AC7 OPTO 22, AC7 Datasheet - Page 28

• 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

ADDITIONAL TECHNICAL INFORMATION
TWO-WIRE RS-485 MODE
28 AC7A/B User’s Guide
A few minor modifications must be made if you are using the AC7A/B in 2-wire mode.
First, you will probably have to make your own custom RS-232 cable from the AC7A/B to the PC. This is to ensure
that DTR (pin 20) on the AC7A/B’s RS-232 connector is not connected. If you are using a 25-pin port on the PC,
then you’ll need to make these three connections:
If you are using a 9-pin serial port on the PC, then you will need to wire these connections:
Figure 4-1: 25-Pin RS-232 Cable for AC7A/B RS-485 2-Wire Mode
Figure 4-2: 9-Pin RS-232 Cable for AC7A/B RS-485 2-Wire Mode