G.3.2 Rs 232 Protocol; G.3.3 Rs 485 Connecting Lead - Lauda E 4 G Operating Instructions Manual

Alternatives for Windows Vista and Windows 7:
−
Download various freeware programs from the Internet.
−
Copy program "Hyper Terminal" from an old operating system.
To do this copy hypertrm.exe from C:\Programs\Windows NT and both of the DLL files hypertrm.dll and
hticons.dll from C:\WINDOWS\system32. All this can be packed into any directory and used as a port-able
application. Now access can be obtained to the RS 232 interface.

G.3.2 RS 232 protocol

Note the following aspects:
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The interface operates with one stop bit, no parity bit and with eight data bits.
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Transfer speed alternatively: 2400, 4800, 9600 (factor setting) or 19200 baud.
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The RS 232 interface can be operated with or without hardware-handshake (RTS/CTS).
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The command from the computer must be terminated with a CR, CRLF or LFCR.
−
The response from the thermostat is always terminated with a CRLF.
CR = Carriage Return (Hex: 0D); LF = Line Feed (Hex: 0A)
Example:

G.3.3 RS 485 connecting lead

−
Use screened connecting leads. Connect screen to the plug housing.
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The wires are electrically isolated from the rest of the electronics.
−
Non-assigned pins should not be connected.
An RS 485 bus requires essentially a bus termination in the form of a terminating network, which pro-
vides a defined idle state in the high impedance phases of bus operation. The bus termination is as fol-
lows:
Generally, this terminating network is integrated on the PC plug-in card (RS 485).
106
Set-value transfer of 30.5 °C to the thermostat
Computer
„OUT_SP_00_30.5"CRLF
Thermostat
9-pole Sub-D socket
Contact
1
5
6
Appendix with settings
Thermostat
„OK"CRLF
Data
Data A (-)
SG (Signal Ground)
optional
Data B (+)
ECO GOLD
25/08/2011/ YACE0088