
Network Cable Communications
A-2
SIMATIC TI505/TI500 MODNIM User Manual
A.1 Network Cables
The
following cables are available through your Siemens distributor
.
Cable P/N Description Adapter at Module
2601094–8001 Standard
9-pin null modem
9-pin (F) to 25-pin (M) port adapter
VPU200–3605
Standard 25-pin null modem
None required
If
you prefer to build your own 25-pin cable, ensure that the following
requirements are met to minimize the possibility of noise interference.
•
Cable conductors — 26 AWG, tinned and stranded copper wire, with
one uninsulated 26 A
WG tinned copper drain wire
•
Cable shield — AL foil or aluminum-polyester foil and a 65% minimum
tinned copper braid shield
•
Outer jacket — polyvinyl chloride (PVC) or equivalent material, with a
UL rating of 30V
, 60
°
C minimum
•
Connectors — 25-pin male D-connector
, with contact pins of copper
alloy with gold flashing over nickel plate
Figure
A-1, Figure
A-2, and Figure
A-3 show the cable connections which
can be used for both ASCII and RTU modes of transmission.
1
2
3
4
5
6
20
8
7
1
2
3
4
5
6
20
8
7
(DTE) (DTE)
Shield
99
10 10
11 11
12 12
13 13
Host Series
505 or 500 MODNIM
14
14
TD TD
RD RD
RTS RTS
CTS CTS
GND
DSR
DCD
DSR
DCD
25
25
DTR DTR
Figur
e A-1
MODNIM
to Host (without Handshaking)
Recommended
Communication
Cables
Building Cables
Cable Pinouts
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