BB Electronics Cable Box FOSTCDR User Manual

DIN Mount Fiber Optic Converter CE  
Model FOSTCDR  
Document No. FOSTCDR2999  
This product Designed and Manufactured  
In Ottawa, Illinois USA  
of domestic and imported parts by  
B&B Electronics Mfg. Co. Inc.  
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 USA  
Phone (815) 433-5100 -- General Fax (815) 433-5105  
Home Page: www.bb-elec.com  
Sales e-mail: [email protected] -- Fax (815) 433-5109  
Technical Support e-mail: [email protected] -- Fax (815) 433-5104  
© Copyright 1999 B&B Electronics -- August 1999  
FOSTCDR2999 Manual  
Cover Page  
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
Description  
The FOSTCDR is designed to provide the most versatile  
connection possible between any asynchronous serial equipment  
using Fiber Optic cable. It allows any two pieces of asynchronous  
serial equipment to communicate full or half-duplex over two fibers at  
typical distances up to 2.5 miles. The converter can also be set up in  
"Repeater" mode to create a multi-drop master/slave configuration,  
allowing one serial device to talk to multiple slave devices around a  
fiber ring. The DIN rail mountable box makes it ideal for industrial  
cabinets and enclosures.  
RS-232 data signals up to 115.2K bps and RS-422, or RS-485  
data signals up to 460K bps are supported. Different standards can  
be mixed and matched to allow RS-232 devices to connect to your  
RS-422 or RS-485 system. This means the FOSTCDR can replace  
converters and isolators when connecting remote devices, while  
providing the EMI/RFI and transient immunity of optical fiber.  
The FOSTCDR supports both the Transmit and Receive data  
lines, and provides full hardware control of the RS-422/485 driver with  
B&B's Automatic Send Data Control circuit. Timeouts are dip-switch  
selectable between 0.10 and 2.2 ms. All serial connections are  
provided on terminal blocks, while the multi-mode fiber is connected  
via two ST connectors. The unit is powered by 10 to 30VDC at 140  
mA max.  
RS-232 Connections  
Connection of the FOSTCDR is simple and straightforward. The  
RS-232 driver and receiver are connected to 2 terminal blocks. The  
RS-232 DATA OUT is on terminal block (A), and the RS-232 DATA IN  
is on terminal block (D). Ground is located on terminal block (B) and  
(C), and power comes in on terminal block (F).  
RS-422 & RS-485 Connections  
The RS-422/485 driver and receiver are connected to 4 terminal  
blocks. Signal ground is on terminal block (M), and power comes in  
on terminal block (J). When connecting to a four-wire RS-422/485  
device or system, connect the output of your device to terminal block  
(L) (RDB or RD+) and terminal block (K) (RDA or RD+). Connect the  
input to your device to terminal block (H) (TDB or TD+) and terminal  
block (G) (TDA or TD-). For two-wire RS-485 systems, the driver and  
FOSTCDR2999 Manual  
1
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
receiver of the FOSTCDR must be connected together by tying  
terminal blocks (L) and (H) together and (G) and (K) together. This  
allows the FOSTCDR to communicate half-duplex over the same pair.  
Refer to Figure 1 for connection diagrams to your RS-422 or RS-485  
equipment.  
Figure 1: RS-422/485 Connection Diagrams  
FOSTCDR  
422/485 4W Device  
485 2 Wire Device  
FOSTCDR  
(K) RD A  
(K) RD A  
TD A (-)  
Data A (-)  
TD B (+)  
RD A (-)  
(L) RD B  
(G) TD A  
(L) RD B  
(G) TD A  
RD B (+)  
GND  
(H) TD B  
(M)  
Data B (+)  
GND  
(H) TD B  
(M)  
If termination is needed, the PCBD is laid out to allow a  
termination resistor (Rt) to be soldered in across the RD(A) and  
RD(B) lines. Removing R8 and R16 and replacing them with through-  
hole components can also change the off-state bias resistor values.  
Before making modifications to the FOSTCDR, be sure to consult  
B&B Electronics’ free RS-422/485 Application Note or other sources  
of information to see if termination is necessary. The Application  
Note is available from our Web site, or call and we will happily send  
you one at no charge.  
