Black Box MED100A User Manual

MED100A-0908-1/5 p/n 6132r3

Industrial Serial to Multi-mode Fiber Optic Converter

9 Data Rates up to 115.2 kbps
9 2.5 Mile (4 km) Range
9 10 to 30 VDC Input Voltage
9 Wide Operating Temperature
9 2000V Isolation
9 MODBUS ASCII/RTU Compatible
9 EMI/RFI Protection

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.

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.

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.

MED100A

Specifications

Serial Technology

RS-232 TD, RD, GND
RS-485 2-Wire Data A(-), Data B(+), GND
RS-422/485 4-Wire TDA(-), TDB(+), RDA(-), RDB(+), GND
Serial Connector Terminal Block (24 to 14 AWG)
Data Rate
RS-232 Up to 115.2 Kbps
RS-422/485 Up to Up to 460.8 Kbps
Isolation 2KV RMS, 1 minute
Industrial Bus MODBUS ASCII/RTU

Fiber Optic Technology

Type / Wavelength Multi-mode / 820 nm
Output Power (-) 17 to (-) 10 dBm
Receive Sensitivity (-) 25.4 dBm to (-) 24 dBm
Cable 62.5/125 micro-meter
Connector ST
Data Rate 9.6 TO 115.2 kbps
Maximum Distance 2.5 miles (4 km)
Idle State Transmitter Light ON

Power

Source External
Input Voltage 10 to 30 VDC
Power Consumption 4.2 Watts
Connector Terminal Block (24 to 14 AWG)

Mechanical

LED Indicators Serial TD, RD, and Power
Dimensions 4.3 x 2.3 x .95 in (11 x 9 x 2.5 cm)
Enclosure 35mm DIN Mount, Plastic
Weight 0.4 lbs (182 g)

Environmental

Op Temperature - 40 to 176°F (- 40 to 80°C)
Storage Temp - 40 to 185°F (- 40 to 85°C)
Op Humidity 0 to 95% Non-condensing

Regulatory

Approvals FCC, CE,
MTBF 460854 hours
MTBF Calc. Method Parts Count Reliability Prediction

Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018

Tech Support and Ordering: 724-746-5500 - Fax: [phone]

To contact us about Black Box products or services: [e-mail]

MED100A-0908-2/5 p/n 6132r3

Package Contents

• MED100A Industrial Serial To Multi-mode Fiber Optic
Converter

• Datasheet

• Fiber Optic Dust Cover (installed)

1 Fiber Connectors Multi-mode, ST Connectors
2 PWR LED ON When Power Applied
3 TD LED On When Serial Data Transmitted
4 RD LED On When Serial Data Received
5 DIP Switch 8 Position,
6 Terminal Blocks Serial Data and Power

Pos ON OFF

1 RS-422/485 Baud Rate Selection
2 RS-422/485 Baud Rate Selection
3 RS-422/485 Baud Rate Selection
4 RS-422/485 Baud Rate Selection
5 RS-422/485 Baud Rate Selection
6 FO Multi-drop Ring FO Point-to-Point
7 RS-422/485 Mode Selection
8 RS-422/485 Mode Selection

Front Panel

DIP Switch (SW1)

Baud 1 2 3 4 5 R9 TIME OUT

1200 ON OFF OFF OFF OFF 820 kΩ 8.20 ms
2400 ON OFF OFF OFF OFF 430 kΩ 4.30 ms
4800 OFF OFF OFF OFF ON None 2.20 ms
9600 OFF OFF OFF ON OFF None 1.30 ms

19.2K OFF OFF ON OFF OFF None 0.56 ms

38.4K OFF ON OFF OFF OFF None 0.27 ms

57.6K ON OFF OFF OFF OFF None 0.22 ms

76.8K ON OFF ON ON OFF None 0.14 ms

115.2 K ON ON ON OFF OFF None 0.10 ms

153.6K ON OFF OFF OFF OFF 6.2 kΩ 0.06 ms

230.4K ON OFF OFF OFF OFF 4.3 kΩ 0.04 ms

460.8K OF OFF OFF OFF OFF 2.2 kΩ 0.02 ms

Terminal Signal

A RS-232 RD (OUTPUT)
B GND
C GND
D RS-232 TD (INPUT)
E NOT CONNECTED
F +10 TO 30 VDC
G RS-422/485 TDA(-) / DATA A(-)
H RS-422/485 TDB(+) / DATA B (+)
J +10 TO 30 VDC
K RS-422/485 RDA(-) / DATA A (-)
L RS-422/485 RDB(+) / DATA B (+)

1. Angle the converter DIN clip over the top of the DIN

2. Move the converter so that it is parallel with the DIN

The Dip-Switch on the MED100A defines the mode of operation
when being used for RS-422 or RS-485. Positions 1 through 5
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, the driver
could be disabled before transmission is complete, resulting in
data corruption. If the time is set too long, the device may respond
before the RS-422/485 driver in the MED100A is disabled,
corrupting this response. Set the timeout 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. This table shows
different timeout values for the switch positions as well as R9
replacement values.

Terminal Block

DIN Rail Mounting

rail.

Rail and snap the DIN clip into place..

RS-422/485 Baud Rate /

Timeout

Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018

Tech Support and Ordering: 724-746-5500 - Fax: [phone]

To contact us about Black Box products or services: [e-mail]