RTC
®
4 PC Interface Board
Rev. 1.3 e
6 Electrical Connections
55
innovators for industry
6.5 Data Cable
To connect the scan head to the RTC
®
4, a data cable
is required. This cable is not included in the package.
SCANLAB recommends the following design:
The data cable must have identical 25-pin (male)
D-SUB connectors at both ends. The cable
consists of six twisted cable pairs for the
following six channels: SYNC±, CHAN1±,
CHAN2±, CHAN3±, STATUS± and CLOCK±. The
channel CHAN3± is provided for optionally
controlling a third axis.
The data cable must have coaxial copper braided
shielding.
The data cable should not be longer than 10 m.
If a longer data cable is needed, the signal timing
should be adjusted to ensure correct communi-
cation between the scan head and the RTC
®
4. See
the command
details. The cable length must not exceed 20 m.
The D-SUB connectors must have fully shielded
metal housings.
The electrical connection of the cable’s braided
shielding to the D-SUB housing should
not
be
implemented as a wire. Instead, the cable’s
braided shielding should be
coaxially
connected
to the D-SUB housing via shielded clamps.
The data cable’s controller end must be fitted
with a ferrit ring (e.g. Würth WE 742 711 32).
shows the data cable layout and pin
assignments.
Some scan heads use a single connector to provide
both the power supply voltages and the data signals.
For these scan heads, SCANLAB recommends imple-
menting a cabling solution that allows the use of
separate cables for data and power. The data-section
of such a cabling solution should be designed to
accommodate the data cable shown in
27
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
1
14
2
15
3
16
4
17
5
18
6
19
7
20
8
21
9
22
10
23
11
24
12
25
13
CLOCK –
CLOCK+
SYNC –
SYNC+
CHAN1 –
CHAN1+
CHAN2 –
CHAN2+
CHAN3 –
CHAN3+
STATUS –
CLOCK –
CLOCK+
SYNC –
SYNC+
CHAN1 –
CHAN1+
CHAN2 –
CHAN2+
CHAN3 –
CHAN3+
STATUS –
SUB-D
25 pin male
SUB-D
25 pin male
Shielding
Data cable layout and pin assignments