AC7 OPTO 22, AC7 Datasheet - Page 14

• 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

INSTALLATION
CONNECTING THE AC7A/B TO THE OPTOMUX NETWORK
14 AC7A/B User’s Guide
Standard Configuration
For this connection, Opto 22 recommends that you use three pairs of shielded, twisted wire. This comes to a total
of 6 wires in addition to the shield drain wire. All conductors should be stranded #22 or #24 gauge, with a nominal
impedance of 100 ohms and a capacitance of 12.5 pF/ft.
The first pair of twisted wire connects the TO+ and TO- terminals on the AC7A/B to the FH+ and FH- terminals on
the Optomux device (TO+ to FH+ and TO- to FH-). The second pair of twisted wire connects the FO+ and FO- terminals
on the AC7A/B to the TH+ and TH- terminals on the Optomux equipment. The third pair of twisted wire connects
the LOGIC GND terminal on the AC7A/B to the COM terminal of the Optomux device. Finally, the shield of the three
pairs of twisted wire should be tied to earth ground at only one of its two ends.
For details on connecting multiple Optomux brain boards to the RS-422/485 communication cable, please see the
Optomux B1 and B2 data sheet (form 463).
Alternate Configuration
A slightly less noise-immune connection may be made with a two twisted-pair shielded cable. Instead, use the
shield drain wire of the cable to connect logic ground/common between the two devices. In this case, DO NOT
connect the shield to earth ground.
Figure 2-13: Alternate RS-422/485 Wiring from AC7A/B to Optomux Brain Board
Figure 2-12: Standard RS-422/485 Wiring from AC7A/B to Optomux Brain Board