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Omega FMA 4000 User Manual: Communication Parameters And Connections

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
1
8
None
None
..... pin 8 of the 15 pin "D" connector (TX)
..... pin 15 of the 15 pin "D" connector (RX)
4

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