Black Box Electronic Accessory Industrial Serial to Multi mode Fiber Optic Converter User Manual

MED100A-0908-1/5  
p/n 6132r3  
MED100A  
Industrial Serial to Multi-mode Fiber Optic Converter  
9Data Rates up to 115.2 kbps  
92.5 Mile (4 km) Range  
910 to 30 VDC Input Voltage  
9Wide Operating Temperature  
92000V Isolation  
9MODBUS ASCII/RTU Compatible  
9EMI/RFI Protection  
Specifications  
Serial Technology  
RS-232  
TD, RD, GND  
RS-485 2-Wire  
RS-422/485 4-Wire  
Serial Connector  
Data Rate  
RS-232  
RS-422/485  
Isolation  
Data A(-), Data B(+), GND  
TDA(-), TDB(+), RDA(-), RDB(+), GND  
Terminal Block (24 to 14 AWG)  
The MED100A is our Industrial Serial to Multi-mode Fiber  
Optic Converter. Designed for industry, it extends serial data  
range up to 2.5 miles and provides the most versatile  
connection possible between any asynchronous full or half-  
duplex serial equipment. In addition to direct point-to-point  
connectivity, it is capable operating in a multi-drop mode. This  
allows one serial device to communicate with up to 31 others  
around a fiber optic ring. Since it supports mixed serial  
standards, you can replace other converters and isolators and  
add the EMI/RFI immunity inherent to fiber optic  
communications.  
Up to 115.2 Kbps  
Up to Up to 460.8 Kbps  
2KV RMS, 1 minute  
MODBUS ASCII/RTU  
Fiber Optic Technology  
Multi-mode / 820 nm  
(-) 17 to (-) 10 dBm  
Industrial Bus  
Type / Wavelength  
Output Power  
Receive Sensitivity  
Cable  
Connector  
Data Rate  
(-) 25.4 dBm to (-) 24 dBm  
62.5/125 micro-meter  
ST  
9.6 TO 115.2 kbps  
2.5 miles (4 km)  
Transmitter Light ON  
Power  
External  
Maximum Distance  
Idle State  
Source  
Input Voltage  
Power Consumption  
Connector  
10 to 30 VDC  
4.2 Watts  
Terminal Block (24 to 14 AWG)  
Mechanical  
Serial TD, RD, and Power  
4.3 x 2.3 x .95 in (11 x 9 x 2.5 cm)  
35mm DIN Mount, Plastic  
0.4 lbs (182 g)  
In RS-232 mode, the MED100A supports transmit and  
receive data. Handshaking signals are not passed through.  
An Automatic Send Data Control circuit controls the RS-  
422/485 driver chip, eliminating the requirement for special  
software.  
LED Indicators  
Dimensions  
Enclosure  
Weight  
Environmental  
Op Temperature  
Storage Temp  
Op Humidity  
- 40 to 176°F (- 40 to 80°C)  
- 40 to 185°F (- 40 to 85°C)  
0 to 95% Non-condensing  
Regulatory  
Approvals  
MTBF  
MTBF Calc. Method  
FCC, CE,  
460854 hours  
Parts Count Reliability Prediction  
Easy to install and configure, it has an 8 position DIP  
Switch to set up the RS-422/485 parameters and terminal  
blocks to connect serial signals and power.  
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018  
Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746  
To contact us about Black Box products or services: [email protected]  
 
MED100A-0908-3/5  
p/n 6132r3  
RS-422 / RS-485 4-Wire  
RS-422/RS-485 Mode  
Selection  
1. RS-422/485 mode is selected by positioning DIP Switch  
positions 7 and 8 as shown below.  
Mode  
Position 7  
ON  
Position 8  
ON  
RS-485 2-Wire  
RS-485 4-Wire  
RS-422  
ON  
OFF  
OFF  
OFF  
RS-485 2-Wire  
1. Loosen the screws to open the Serial TB Lead Clamps for the  
G, H, K, L, and M terminals.  
2. Connect RS-422/485 signal leads as shown in the diagram.  
3. Connect the signal ground lead to terminal M.  
4. Tighten the screws to close the Serial TB Lead Clamps.  
Ensure the clamps hold the leads securely. However, do not  
over tighten.  
5. Position DIP Switch positions 1 through 5 for t he desired  
baud rate.  
6. Position DIP Switch positions 7 to ON and 4 to OFF for RS-  
485 4-Wire mode. Set DIP Switch positions 7 and 8 to OFF for  
RS-422 mode.  
Installation Notes:  
Not all RS-485 devices are marked correctly for Data (+) and  
(-), so if the slave devices don’t respond after going through  
the fiber converter, try swapping the wire pairs polarity to each  
converter. When there is no light received from the fiber in, the  
receive indicator will be On. You can interconnect or loop back  
the transmit fiber on one unit to the receive input on the same  
unit to verity the receive light goes out. If the transmit light is  
lighted all the time without data, the polarity of the RS-485 is  
reversed, or there is not enough bias, or termination loads on  
the RS-485 bus. Normal bias before termination is about 3.8  
to 4.0 VDC, Data (+) to (-).  
1. Loosen the screws to open the Serial TB Lead Clamps for the G,  
H, K, L, and M terminals.  
2. Jumper terminal G to terminal K and connect to RS-485 Data A (-)  
lead.  
3. Jumper terminal H to terminal L and connect to RS-485 Data B (+)  
lead.  
4. Connect the signal ground lead to terminal M.  
5. Tighten the screws to close the Serial TB Lead Clamps. Ensure  
the clamps hold the leads securely. However, do not over tighten.  
6. Position DIP Switch positions 1 through 5 for t he desired baud  
rate.  
7. Position DIP Switch positions 7 and 8 to ON for RS-485 2-Wire  
mode.  
Installation Notes:  
Not all RS-485 devices are marked correctly for Data (+) and (-),  
so if the slave devices don’t respond after going through the fiber  
converter, try swapping the wire pairs polarity to each converter.  
When there is no light received from the fiber in, the receive  
indicator will be On. You can interconnect or loop back the  
transmit fiber on one unit to the receive input on the same unit to  
verity the receive light goes out. If the transmit light is lighted all  
the time without data, the polarity of the RS-485 is reversed, or  
there is not enough bias, or termination loads on the RS-485 bus.  
Normal bias before termination is about 3.8 to 4.0 VDC, Data (+)  
to (-).  
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018  
Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746  
To contact us about Black Box products or services: [email protected]  
 
MED100A-0908-4/5  
p/n 6132r3  
RS-232  
Fiber Optic Point-to-Point  
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.  
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 Multi-drop Ring  
RS-232 Loopback Test  
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.  
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.  
Maximum Converters in a Fiber Ring  
Baud Rate  
19.2 kbps and lower  
38.4 kbps  
RS-232  
RS-422/485  
32  
16  
2
32  
24  
8
115.2 kbps  
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018  
Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746  
To contact us about Black Box products or services: [email protected]  
 
MED100A-0908-5/5  
p/n 6132r3  
Power  
7. An external 10 to 30 VDC power supply is required.  
Attach power leads as shown above.  
Mechanical Diagram  
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018  
Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746  
To contact us about Black Box products or services: [email protected]  
 

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