300-R010-45G datasheet(10/36 Pages) MAGNETROL

10 / 36 page

WIRING cont.

OUTPUT SIGNAL WIRING cont.

RS-485 Output

A shielded twisted pair should be used for the RS-485 wiring.

The “A” and “B” connections are made at the terminal block

to the right of the 16-button keypad as shown in Figure 5 on

page 8. The shield is connected with a female disconnect to

a connector located in the housing base, just below the sen-

sor connections.

1. Cut approximately 8" of insulation off the twisted shield-

ed cable.

2. Cut the shield wire down just short enough to crimp a

female disconnect (Sta-Kon®) connector. Crimp the con-

nector on and push this over the male connector locat-

ed at the base of the housing as shown in Figure 7.

NOTE:

If both the 4-20 mA and the RS-485 outputs are

being used, twist the shields together and follow Step 2

above.

3. The “A” and “B” wires should then be twisted together

and run up to the RS-485 terminal block located to the

right of the 16-button keypad as shown in Figure 7.

4. Connect the “A” wire from the control room converter to

the terminal marked “A” on the RS-485 terminal block

located to the right of the 16-button keypad as shown

in Figure 5.

5. Connect the “B” wire from the control room converter to

the terminal marked “B” on the RS-485 terminal block

located to the right of the 16-button keypad as shown

in Figure 5.

6. If connecting multiple Model 300/301 units in a daisy-

chain configuration, be sure to connect the wiring in

parallel and have the ending unit with the termination

resistor jumpered. Jumpers should be removed from

other units in the daisy chain. The three termination

jumper pins (JP1) are located behind the black protec-

tive cover and just below the RS-485 terminal block.

The last unit in the daisy chain should have a jumper

between pins 1 and 2. All other units in the daisy chain

should either have a jumper between pins 2 and 3, or

have no jumper at all.

NOTE: Polarity among units in loop must be observed.

NOTE: If connecting several units, note the color wire used

for A and B and ensure that the same designated color is

used for each of the units.

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