Aalborg DFM Digital - Manual (Page 9)

5
PIN FUNCTION
1 +15 Vdc (Optional +12 or +24 Vdc) Power Supply
2 0 5 Vdc or 4-20mA Flow Signal Output
3 0 5 Vdc or 4-20mA Temperature Signal Output (Optional)
4 0 5 Vdc or 4-20mA Pressure Signal Output (Optional)
5 (reserved)
6 (reserved)
7 (reserved)
8
Relay No. 1 - Common Contact
9 Relay No. 1 - Normally Open Contact
10 Relay No. 2 - Normally Closed Contact
11 RS485 (-) (Optional RS232 TX)
12 (No Connection)
13 Common
14
-15 VDC Power Supply (Only for ±15Vdc option)
15 Common, Signal Ground For Pin 2 (4-20 mA return)
16 Common, Signal Ground For Pin 3 (4-20 mA return)
17 Common, Signal Ground For Pin 4 (4-20 mA return)
18 Common, Power Supply (- DC power for 12 and 24 Vdc)
19 Common
20
RS232 Signal GND (RS-485 GND Optional)
21 Relay No. 1 - Normally Closed Contact
22 Relay No. 2 - Common Contact
23 Relay No. 2 - Normally Open Contact
24 RS485 (+) (Optional RS232 RX)
25 Chassis Ground
Figure b-1, DFM 25 Pin "D" Connector Configuration.
IMPORTANT NOTES: In general, "D" Connector numbering patterns are
standardized. There are, however, some connectors with nonconforming
patterns and the numbering sequence on your mating connector may
or may not coincide with the numbering sequence shown in our pin
configuration table above. It is imperative that you match the appropriate
wires in accordance with the correct sequence regardless of the
particular numbers displayed on the mating connector.
Make sure power is OFF when connecting or disconnecting any cables
in the system.
The (+) and (-) power inputs are each protected by a 400mA M (medium time-lag)
resettable fuse. If a shorting condition or polarity reversal occurs, the fuse will cut
power to the flow transducer circuit. Disconnect the power to the unit, remove the
faulty condition, and reconnect the power. The fuse will reset once the faulty con-
dition has been removed. DC Power cable length may not exceed 9.5 feet (3
meters).
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