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Troubleshooting, Ascii code table – KEYENCE DL-RS1A User Manual

Page 21

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19

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 DL-

RS1A.

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 DL-

RS1A while data is transmitted.

For cause and action, refer to page 14.

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

1

2

3

4

5

6

7

8

9

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

E

M

H

T

L

F

V

T

F

F

C

R

S

O

D

E

L

S

I

0

P

p

High-order 4 bits

1

A Q

a

q

2

B

R

b

r

3

C

S

c

s

4

D

T

d

t

5

E

U

e

u

6

F

V

f

v

7

Low-order 4 bits

G W g

w

8

H

X

h

x

9

I

Y

i

y

J

Z

j

z

K

k

L

\

l

M

m

N

n

~

?

O

o