Integral XT
110
Starting up
YAWE0028 / 24/06/2016
7.17 RS232/RS485 interface (only Command remote control or Module)
7.17.1 Connecting cables and interface test RS232
Computer
Thermostat
Signal
9-pin sub-D-socket
25-pin sub-D-socket
9-pin sub-D-socket
Signal
¬
-
¬
-
¬
-
R x D
2
2
3
3
2
2
T x D
T x D
3
3
2
2
3
3
R x D
DTR
4
20
4
DSR
Signal Ground
5
5
7
7
5
5
Signal Ground
DSR
6
6
6
DTR
RTS
7
4
7
CTS
CTS
8
5
8
RTS
¬
with hardware handshake: For connecting a thermostat to the PC use 1:1 cable and not a null-
modem cable!
-
without hardware handshake: the computer / PC must be set to the operating mode “without hard
ware handshake”.
+
−
Use screened connecting cable.
−
Connect screen to connector case.
−
The connections are isolated from the remainder of the electronics.
−
Any pins not in use must not be connected!!
When a PC is connected up the RS232 interface can easily be
tested
using the Microsoft Windows
operating system. On Windows
®
95/ 98/ NT/ XP with the „Hyper Terminal” program.
“HyperTerminal” is no longer part of the operating system in Windows Vista, Windows 7 and Win-
dows 8.
−
With the LAUDA software “Wintherm Plus” (catalogue number LDSM2002) the RS232 inter-
face can be addressed.
−
In the Internet there are terminal programs available as freeware. These programs offer similar
functions as “HyperTerminal” (for example PuTTY). Search for “serial port terminal program”.
7.17.2 Protocol RS232
+
−
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 select-
ed.
−
The RS232 interface can be operated with or without hardware handshake,
(RTS/CTS).
−
The command from the computer must be terminated with CR, CRLF, or LFCR.
−
The response of the thermostat is always terminated with CRLF.
CR = Carriage Return (Hex: 0D)
LF = Line Feed (Hex: 0A)
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