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

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Fe at ur es Section 1-4

immediately after the send operation is completed. Therefore, if there was a

rapid response from the remote device, for example, the data received

between data sending and the completion of the send operation could not be

accessed as receive data by the next receive operation.

Support for the full-duplex transmissions enables all the data received in a

sequence to be accessed. Data can also be received from a remote device

while sending.

Note Full-duplex transmissions can be used with either RS-232C or RS-422A/485

as long as 1:1, 4-wire connections are used. Full-duplex transmissions cannot

be used with 1:N connections or 2-wire connections.

Clear Reception Buffer at

Any Time

With full-duplex mode, the reception buffer is cleared only immediately before

a communications sequence is executed. When a reception or other fault

occurs, the receive data can be cleared at any time using the reception buffer

clear (FLUSH) command.

Control ER Signal at Any

Time

With a connection to a modem, the ER signal is used to show the communica-

tions enabled status of a Serial Communications Board or Unit (Data Terminal

Equipment (DTE)). In conventional operations, the ER signal could be turned

ON only while a communications sequence was being executed.

Improving this function has enabled the ER signal to be turned ON or OFF at

any time during a communications sequence. This enables modem connec-

tions and disconnections to be performed by a protocol macro.

The ER signal can also be kept ON, even after a communications sequence

has been completed. In this case, the ER signal remains ON, even after it has

been switched to a different serial communications mode (for example, Host

Link). This function enables remote programming and monitoring to be per-

formed using remote Programming Devices, by switching to the Host Link

mode with the STUP(237) instruction once the connection has been made

with the modem.

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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