refer to page 13.

ASCII Code Table

The following table lists the ASCII codes.

0

0

1

2

3

4

5

6

7

8

9

A

B

C

D

E

F

123456789

S

P

N

U

L

D

L

E

D

C

1

D

C

2

D

C

3

D

C

4

N

A

K

S

Y

N

E

T

B

C

A

N

S

U

B

E

S

C

S

O

H

S

T

X

E

T

X

E

O

T

E

N

Q

A

C

K

B

E

L

B

S

EMH

T

L

F

V

T

F

F

C

R

S

O

D

E

L

S

I

0 ＠ P ｀ p

High-order 4 bits

！ 1AQaq
 2BRbr
＃ 3CSc s
＄ 4DTd t
％ 5EUeu
＆ 6FV f v
 7

Low-order 4 bits

GWg w

（ 8HXh x
） 9IYiy

： JZj z
＋； K ［ k ｛
，＜ L\ l｜
ー＝M ］ m ｝
．＞ N ＾ n

~

／

→
←
↑
↓ ?O＿ o

17

Revision History

Date of printing Version Revision contents

February 2010

February 2011

Released for each model. First edition

First revision

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E 1110-2

A5WW1-MAN-1090

Copyright (c) 2011 KEYENCE CORPORATION. All rights reserved.
195013E 1021-1 96143E Printed in Japan

Specifications are subject to change without notice.

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