Local I/O
Serial I/O
D-2 Prima PRO & Sentinel PRO Mass Spectrometers User Guide Thermo Fisher Scientific
Table D–1. Serial communication jumpers
Jumper Fitted ( = fitted)
1
These links typically not required. In some cases (for example, long line lengths), some
combination of pull up and pull down jumpers might be required, and/or a termination resistor
(typically 120Ω) fitted to the terminal block. Exact requirements will depend on the
characteristics of the line, whether the connection is point-to-point or multi-drop, and the
configuration of other devices on the link.
2
Not available for HOST. For RS485, Rx+ must be linked to Tx+ and Rx- must be linked to Tx-
(the links should be fitted at the connection terminal block). If pull up or pull down jumpers are
required (see 1 above), only one set should be fitted (as shown).
Each serial I/O port has a set of four LEDs to indicate activity on that
port. For each port, the top pair of LEDs (one green, one red) is
associated with transmitted data and the bottom pair (again, one
green, one red) is associated with received data.
For either transmit or receive lines:
For RS232 communication, the green LED in each line is
normally on, and will toggle to the red LED when data is
flowing.
For RS422/485 communication, both LEDs are normally off and
the red LED will be on when data is flowing. Note that for
RS485, since transmit and receive lines are linked together (see
above), the transmit and receive LEDs should behave identically.
Fibre optic serial connection is available as an option for each of the
available serial ports (availability depends on the total amount of I/O
installed in the instrument enclosure). This allows extended
transmission distances compared to electrical serial connections.
Refer to Sections 3 and 5 (and Appendix A1 for hazardous areas) of
this manual for requirements and details of the fibre connections.
Refer also to the manufacturers data sheets for the fibre optic
converters.
For each fibre optic link, one fibre optic converter is installed in the
instrument enclosure and will be connected to a particular serial port
(different ports can be selected simply by unplugging the serial cable
Fibre Optic Serial
Connection
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