INTERFACES
TRADITIONAL
PC ADAPTER CARD
Form 468-010131
DATA
SHEET
page 4/6
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • Phone: (951) 695-3000 • (800) 321-OPTO • Fax: (951) 695-3095 • www.opto22.com
Inside Sales: (800) 321-OPTO • Product Support: (800) TEK-OPTO • (951) 695-3080 • Fax: (951) 695-3017 • E-mail: [email protected]
Communication Jumpers
Installing jumpers B2 and B4 connects 220 ohm terminating resistors from positive (+) to negative (-) on the transmitter (to
OPTOMUX) and receiver (from OPTOMUX), respectively. In a normal OPTOMUX network these jumpers should both be installed.
Installing Jumpers C2 and C4 connects 220 Ohm terminating resistors for positive (+) to negative (-) on the RTS and CTS,
respectively. In a normal network these jumpers should both be installed.
NOTE: If multiple host computers are used, Jumpers B2, B4, C2, and C4 should only be installed on the adapter card which is physically at the end of the serial
network cable.
Jumper B7 controls the enabling of the RS-422/485 driver. With the jumper removed, the driver is always enabled. With the
jumper installed, the enabling is under the control of the RTS output on the UART. When the RTS is active, the driver will be
enabled. When RTS is inactive, the driver is disabled.
If Jumper B7 is installed, jumpers B1 and B3 must also be installed. These jumpers passively pull the transmit lines (to
OPTOMUX) to the inactive state.
If the adapter card is operating with a multidrop OPTOMUX network, jumpers B5 and B6 must be installed. These jumpers
passively pull the receive (from OPTOMUX) to the inactive state. Also, C5 and C6 must be installed to passively pull the CTS to the
inactive state.
Jumper C7 controls the enabling of the RS-422/485 driver. With the jumper installed, the enabling is under the control of the
CTS input from the RS-422/485 connection. Jumpers B7 and C7 should never be installed at the same time.
Never install jumper B8 on the AC422AT model.
The CTS jumper should always be installed on the adapter card when the RTS/CTS handshake lines are NOT being used.
With earlier revision adapter cards which do not have a CTS jumper, the RTS outputs must be looped back to the CTS inputs. This
is done by connecting the RTS positive (+) pin to the CTS positive (+) pin, and the RTS negative (-) pin to the CTS negative (-) pin
using a suitable jumper wire soldered on the 9-pin connector on the adapter end of the cable.
The 2-wire jumper switches the card from 4-wire to 2-wire mode. A jumper out, which is the factory default, sets the card
into 4-wire mode. A jumper installed sets the card into 2-wire mode.
