Connect Tech NT960/PCI - Manual (Page 38)

2-8 Chapter 2: Hardware Installation
Intellicon-NT960/PCI User's Manual, ver. 0.02
SLIM Options
The ACM/Flex16 has four SLIM sockets to accept Connect
Tech's RS-232 and/or RS-485/422 and/or 20mA Current Loop
Serial Line Interface Modules (SLIM). If you order RS-232
modules please refer to Appendix C: RS-232 Option for more
technical information. If you order RS-485/422 modules please
refer to Appendix D: RS-485/422 Option for more technical
information. If you order 20mA Current Loop modules please
refer to Appendix E: 20mA Current Loop Option for more
technical information.
LED interface indicators (ACM/Flex16)
You can install RS-232 and/or RS-485/422 and/or 20mA Current
Loop Serial Line Interface Modules in your ACM/Flex 16. The
ACM/Flex16 has LED indicators on its front panel to show you
the electrical interface in use for a specific group of four ports.
When the LED is red the RS-485/422 interface is in use; when it
is green the RS-232 interface is in use; and when it is amber the
20mA Current Loop interface is in use. Please refer to Figure 10
for the location of these LED interface indicators.