gohastings.com Hastings Entertainment Oxygen Equipment HFM-I-401 Manual De Usuario

 

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If the flow meter is configured for a voltage output, the signal will be available as a positive 

potential on pin 4 relative to pin 3 of the terminal strip. Since these pins are galvanically 
isolated, the signal cannot be read by an indicator between pin 4 and pin 1 of the terminal 

strip.  Pin 3 must be used as the return to properly read the output on pin 4. If an output that 
is referenced to power supply common is desired then pins 3 and 1 must be connected.  It is 

recommended that these signals be transmitted through shielded cable, especially for 
installations where long cable runs are required or if the cable is located near equipment that 

emits RF energy or uses large currents.  
Note: When the meter is configured with a voltage output it cannot generate a signal that is 

more than a few mV below the zero volt value; therefore the 0-5 volt and 0-10 volt units are 
limited in their ability to indicate a negative flow with the analog signal. 

The digital signals are available on a sealed female D-coded M12 connector that is designed for 
use on industrial Ethernet connections. There are many options for connecting to the M12. 

Hastings offers an 8 foot cable (stock# CB-RS232-M12) with a compatible male M12 connector to 
a 9-pin D connector suitable for connecting the 400 I series instrument directly to the RS232 
port on a PC. A cable to convert USB to RS232 9-pin is available from Hastings (stock# CB-USB-

RS232). Also, a 5 meter M12 male–male cable suitable for digital communications can be 
purchased from Hastings (stock# CB-ETHERNET-M12). Other length cables are available from 

Lumberg (#0985 342 100/5 M) or Phoenix. Converters from the M12 connector to a standard 
modular Ethernet connector are available from Hastings or from Lumberg (#0981 ENC 100). A 

compatible M12 connector suitable for field wiring can be acquired from Harting (21 03 281 
1405) or Mouser (617-21-03-281-1405).  
The pin-out for the digital connector is shown in Figure 2-5. 

3

4

1

2

4

3

2

1

SHIELD

PINS

GROUND

TRANSMIT

RECEIVE

UNUSED
UNUSED

RS232

GROUND

ETHERNET

RD+

TD+

TD-

RD-

RX- (B)

TX- (B)

TX+ (A)

RX+ (A)

RS485

GROUND

 

 

A Hastings 400-I Series flow meter is available 

with one of three digital communications 
interfaces, RS232, RS485, or Ethernet. Unless 

specified differently at the time of ordering, the 
flow meter is configured for RS232 operation. For 

each interface, there are changes that can be 
made to the configuration, either via software or 

hardware settings. A brief overview of these is 
included here. For more detailed information, 

consult the Hastings 400 Series Software Manual.  

The default configuration for the RS-232 

interface is 19200 baud, 8 data bits, no–parity, 
one stop bit. The baud rate is software 

selectable and can be overridden by a hardware setting.  Hardware settings for RS-232 and RS-
485 are enacted on 12 pin jumper field located on the left end of the top circuit board in the 

Jumper 

Enabled Disabled 

1 RS485 

RS232 

2 

Half Duplex 

Full Duplex 

3 TX 

Terminated Unterminated 

4 RX 

Terminated Unterminated 

5 9600 

Baud 

Software 

Selected 

6 

Addr = 99 

Software Selected 

Figure 2-5 Digital connector pin-out