Dynasonics MFX Series Insertion MagProbe Flow Meter - Manual (Page 23)

Rev. 01/11 -1.21- MFX
The RS485 Module allows up to 128 MFX systems to be placed on
a single three-wire cable bus. All meters are assigned a unique one
byte serial number that allows all meters on the cable network to be
independently accessed. A proprietary digital communications
protocol is used for this communication. An explanation of the
command structure is detailed in the Appendix of this manual. Flow
rate, total, signal strength and temperature (if so equipped) can be
monitored over the digital communications bus. Baud rates up to
9600 and cable lengths to 5,000 feet (1,500 meters) are supported
without repeaters or “end of line” resistors. ULTRALINK™ is also
compatible with a multiple MFX network, allowing individual meters
to be accessed, programmed, diagnosed and calibrated.
To interconnect meters, utilize three-wire shielded cable such as
Belden
®
9939 or equal. In noisy environments the shield should be
connected on one end to a good earth ground connection. An
RS232 to RS485 scond, such as B&B electronics p/n 485SD9TB
(illustrated in Figure 1.15) is required to interconnect the RS485
network to a communication port on a PC. If more than 128 meters
must be monitored, an additional scond and communication port is
required.
PART 1 - ISO-MOD
RS485
Figure 1.15
RS485 Network
Connections