Hoffer Flow Controls CAT3-AC-MIL User Manual page 33

Appendix B
Communications Interface
CAT3-AC-MIL is equipped with a serial communication
interface RS232 to allow changing flow sensor calibration
parameters (k-factors).
updated whenever the flow sensor is re-calibrated. The serial
port may be accessed by removing the two screws from the top
plate of the blue enclosure. External power must be supplied to
the CAT3-AC-MIL in order to communicate.
Communications with the CAT3-AC-MIL also requires the use
of the HOFFER HIT2A-301 Communications Cable and the
Hoffer Windows Device Configuration Software. The computer
serial port must be set to the following:
Baud rate:
Data bits:
Parity:
Stop bits:
Handshaking:
DB9
CD 1
Rx 2
Tx 3
DTR 4
SIG CO M 5
Appendix B – Communications
- Communications
VDC1
6 DSR
7 RTS
VDC2
8 CTS
9 NC
HIT2A-301 Communications Cable
The calibration parameters must be
2400
8
none
1
None
25
Molex
0511100 660
or
Equival ent
Pin 2
Pin 1
HP-325