Integral T process thermostats
78
Starting up
YAWE 0026 / 21/01/2019
An RS 485 bus always requires bus termination in the form of a termination network which
ensures a defined rest status in the high-resistance phases of bus operation. The bus termination
is as follows:
This termination network is usually incorporated on the PC plug-in card (RS 485).
Protocol:
The interface operates with 1 stop bit, no parity bit and 8 data bits.
Transfer rate either 2400, 4800, 9600 (Factory setting) or 19200 baud as
selected.
The RS 485 commands are always preceded by the device address. There is
provision for 127 addresses. The address must always have 3 digits.
(A000_...to A127_...).
The command from the computer must be terminated with CR.
The response of the thermostat is always terminated with CR.
CR = Carriage Return (Hex: 0D).
Example:
Transfer of setpoint 30.5 °C to the thermostat with address 15.
Computer
Thermostat
„A015_OUT_SP_00_30.5“CR
„A015_OK“CR
