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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