TxD Control

BlueStorm Installation Guide, Connect Tech Inc.

Figure 9 illustrates the jumper configurations for selecting +5V power or +12V power.

JA1

JA2

JA3

JA4

JA5

Port 1

JB1

JB2

JB3

JB4

JB5

Port 2

JC1

JC2

JC3

JC4

JC5

Port 3

JD1

JD2

JD3

JD4

JD5

Port 4

TxD control RxD control

RxD ± Termination/Bias RxD ± Termination/Bias TxD ± Termination

Figure 7: Jumper Configuration Example for 4 Port RS-422/485 BlueStorm/LP Models

JA0

JA1

JA2

JA3

JA4

JA5

Port 1

JB0

JB1

JB2

JB3

JB4

JB5

Port 2

JC0

JC1

JC2

JC3

JC4

JC5

Port 3

JD0

JD1

JD2

JD3

JD4

JD5

Port 4

RS-485 selection TxD control RxD control

RxD ± Termination/Bias RxD ± Termination/Bias TxD ± Termination

Figure 8: Jumper Configuration Example for BlueStorm/SP Opto Models

J1 position = +5V power

J2 position = +12V power

Figure 9: Jumper Configuration Examples for BlueStorm/SP RJ-11 Models

Install this jumper to enable the RS-485 transmitter only when sending data. This mode is useful for multi-drop and half-duplex operation when only one device is allowed to send data at a time. If the jumper is not installed, the transmitter will always drive the line to an idle state when not sending data.

RxD Control

Install this jumper to enable the RS-485 receiver only when NOT transmitting data. This is useful for two-wire half-duplex operation to prevent the transmitting device from receiving its own data as it sends. If this jumper is not installed, the receiver is always enabled and ready to receive data.

RxD ± Termination/Bias

Install this pair of jumpers to enable a 120 or 150 ohm terminator (model dependent) across the RxD+ and RxD- pins for the corresponding port. A biasing network is also enabled that drives the receiver to an inactive or safe mode. The receiver can still receive data from another device and the biasing helps to prevent the reception of data generated by noise on the transmission line. The two jumpers for RxD termination/bias must be installed and removed as a pair.

TxD ± Termination

Install this jumper to enable a 120 or 150 ohm resistor (model dependent) across the TxD+ and TxD- pins of the corresponding port.

Auto 485 (BlueStorm/LP 2 port RS-422/485 models and BlueStorm/SP Opto models only) Install this jumper to tri-state the transmitters of ports configured as RS-485 half duplex or multi-drop slave when the computer powers up or is reset. This jumper will be overridden once

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