Connect Tech BlueStorm/Express User Manual
Revision 0.15
15
TxD ± Termination
: Install this jumper to enable a 150 Ohm resistor across the TxD+ and TxD-
pins of the corresponding port.
Half Duplex
and
Multi-drop
modes require you to select the appropriate mode via
software. Please refer to the
readme.txt
files found in the appropriate directories on
the CD.
Tri-state Operation
Jumper block J2 (see
Figure 1
for an example) controls Tx tri-state on boot for ports configured in
RS-485 half duplex or multi-drop modes. This jumper block will have no effect on ports
configured as RS-232 or RS-485 full duplex.
For BlueStorm/Express 2/4 port cards, jumpering position 1 disables tri-state on boot for ports 1
and 2. Jumpering position 2 disables tri-state on boot for ports 3 and 4.
For BlueStorm/Express Opto and BlueStorm/Express LP Opto cards, jumpering position 1 enables
tri-state on boot for ports 1 and 2. Jumpering position 2 enables tri-state on boot for ports 3 and 4.
Jumper block J1 is used in diagnostic modes and should be left unpopulated unless directed
otherwise by Connect Tech’s technical support in the diagnosing of a system problem.
Power-On Tri-state (BlueStorm/Express Opto 1 kV model only)
BlueStorm/Express Opto 1 kV models offer a power-on tri-state similar to the Auto-485 mode
selection listed above. The BlueStorm/Express Opto 1kV will tri-state ports configured as RS-485
half duplex or multi-drop slave.
Jumper J1 controls the power-on tri-state functionality. Install a jumper on the first location of the
J1 in order to tri-state Port 1 at power-on. Install a jumper on the second position for Port 2, etc.
The ports will not come out of tri-state until the driver begins transmitting on the associated port.
Installing a jumper on J1 will have no effect on ports configured in RS-232 mode.
Half Duplex
and
Multi-drop Slave
modes require you to select the appropriate mode via
software. Please refer to the
readme.txt
files found in the appropriate directories on the
BlueStorm/Express CD.