Datasheet

pn 8684R0 FOSTCDR-0812ds page 4/5
©2010 B&B Electronics. All rights reserved
PRODUCT INFORMATION B&B ELECTRONICS
www.bb-elec.com [e-mail] [e-mail]
International Office: 707 Dayton Road PO Box 1040 Ottawa, IL 61350 USA 815-433-5100 Fax [phone]
European Office: Westlink Commercial Park Oranmore Co. Galway Ireland [phone] Fax [phone]
RS-232
1. Loosen the screws to open the Serial TB Lead Clamps for the D, A,
and B terminals.
2. Insert the RS-232 Signal Leads into the TB. Refer to the diagram
above for DTE and DCE wiring configurations.
3. Tighten the screws to close the Serial TB Lead Clamps. Ensure the
clamps hold the leads securely. However, do not over tighten.
Installation Notes:
• DIP Switch Positions 1 through 5, 7 and 8 are not used in RS-
232 Mode. Set switch 6 to OFF.
• The wiring example shows a DTE device on one end and a DCE
device on the other.
• Handshaking signals are not passed through.
Fiber Optic
1. Ensure your fiber optic cable is terminated with an ST type
connector. 62.5/125 micro-meter multimode cable is
recommended.
2. Connect the converter’s transmitter to the distant end
receiver and vice-versa.
3. The fiber optic transmitter light is ON in the idle state.
Therefore, the RX indicator will be lighted when data is not
being transferred.
4. DIP Switch SW1-6 is used to select point-to-point or multi-
drop mode. For point-to-point, set the switch to OFF for
both converters. For multi-drop, set the switch to ON for
each converter in the ring. With SW1-6 in the ON position,
receive data will be looped back to the fiber optic
transmitter. Data will repeat around the ring until it finally
reaches its source. When the data is received by the
originator, timeout circuitry will prevent it from being re-
transmitted.
Maximum Converters in a Fiber Ring
Baud Rate
RS-232
RS-422/485
19.2 kbps and lower
32
32
38.4 kbps 16 24
115.2 kbps
2
8
Fiber Optic Point-to-Point
Fiber Optic Multi-drop Ring
RS-232 Loopback Test
1. Configure the converter for RS-232.
2. Set DIP Switch SW1-6 to OFF.
3. Cross-connect the fiber optic transmitter to the fiber optic
receiver using a multimode patch cord.
4. Connect a PC to the serial port.
5. Using Hyper Terminal or similar program, connect to the
appropriate COM port. Set the baud rate to match the
converter. Ensure Hyper Terminal local echo is OFF.
6. Transmit data. If the same character string is returned,
the test is good.