dynasonics TFX Ultra User Manual

Totalizing
Pulse Output
Option
Total Pulse
RxD
TB1
Isolated Output
Total Pulse
Internal
2.8k…10k
Pullup
Resistor
V
CC
100 mA
Maximum
Figure 32: Energy model auxiliary totalizer output option
Wiring and configuration of the Energy model is similar to the totalizing pulse output for the Flow-Only model. This option
must use an external current limiting resistor.
RS485 Port
The RS485 feature allows up to 126 transmitters to be placed on a single three-wire cable bus. All transmitters are assigned a
unique numeric address that allows all of the transmitters on the cable network to be independently accessed. A Modbus RTU
command protocol is used to interrogate the transmitters. See “Communications Protocols” on page66.
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 5000 feet (1500 meters) are supported without repeaters or end-of-line resistors.
To interconnect transmitters, use three-wire shielded cable (like the Belden 9939 or equal). In noisy environments, connect
the shield on one end to a good earth-ground connection. Use a USB-to-RS485 converter (like the B&B Electronics
P/N 485USBTB-2W) to communicate with a PC running Windows XP, Windows Vista and Windows 7. For computers with
RS232C serial ports, use an RS232C-to-RS485 converter (like the B&B Electronics P/N 485SD9TB illustrated in Figure 34), to
interconnect the RS485 network to a communication port on a PC. If more than 126 transmitters must be monitored, an
additional converter and communication port are required.
OTE:N When a USB programming cable is connected, the RS485 and frequency outputs are disabled.
4-20 mA Out
Reset Total
RS485 Gnd
RS485 A(-)
RS485 B(+)
Model 485USBTB-2W
A (-)
B (+)
A (-)
B (+)
GND
USB to RS485
4-20 mA Out
Reset Total
RS485 Gnd
RS485 A(-)
RS485 B(+)
TD(A)-
TD(B)+
GND
GND
+12V
RS-485 Converter
Model 485SD9TB
RS-232
RS-485
To 12V DC
Supply
RS232 to RS485
Figure 33: RS485 network connections
Inputs/Outputs
Page 30 May 2016TTM-UM-00136-EN-06

dynasonics TFX Ultra Specifications

General

Brand	dynasonics
Model	TFX Ultra
Category	Measuring Instruments
Language	English