Omron SYSMAC CJ1W-SCU21-V1 User Manual (English)

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Comparison to Previous Products Section 1-7

Reception buffer clearing

timing

Half-duplex Before executing sequences.

Before executing RECV

processing.

Before executing sequences.

After executing SEND

processing.

Upon FLUSH command

execution.

Full-duplex None Before executing sequences.

Upon FLUSH command

execution.

(Unit Ver. 1.2 or later: Either

clear or hold before executing

sequences.)

Reception buffer recep-

tion processing

Half-duplex Only during RECV processing. Except when executing SEND

processing.

Full-duplex None During sequence execution

(reception processing not

performed except during

sequence execution).

Character trace reception

records

Half-duplex Recorded except during SEND

processing.

During sequence execution

(even during SEND processing)

Full-duplex None

Transmission control

signal operations

RTS signal RTS/CTS flow control: RTS sig-

nal turned ON when reception

buffer reaches 200 bytes.

Modem control: RTS signal

turned ON when data is sent

and turned OFF when send is

completed.

RTS/CTS flow control: RTS sig-

nal turned ON when reception

buffer reaches approximately

2Kbytes.

Modem control: RTS signal

turned ON when data is sent

and turned OFF when send is

completed.

CTS signal RTS/CTS flow control: Data

send is on standby when CTS

signal turns ON; data can be

sent when CTS signal turns

OFF.

RTS/CTS flow control: Data

send is on standby when CTS

signal turns ON; data can be

sent when CTS signal turns

OFF.

ER signal Modem control: ON when

sequence execution is started,

OFF when completed.

Turns ON only for modem con-

trols.

Modem control: ON when

sequence execution is started,

OFF when completed. Also can

be turned ON or OFF as

required during modem control

by executing OPEN to turn ON

the ER signal or by executing

CLOSE to turn OFF the ER sig-

nal in sequence steps. The ER

signal can also be controlled

across multiple steps.

During RTS/CTS flow control and modem control, the ER signal

will be controlled according to modem control operations, the RTS

signal will turn ON when sending, and the RTS/CTS flow control

operations will be used for the RTS and CTS signals for

receptions.

Synchronization with CPU Unit after start of sequence

execution

None The WAIT command can be

used to stop transitions between

steps to allow transitions from

the CPU Unit.

This is useful, for example, to

perform processing in the CPU

Unit after a specific step but

before executing the next step.

Item C200HX/HG/HE CS/CJ

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Omron SYSMAC CJ1W-SCU21-V1 Specifications

General

Model	CJ1W-SCU21-V1
Type	Serial Communications Unit
Number of Ports	1
Parity Check	None, Even, Odd
Manufacturer	Omron
Operating Temperature	0 to 55 °C
Storage Temperature	-25 to 65 °C
Data Bits	7, 8
Stop Bits	1 or 2 bits
Flow Control	RTS/CTS
Isolation	Photocoupler isolation
Applicable PLC	CJ1 Series
Power Supply	5 VDC (supplied from the PLC backplane)
Compatible PLC Series	CJ1 Series
Protocol Support	NT Link, Host Link, No-protocol Mode
Baud Rate	300 to 115200 bps