Lauda E 4 G - G.3.4 RS 485 Protocol

ECO GOLD
25/08/2011/ YACE0088 Appendix with settings 107
G.3.4 RS 485 protocol
Note the following aspects:
− The interface operates with one stop bit, no parity bit and with eight data bits.
− Transfer speed alternatively: 2400, 4800, 9600 (factor setting) or 19200 baud.
− The device address always precedes the RS 485 commands. Up to 127 addresses are possi-
ble. The address must always consist of three figures
(A000_... to A127_...).
− The command from the computer must be terminated with a CR.
− The response from the thermostat is always terminated with a CR.
CR = Carriage Return (Hex: 0D)
Example:
Set-value transfer of 30.5 °C to the thermostat with address 15.
Computer Thermostat
„A015_OUT_SP_00_30.5“CR
Ö
Õ
„A015_OK“CR