Black Box MED100A specifications Fiber Optic, RS-232Loopback Test, Installation Notes

MED100A-0908-4/5

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.

•The wiring example shows a DTE device on one end and a DCE device on the other.

•Handshaking signals are not passed through.

p/n 6132r3

Fiber Optic Point-to-Point

Fiber Optic Multi-drop Ring

Fiber Optic

RS-232 Loopback Test

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

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.

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