AC7 OPTO 22, AC7 Datasheet - Page 11

• Manufacturer Part Number: AC7
• Description: Computers, Interface Cards
• Manufacturer: OPTO 22

Specifications of AC7

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Features: RS232 To RS422 Converter
• Interface: RS-422⁄485
• Module Type: Adapter Card
• Mounting Type: Protective Enclosure
• Voltage, Supply: 115 VAC ± 10 VAC @ 50⁄60 Hz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

To determine whether you have a null-modem or standard cable, perform the following tests:
If you have a cable with 25-pin connectors at both ends, then test the cable for electrical continuity
between pin 2 on one end of the cable and pin 2 on the other end. These two pins are tied together on a standard
25-pin to 25-pin straight-through cable. In a 25-pin to 25-pin null-modem cable, pin 2 of one end is tied to pin 3 of
the other end.
If you have a cable with a 25-pin connector at one end, and a 9-pin on the other end, then test the cable
for electrical continuity between pin 2 on one end of the cable and pin 3 on the other end. These two pins are tied
together on a standard 25-pin to 9-pin straight-through cable. In a 25-pin to 9-pin null-modem cable, pin 2 of one end
is tied to pin 2 of the other end.
Figure 2-7: 25-Pin to 25-Pin Null Modem Cable Diagram
Figure 2-8: 9-Pin to 25-Pin Null Modem Cable Diagram
AC7A/B User’s Guide 11
INSTALLATION