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6802_10_12_04_Handbuch_GB
11.6 Error Recognition
To control whether the signals transmitted to the
TWIN-CENTER are correctly understood, the
TWIN-CENTER continually sends incoming sig-
nals from the receiving connections back to the
computer over the transmission connections.
This traffic is so-called "echo operation". If the
returned signals appear on the computer screen,
then the operator knows that the TWIN-CENTER
has understood the instructions.
If no signal is sent back from the TWIN-CENTER,
then is shows that there is either no connection
between them, or the TWIN-CENTER is not ready
to receive. The echo operation means that some
computers can also be used with the TWIN-CEN-
TER even if the hardware protocol will not func-
tion via the four command cables.
If false commands are received from the compu-
ter, the TWIN-CENTER can react with three diffe-
rent error indicators:
X = channel error
The TWIN-CENTER comes up with "X" when one
tries to speak to a prohibited address.
Y = Function error
If the function to be carried out is wrong, then "Y"
will be shown. False function can be for example:
• setting the speed level "16" (there are
only 15 speed levels from "0" to "15")
• Inertia level "9" (there are only inertia
levels "1" to "8")
Z = Sequence error
Error indicator of a point route 1 - 48, which is not
programmed in the TWIN-CENTER.
In operation, commands can equally be given via
the computer as from the TWIN-CENTER.
11.7 Computer-Cable
As already mentioned, the TWIN-CENTER is
connected into the computer by using a standard
9-pole modem cable which is wired one to one
from the nine pole plug to the nine pole socket.
Just in case this is not successful, here is the
information:
01.03.2007
13:58 Uhr
Seite 135
11 The Computer-Interface
The computer connector socket 6 of the TWIN-
CENTER is connected as follows:
5
GND
9
not used
4
DTR
8
CTS
3
TX (Data to Computer)
7
not used
2
DTRRX (Data from Computer)
6
DSR
1
CD
Leads 2, 3, 5 and 8 run to the computer.
Leads 1, 4, and 6 are joined together with each
other in the TWIN-CENTER.
In a connection with a 9-pole socket, normally all
connection poles are wired one to one with each
other. If only the four connections 2, 3, 5 and 8
are connected with each other, then the connec-
tions 1, 4 and 6 on the computer side must be
connected together.
5
5
9
4
4
8
TC
3
3
7
2
2
6
1
1
For connection to a 25-pole socket, which is still
possible on old computers, please use an availa-
ble adapter on the computer end of the cable.
Here the connections 2, 3, 5 and 8 of the TWIN-
CENTER must be connected with the connec-
tions 3, 2, 5 and 7 of the 25 pole plug.
In addition to this, the connections 6, 8 and 20 of
the computer must be wired together.
13
12
11
10
9
8
5
7
9
4
6
8
3
5
7
2
4
6
1
3
2
1
9
8
PC
7
6
25
24
23
22
21
20
19
18
17
16
15
14
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