Communication Parameters And Connections - Omega FMA 4000 User Manual

Digital mass flow meters

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2.2.3 Communication Parameters and Connections

The digital interface operates via RS485 (optional RS232) and provides access to

applicable internal data including: flow, CPU temperature reading, auto zero, total-

izer and alarm settings, gas table, conversion factors and engineering units selec-

tion, dynamic response compensation and linearization table adjustment.

Communication Settings for RS485 / RS232 communication interface:

Baud rate:

Stop bit:

Data bits:

Parity:

Flow Control: ......................

RS485 communication interface connection:

The RS485 converter/adapter must be configured for: multidrop, 2 wire, half

duplex mode. The transmitter circuit must be enabled by TD or RTS (depending

on which is available on the converter/adapter). Settings for the receiver circuit

should follow the selection made for the transmitter circuit in order to eliminate

echo.

RS485 T(-) or R(-)

RS485 T(+) or R(+)

RS485 GND (if available) ...................... pin 9 of the 15 pin "D" connector (GND)

RS232 communication interface connection:

Crossover connection has to be established:

RS232 RX (pin 2 on the DB9 connector)

RS232 TX (pin 3 on the DB9 connector)

RS232 GND (pin 5 on the DB9 connector) ..... pin 9 of the 15 pin "D" connector (GND)

......................

...................... pin 8 of the 15 pin "D" connector (TX-)

...................... pin 15 of the 15 pin "D" connector (RX+)

9600 baud

None

..... pin 8 of the 15 pin "D" connector (TX)

..... pin 15 of the 15 pin "D" connector (RX)

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