Fiber Optic Connections  
The FOSTCDR uses a separate LED emitter and photo-detector  
operating at 820 nm wavelength. Connections to the emitter and  
detector are on ST type connectors. Most multi-mode glass fiber  
size can be used including 50/125 mm, 62.5/125 mm, 100/140 mm,  
and 200 mm. One fiber is required for each connection between a  
transmitter and receiver. In a point to point configuration, two fibers  
are required between the two modems, one for data in each direction.  
A multi-drop ring configuration requires one fiber between TX and RX  
around the loop. See Figure 2 for typical point to point and multi-drop  
configurations.  
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FOSTCDR2999 Manual  
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
The most important consideration in planning the fiber optic link is  
the “power budget” of the fiber modem. This value represents the  
amount of loss in dB that can be present in the link between the two  
modems before the units fail to perform properly. This value includes  
line attenuation as well as connector loss. For the FOSTCDR the  
typical connector to connector power budget is 12.1 dB. Because  
62.5/125 mm cable typically has a line attenuation of 3 dB per Km at  
820 nm, the 12.1 dB power budget translates into 2.5 miles. This  
assumes no extra connectors or splices in the link. Each extra  
connection would typically add 0.5 dB of loss, reducing the possible  
distance by 166 m (547 ft.). The actual loss should be measured  
before assuming distances.  
Figure 2: Typical Setups  
Point to Point  
RS-232  
RS-422  
or RS-485  
Device  
or System  
RS-232  
RS-422  
or RS-485  
Device  
or System  
TX  
RX  
RX  
TX  
Duplex  
Multimode  
Fiber  
FOSTCDR  
SW1:6 = OFF  
FOSTCDR  
SW1:6 = OFF  
Multi-Drop Ring  
FullDuplex  
RS-232  
TX  
RS-422  
Multimode  
Fiber  
FOSTCDR  
SW1:6 = OFF  
or RS-485  
Device  
RX  
or System  
MASTER  
RS-232  
RS-422  
RS-232  
RS-422  
RS-232  
RS-422  
or RS-485  
or RS-485  
or RS-485  
Device  
or System  
Device  
or System  
Device  
or System  
Dip-Switch Setup  
The Dip-Switch (SW1) on the FOSTCDR defines the mode of  
operation when being used for RS-422 or RS-485. Positions 1  
through 5 on the switch determine the timeout of the RS-485 driver.  
Because the driver is controlled by hardware, a specific time must be  
set to tell the hardware how long to wait for data on the fiber side  
before turning off the RS-422/485 driver. If this time is set too short,  
FOSTCDR2999 Manual  
3
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
the driver could be disabled before transmission is complete, resulting  
in data corruption. If the time is set too long, the RS-485 device may  
respond before the RS-422/485 driver in the FOSTCDR is disabled,  
corrupting this response. We recommend that the timeout be set for  
approximately one character time or longer. The character times for  
several different baud rates are selectable on switch positions 1  
through 5. If you need a different timeout than what is provided, R10  
can be removed and replaced with a different value R9. Table 1  
shows the different timeout values for the switch positions as well as  
some typical R9 replacement values.  
Table 1: RS-485 Timeout Selection  
Pos. 1 Pos. 2 Pos. 3 Pos. 4 Pos. 5  
R9  
Time(ms)  
Baud Rate  
1200  
ON OFF OFF OFF OFF 820 KW  
ON OFF OFF OFF OFF 430 KW  
8.20  
2400  
4800  
4.30  
2.20  
1.30  
0.56  
0.27  
0.22  
0.14  
0.10  
0.06  
0.04  
0.02  
OFF OFF OFF OFF  
OFF OFF OFF ON OFF Not Used  
OFF OFF ON OFF OFF Not Used  
ON Not Used  
9600  
19.2K  
38.4K  
57.6K  
76.8K  
115.2K  
153.6K  
230.4K  
460.8K  
OFF ON OFF OFF OFF Not Used  
ON OFF OFF OFF OFF Not Used  
ON OFF  
ON ON  
ON  
ON OFF Not Used  
ON OFF OFF Not Used  
ON OFF OFF OFF OFF 6.2 KW  
ON OFF OFF OFF OFF 4.3 KW  
ON OFF OFF OFF OFF 2.2 KW  
Position 6 of SW1 sets the unit as a “Repeating” module or a  
“Terminating” module. When the FOSTCDR is set as a “Repeating”  
module, data arriving on the Fiber Optic receiver is repeated back out  
the transmitter. When set as a “Terminating” module, data arriving at  
the Fiber optic receiver is not sent back out the Fiber Optic  
transmitter. Position 6 must be turned “On” when the FOSTCDR is to  
be used as one of the Slaves in a multi-drop ring configuration. It  
must be turned “Off” when the FOSTCDR is to be used as the Master  
in a multi-drop configuration or as either end of a point to point  
communication line. See Figure 3 for typical system setups using  
the FOSTCDR in its different modes.  
