FLOYD User Manual rev 1.09
www.diamondsystems.com
Page
31
Protocol Mode Selection and Enable Termination: JP2
The Jumper Block
JP2
provides the options to select RS232, RS422, and RS485 protocols on the serial
ports. By default, Jumper position 1 in the RS232 in full-duplex mode is selected.
Jumper Block JP2
Position 1
Position 2
Configuration
In
Out
Serial Ports 1-2 RS-232 Mode (Default selection)
Out
In
Serial Ports 1-2 RS-485 Mode
Out
Out
Serial Ports 1-2 RS-422 Mode
Jumper Block
JP2
also provides the capability to enable termination resistors on the serial ports in
RS422/RS485 protocol modes. The Jumper configurations are specified in the following table and illustrated
below. Normally both jumpers for a port will be either installed or uninstalled (3 and 4 together, 5 and 6
together).
Jumper Block JP2
Jumper Position
Configuration
3
121E Termination Enabled for SER2 TX RS-485/RS-422 Mode
4
121E Termination Enabled for SER2 RX RS-485/RS-422 Mode
5
121E Termination Enabled for SER1 TX RS-485/RS-422 Mode
6
121E Termination Enabled for SER1 RX RS-485/RS-422 Mode
Default: No jumpers are mounted. RS-232 is the default selected protocol.
Jumper block JP2 with jumpers installed for line
termination on both ports 1 and 2 in RS-422 or RS-
485 mode
USB 1 Host/Device Select: JP3
