Proline Kryomats
YAUE0007 / 2/26/2009
Starting up
85
Example:
Transfer of setpoint 30,5 °C to the thermostat
Computer
Thermostat
“OUT_SP_00_30.5“CRLF
Ö
Õ
“OK“CRLF
7.13.3 Connecting cable RS 485
Thermostat
9-pin sub-D-socket
Pin Data
1
Data A (-)
5
SG (Signal Ground)
optional
6
Data B (+)
)
−
Use screened connecting cables.
−
Connect screen to connector case.
−
The connections are galvanically isolated from the rest of the electronics.
−
Any pins not in use must not be connected!
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).
7.13.4 Protocol RS 485
)
−
The interface operates with one 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 three 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)
