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The following operations can be carried out from an external computer.
(1) Reading and setting of the SV, PID values and various set values
(2) Reading of the PV and action status
(3) Function change
Cable length: Max 1.2km, Cable resistance: Within 50
(Terminators are
not necessary, but if used, use 120
max. on both sides.)
Communication line: EIA RS-485
Communication method: Half-duplex communication
Synchronization method: Start-stop synchronization
Communication speed: 9600/19200/38400 bps (Selectable by keypad)
Data bit/Parity: 7 bits, 8 bits/Even, Odd, No parity (Selectable by keypad)
Stop bit: 1 bit, 2 bits (Selectable by keypad)
Communication protocol: MEWTOCOL/MODBUS ASCII/MODBUS RTU
(Selectable by keypad)
Data format:
Communication
protocol
MEWTOCOL
MODBUS ASCII
MODBUS RTU
Start bit
1
1
1
Data bit
7
7 or 8
8
Parity
Yes (Even)
Yes (Even, Odd),
No parity
Yes (Even, Odd),
No parity
Stop bit
1
1 or 2
1 or 2
Serial communication
Number of connectable units: Maximum 31 units to 1 host computer
Communication error detection: Parity, LRC (Modbus ASCII),
CRC-16 (Modbus RTU)
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: [email protected]