Data-Linc Group MDL500/MR Benutzerhandbuch - Seite 8

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MDL500 User Guide

Jumper Settings

There are several configuration options that can be selected by jumpers as described below. The jumper pins are internal and

are identified by lettering on the circuit board. Jumper pins are accessed by removing the four retaining screws on the top

cover of the enclosure and removing the cover.

Note: The header position locations are described with the MDL board oriented with the LED's to the left and the

connectors to the right.

DCE and DTE Settings

Both the MDL500 Master and Remote units are configured at the factory as DCE (Data Communication Equipment) for

connection to DTE (Data Terminal Equipment). A PC, PLC or Multiplexer is usually configured as DTE. If either the Master or

Remote DTE/DCE must be changed, this is accomplished by moving the jumpers on blocks "P1" and "P2" which are located

directly behind the DB25 RS232 connector on the rear panel. For example, as delivered, the Master unit P1 and P2 jumpers

are both set in the B-C position (DCE setting). To change to a DTE, move both jumpers to the A-B position. In DTE, data

into the DB25 will be on pin 3 and data out on pin 2.

Transmitter Output Level

The MDL500 allows the selection of either Normal or High Power (HP) transmitter output. The High Power output has six

times greater peak-to-peak transmitted signal and provides correspondingly greater signal to noise ratio. High Power

transmitter operation is generally preferred in applications involving sliding contacts or in very noisy EMI environments.

However, caution is advised in some cases since High Power carrier signals will result in more cross-talk to adjacent

conductors.

The jumper to select Normal or High Power is located at position TP2. High Power is selected when the jumper is positioned

center to left; Normal output is selected with center to right. When using the HP setting, the receiver gain should be set to

low. (See Receiver Gain below.) The factory setting is Normal, center to right. This header is positioned slightly below the

TOKO Coil marked "T5."

Receiver Gain

The MDL500 incorporates a receiver amplifier on the circuit board. This amplifier has low, normal and high gain settings

configured by a "T" shaped pin block near the center of the circuit board with pins marked "G1," "G2" and "G3" (the leg of the

"T"). G1/G2 is the high gain setting; G2, the normal medium gain; and G3/G2, the low gain. The units are delivered from the

factory set at normal gain because the transmitter has been factory set at normal output. The low gain setting should be

used on the receiver whenever the high power transmitter option is selected on the transmitter to avoid onboard cross-talk.

DATA-LINC GROUP

PN 161-10003-002B

rev 8/03