㵪
90
㵪
8
㧚
COMMUNICATIONS
8.1 General Description
8.1.1 General Description of Functions
This Recorder has the following communication functions
㽲
Outputting the Process variable
Process variable, alarms status, etc.
㽳
Outputting the setting value
Reading the setup data such as a range, chart feed speed, etc.
㽴
Inputting the setting value
Writing the setup data such as a range, chart feed speed, etc.
㽵
Controlling of the recorder (Partially)
Selection to print, recording start/stop and changing display etc.
For the functions
㽳
to
㽵
, see the separate volume Communication Command Reference Manual
(sold separately). Setting the engineering mode is not possible as for communication.
8.1.2 Transmission Specifications
(1)
㩷
Communication system
䋺
Start-stop synchronous, half-duplex communications
(2)
㩷
Connection
䋺
One-to-one(RS-232C), One-to-N(RS-485); N = 1 to 32
(3)
㩷
Communication speed
䋺
1200, 2400, 4800, or 9600 bps
(4)
㩷
Start bit
䋺
1 bit
(5)
㩷
Stop bit
䋺
1 or 2 bits
(6)
㩷
Parity
䋺
Even, Odd, or None
(7)
㩷
Data length
䋺
7 or 8 bits
8.1.3 Data structure
(1)
㩷
Character structure
In order to send 1 data (byte) in start-stop synchronous communication, character structure is as
follows:
Start Bit (1) + Data Bit (7 or 8) + Parity Bit (1) + Stop Bit (1 or 2)
(2)
㩷
Data format
The communication data is sent with data terminators added to multiple characters. On receiving
these terminators, the recorder starts analyzing the communication data.
㩷 㩷 㩷 㩷
㩷 㩷 㩷 㩷
1 Character
䌁㩷 㩷 䌂㩷 㩷
C
㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷
CR
㩷
LF
㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷 㩷
Terminator
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Tel: (01943) 602001 Fax: (01943) 816796