Omron CJ1W-SCU22, Руководство по эксплуатации, Страница: 49 / 478

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1 Introduction
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
1-4 Features
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1
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rotocols
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Switch 1:N Communications or the Data Write Destinations Using Repeat
Processing
You can specify repeat processing (repeat counters) for send/receive processing in communications
sequences. This enables the same data to be sent by switching destination addresses during 1:N
communications (N = 32 max. due to restrictions in the physical layer) or to switch the PLC memory
used for CJ-series Units write destination addresses during data reception.
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Next Process Switching According to Receive Data
The contents of up to 15 sets of expected receive data can be compared with the actual receive data
to determine the next process.
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Step Wait for Sync Signal from the PLC
At any step of the communications sequence, the next process can be made to wait until a sync sig-
nal from the PLC (CPU Unit) is input. This enables processing, such as data manipulations, to be
performed in the CPU Unit during the communications sequence.
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Half-duplex or Full-duplex Transmissions
The full-duplex transmissions enable all the data received in a sequence to be accessed. Data can
also be received from a remote device while sending.
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 con-
nections.
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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.
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Control ER Signal at Any Time
With a connection to a modem, the ER signal is used to show the communications enabled status of
a Serial Communications Unit (Data Terminal Equipment (DTE)).
Improving this function has enabled the ER signal to be turned ON or OFF at any time during a com-
munications sequence. This enables modem connections 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 communi-
cations mode.