MercuryiTC
©2014 Oxford Instruments Omicron NanoScience. All rights reserved.
Page 17
2.7 Remote interfaces
The iTC contains several interfaces that can be connected to a remote PC:
• Serial RS232 and ISOBUS.
• Universal serial bus (USB).
• Ethernet 10/100 IEE802.3.
• Optional general purpose interface bus (GPIB) (IEEE-488). This requires a GPIB daughter
board.
The remote PC can send data to the iTC and read data from the iTC. Only one interface can be
active at a time.
Connectors for the communications interfaces are located on the rear panel of the iTC.
Oxford Instruments Omicron NanoScience ISOBUS
ISOBUS allows a single RS232 port on a computer to control a number of instruments
independently. This arrangement requires an ISOBUS cable, which carries a single Master
connector (25-way D-socket) and up to eight Slave connectors (25-way D-plug). Each slave
connector incorporates full optical isolation, so that each slave is isolated from the master and
from every other slave.
The slave connectors draw electrical power from the individual instruments, via the DCD signal.
The master connector draws electrical power from either the DTR or RTS signals from the
computer.
A special command protocol is required to use ISOBUS (see section 8.4.1).
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