User Manual i4MC&V/EN M/C
iSTAT i4MC&V
Page 12
Con
nection information for COM will be shown on a label as depicted in table 2-1.
The co
nnection of RS232 communications is usually between the i4MC/V and a PC, the
maximum connection length is 15 metres.
RS485 communications enables simultaneous connection to a maximum of 32
communicating devices; two-wire RS485 only is used. For RS485 communications, the PC
will require either an internal RS485 communications port or an external RS232/RS485 or
USB/RS485 interface. In both cases the device must provide automatic RS485 data flow
control. The maximum connection length is 1000 metres. Conductors A and B should be
terminated with a 120Ω terminating resistor on the units at each end of the RS485 network.
Connection Label
TABLE 2-1: RS232 AND RS485 CONNECTIONS
2.4.2 USB communications
The i4MC/V transducer is always supplied with a USB port on the underside, under a
removable plastic cover, for programming using an USB type mini B connector.
Note: The USB port has only Basic Insulation and can only be used
when there is no wiring connected to the main terminals.
Note: The Cover over the USB connector must be fitted prior to
installation or storage, if not the Warranty on the product will be void.
USB communication serves as a fast peer-to-terminal data link. The instrument is detected
by the host as a USB 2.0 compatible device.
See the QDSP manual for details of how to connect using the USB port.
2.4.3 Communication connection details
Connector Terminals Position RS232 RS485
21 Rx A
22 GND NC
SCREW
TERMINAL
23 Tx B
USB-mini B
Standard USB 2.0 compatible cable recommended (Type
mini B plug)
TABLE 2-2: COMMUNICATIONS
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