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FOSTCDR2999 Manual  
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
Positions 7 and 8 of SW1 determine when the RS-422/485 driver  
and receiver are enabled. Position 7 controls the driver and Position 8  
controls the receiver. For RS-422 operation, set both switches to the  
“Off” position. For multi-drop RS-485 four-wire systems, position 7  
should be “On” and position 8 should be “Off.” This allows the  
receiver to be enabled all of the time and eliminates some possible  
timing problems. For RS-485 two-wire systems, both switches  
should be in the “On” position. This disables the RS-422/485 receiver  
whenever the driver is enabled, preventing data from being echoed  
back to the fiber side of the FOSTCDR. Table 2 illustrates the switch  
settings for typical setups.  
Table 2: 422/485 Switch Settings  
Position 7  
TX Enable  
Position 8  
RX Enable  
RS-485 2-Wire Mode  
(half duplex)  
RS-485 4-Wire Mode  
(full duplex)  
RS-422 Mode  
(full duplex)  
ON  
ON  
ON  
OFF  
OFF  
OFF  
Multi-Drop Operation  
A multi-drop configuration can be created by forming a ring of  
FOSTCDRs. Each transmitter is tied to the following converter’s  
receiver, starting at a master node and continuing around to each  
slave and back to the master. By setting SW1:6 to the “On” position  
on the slaves, all data sent from the master or preceding slaves is  
echoed back out the fiber transmitter to the rest of the slaves and  
eventually back to the master node.  
Because all data is echoed back, there are special  
considerations when constructing a multi-drop system. The master  
will see its own transmitted data. This means that the master device  
must be full-duplex (RS-232, RS-422, or four-wire RS-485) and that it  
must be capable of ignoring or otherwise accepting its own echoed  
transmission. Slaves must also be able to accept data from previous  
slaves in the loop.  
FOSTCDR2999 Manual  
5
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
Specifications  
Transmission Line: Dual multi-mode optical cable  
Point to Point Transmission: Asynchronous, half or full-duplex  
Multi-Drop Transmission: Asynch., half duplex, master/slave, ring  
Interfaces: RS-232, RS-422, or RS-485  
Data Rates: 0 to 115.2K bps RS-232; 0 to 460K bps RS-422/485  
Typical Range: Up to 2.5 miles (4.0 km) on multi-mode glass fiber  
Coupled Power Budget: 12.1 dB  
Optic Wavelength: 820 nm  
Connectors: Terminal blocks/serial connection, ST connectors/fiber  
Power Supply: Requires 10 – 30 VDC @ 140 mA max.  
Temperature Range: -20°C to 80°C  
Dimensions: 4.4”L x 3.0”W x 1.0”H (11.2 x 7.6 x 2.5 cm)  
6
FOSTCDR2999 Manual  
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
FOSTCDR Diagram  
Figure 3: FOSTCDR Circuit Diagram  
FOSTCDR2999 Manual  
7
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104  
 
FEDERAL COMMUNICATIONS COMMISSION  
RADIO FREQUENCY INTERFACE STATEMENT  
Class A Equipment  
This equipment has been tested and found to comply with the  
limits for Class A digital device, pursuant to Part 15 of the FCC  
Rules. These limits are designed to provide reasonable protection  
against harmful interference when the equipment is operated in a  
commercial environment. This equipment generates, uses, and can  
radiate radio frequency energy and, if not installed and used in  
accordance with the instructions, may cause harmful interference to  
radio communications. Operation of this equipment in a residential  
area is likely to cause harmful interference, in which case the user  
will be required to correct the interference at personal expense.  
FCC Class A Equipment Statement  
 

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