61
W&T
Serial PCI cards
Subject to error and alteration
PCI card 2x 20mA, #13411
Function
The W&T PC card model 13411 provides on port 1 and port 2
two independent serial 20mA interfaces with galvanic isolation
of 1kV DC. Ports 3 and 4 can be used also for any two non-
galvanically isolated serial interfaces.
Wiring configuration
The 20mA connections on the PC card are implemented as DB9
plugs. The connector pin assignments are shown in the follo-
wing table:
Applications
A ground level on Pin 5 of the SUB-D connector places the
20mA interface in half-duplex mode in which there is echo sup-
pression of the sent signals.
The PC card can be used as either an active or passive 20mA
component. In active mode the card provides the loop current
for the respective 20mA loop, whereas in passive mode the
connected device itself must provide the loop current.
pin#
function
1
Data Out 20 mA
2
Data Out +
3
Data Out -
4
Data Out GND
5
Halfduplex control
6
Data In 20 mA
7
Data In +
8
Data In -
9
Data In GND
Содержание 13011
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