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Unit description
3.6
Serial Interfaces RS 232, RS 485
3.6.1
RS 232 Interface
Data
R x D
T x D
DTR
Signal
Ground
DSR
RTS
CTS
with Hardware Handshake: When connecting the thermostat to the computer please use a 1:1 cable
and not a zero-modem-cable!
without Hardware Handshake: The computer needs an operating mode: "without hardware
handshake". In the plug of the thermostat a bridge has to be inserted between Pin 7 and 8.
The RS 232 Interface can easily be tested with the PC connected, using the MS-Windows operating
system.
On Windows 3.11 with the programme "Terminal" and on Windows
programme "Hyper Terminal".
6
Computer
9-pin sub-D
25-pin sub-D
socket
2
2
3
3
3
2
4
20
5
5
7
6
6
7
4
8
5
− Use screened connecting cables.
− Connect the screen to the plug case.
− The lines are electrically isolated from the remaining electronics.
− Unoccupied pins must not be connected!
9-pin sub-D socket
socket
3
2
2
3
4
7
5
6
7
8
Thermostat
2
3
5
7
8
®
95/ 98/ NT/ XP with the
Data
T x D
R x D
DSR
Signal
Ground
DTR
CTS
RTS
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