Connect Tech CTIM-00015 TxD Control, RxD Control, RxD ± Termination/Bias￿, TxD ± Termination, Auto

BlueStorm Installation Guide, Connect Tech Inc.

	JA		JB		JC		JD
JD1		JD1		JD1		JD1		TxD control
JD2		JD2		JD2		JD2		RxD control
JD3		JD3		JD3		JD3		RxD ± Termination/Bias
JD4		JD4		JD4		JD4		RxD ± Termination/Bias
JD5		JD5		JD5		JD5		TxD ± Termination
	Port 1		Port 2		Port 3		Port 4

Figure 7: Jumper configuration example for 4 port RS-422/485 BlueStorm/LP models

	JA		JB		JC		JD
JA0		JB0		JC0		JD0		RS-485 selection
JA1		JB1		JC1		JD1		TxD control
JA2		JB2		JC2		JD2		RxD control
JA3		JB3		JC3		JD3		RxD ± Termination/Bias
JA4		JB4		JC4		JD4		RxD ± Termination/Bias
								TxD ± Termination
JA5		JB5		JC5		JD5
	Port 1
		Port 2			Port 3		Port 4

Figure 8: Jumper configuration example for BlueStorm/SP and BlueStorm/SP Opto models

J1 position = +5V power

J2 position = +12V power

Figure 9: Jumper configuration examples for BlueStorm/SP RJ-11 models

TxD Control

Install this jumper to enable the RS-485 transmitter only when sending data. This mode is useful for 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 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 150 ohm terminator 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 150 ohm resistor 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 boots or is reset. This jumper will be overridden once the operating system is booted by the current driver/software RS-485 mode. The jumper is used to ensure that a port will power-on tri-stated. For example, the RS-485 mode selection in the Windows control panel will override this jumper setting once a port is opened.

12 Revision 0.08