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4-22 Chapter 4: Appendix E - 20mA Current Loop Option
Intellicon-NT960/PCI User's Manual, ver. 0.02
Appendix E: 20mA Current Loop Option
You may order the ACM/Flex16 with 20mA Current Loop Serial
Line Interface Modules. ). The 20mA Current Loop SLIM offers
the following features:
ƒ
A passive 20mA Current Loop electrical interface.
ƒ
The 20mA Current Loop receivers and transmitters are
optically isolated.
ƒ
Each SLIM controls four ports.
ƒ
LEDs on the ACM/Flex16 indicate the electrical interface in
use for a specific group of four ports.
ƒ
SLIMs are field upgradeable, providing you with more
flexibility for your application.
Please refer to Figure 21 for a partial schematic of the 20mA
Current Loop SLIM.
Figure 21: 20mA Current Loop partial schematic
7
2
1
TxD +
TxD -
4
3
20mA Current Loop SLIM: partial schematic
HPCL
4100
5
8
+5V
TxD 6
+5V
+5V
RxD
HPCL
4200
6 5
8
RxD +
RxD -
CTS
DCD
Note: The 20mA Current Loop Serial Line Interface Module
controls four ports, and therefore the schematic shows only a
portion of the circuit.