AC38B OPTO 22, AC38B Datasheet - Page 11

• Manufacturer Part Number: AC38B
• Description: Computers, Interface Cards
• Manufacturer: OPTO 22

Specifications of AC38B

• Peak Reflow Compatible (260 C): No
• Leaded Process Compatible: No
• Features: High-Speed RS485 Repeater, 220VAC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

DATA SHEET
Form 519-100915
RS-485 SERIAL LINE TERMINATION AND BIASING
Two groups of jumpers are provided which are used to connect terminating and biasing resistors. The group labeled H0 - H8 is used to configure
the host RS-485 port while the group labeled R0 - R5 is used to configure the remote RS-485 port. The function of each jumper is as follows:
Jumper H0: Pull-up for host IRQ + line.
Jumper H1: Terminator for host IRQ lines.
Jumper H2: Pull-down for host IRQ - line.
Jumper H3: Pull-up for host TX/RX + line.
Jumper H4: Terminator for host TX/RX lines
Jumper H5: Pull-down for host TX/RX - line.
Jumper H6: Pull-up for host RX + line.
Jumper H7: Terminator for host RX lines.
Jumper H8: Pull-down for host RX - line.
RS-485 communication links must be terminated at both ends and biased at only one place. When using a G4LC32 RS-485 serial port, biasing
is done automatically when terminators are installed.
When using the AC38 as a simple, 2-wire repeater located at the end of both RS-485 links, jumpers H0, H1, H2, H4, H6, H7, H8, and all remote
port jumpers, R0 - R5, should be installed. If biasing is needed on the host link, jumpers H3 and H5 should be installed.
When using the AC38 as an RS-232 to RS-485 converter, all host and remote port jumpers should be installed.
When the AC38 is used anywhere except the end of a link, the appropriate jumpers should be removed to disconnect terminating and biasing
resistors.
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: [phone] • (800) 321-OPTO • Fax: [phone] • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800)TEK-OPTO • [phone] • Fax: [phone] • E-mail: [e-mail]
ADAPTER CARDS
Jumper R4: Terminator for remote TX/RX lines.
Jumper R5: Pull-down for remote TX/RX - line.
Jumper R1: Terminator for remote IRQ lines.
Jumper R3: Pull-up for remote TX/RX + line.
Jumper R2: Pull-down for remote IRQ - line.
Jumper R0: Pull-up for remote IRQ + line.
TRADITIONAL
STANDALONE
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