User`s manual

Connect Tech Xtreme/104-Plus User’s Manual
Revision 0.04
14
Jumper Block Settings
The following jumper block diagram depicts typical settings on a four-port selectable
Xtreme/104-Plus or Xtreme/104-Plus Opto. Jumper blocks JA, JB, JC and JD control ports 1
through 4, respectively.
Figure 7: Example of various jumper block settings for four-port RS-232/422/485 models
In this example, port 1 is set to RS-232, port 2 is set to RS-422/485 half duplex, port 3 is set to
RS-422/485 full duplex, and port 4 is set to RS-422/485 multi-drop slave.
RS-485 Selection: Install this jumper to configure a port for RS-422/485 mode. If the jumper is
not installed, the port will function in RS-232 mode.
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.
Important port numbering note:
Due to differences between the quad and octal UARTS, the port numbering
for eight port models differs from the numbering for four port models.
Jumper blocks JA through JD control ports 1 through 4, respectively, on four
port models.
On eight port models, jumper blocks JA through JD control the odd numbered
ports and JE through JH control the even numbered ports, as follows:
JA = Port 1, JB = Port 3, JC = Port 5, JD = Port 7
JE = Port 2, JF = Port 4, JG = Port 6, JH = Port 8.
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 Xtreme/104-Plus CD.
JA0
JA1
JA2
JA3
JA4
JA5
JA
JB0
JB1
JB2
JB3
JB4
JB5
JB
Port 1
Port 2
JC0
JC1
JC2
JC3
JC4
JC5
JC
Port 3
JD0
JD1
JD2
JD3
JD4
JD5
JD
Port 4
RS-485 selection
TxD control
RxD control
RxD ± Termination/Bias
RxD ± Termination/Bias
TxD ± Termination