Name: Hach sc200
Brand: Hach
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RS232 Wiring Considerations

• Since the RJ11 connector and the screw block terminal use the

same signal source, only one can be used for establishing

RS232 communications.

• Connect the screw block terminal as follows:

• M90-19-R4 Device

• RxD <--------- TxD

• TxD ---------> RxD

• 0V ---------- 0V

RS485 Wiring Considerations

• Use shielded, twisted pair cables.

• Configure the network as a multidrop bus network.

• Minimize the stub (drop) length leading from each device to

the bus.

• Ideally, the main cable should be run in and out of the

networked device.

• Do not cross positive (A) and negative (B) signals.

• Positive terminals must be wired to positive

• Negative terminals must be wired to negative.

Figure 2-8. R-J11 Pin-out

2-8

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