4.3.3 Connecting cable RS 485
Thermostat with 9-pin sub-D socket
Contact Data
1 Data A (-)
5 SG (Signal Ground) optional
6 Data B (+)
Note the following instructions:
Use protected connection lines.
Connect the protective screen with the connector shell.
The lines are galvanically separated from the rest of the electronics.
Do not connect unassigned pins.
An RS 485 bus always requires a bus connection in the form of a termina-
tion network that guarantees a defined standby state in the high-ohm phases
of bus operation. The bus connection looks like this:
This termination network is usually integrated in the insertable PC card
(RS 485) and activated via jumpers.
4.3.4 Protocol RS 485
Note the following instructions:
The interface works with 1 stop bit, without a parity bit and with 8 data
bits.
Transmission speed alternately: 2400, 4800, 9600 (factory setting) or
19200 baud.
The device address always precedes the RS 485 commands. Up to
127 addresses are possible. The address must always consist of three
digits (A000_... to A127_...).
The command from the computer must be made with a CR.
The response from the thermostatic circulator is always made with a CR.
CR = Carriage Return (Hex: 0D)
Example with set point transfer of 30.5 °C to the thermostatic circulator. In
this example, the address 15 is used.
Computer Thermostatic circulator
“A015_OUT_SP_00_30.5” CR
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ç
“A015_OK” CR
Connection RS 485
Termination
Fig. 13: RS 485 termination
V6 PRO bath thermostats and circulation thermostats 35 / 156
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