12 Installation
HP-310
4-2
Communications Connections
The RS232 serial port connector is located under the top plate of CAT1
and may be accessed by removing the two screws from the top plate. A
matching connector is provided with HOFFER HIT2A-301
Communications Cable. CAT1 unit has to be powered from external
supply in order to be able to communicate. Additional power for CAT1
communication circuitry is supplied by the RS232 serial port of the
computer/terminal. COM port settings must be set as follows:
Baud Rate: 2400
Data Bits: 8
Parity: None
Stop bits: 1
Handshaking: None
HOFFER HIT2A-301 Communications Cable
4-3
Wiring
When installing the CAT1, it is good practice to use shielded cable.
The shield should be connected to earth ground near the instrument.
The other end of the shield should not be connected.
In order to comply with the requirements for Electromagnetic
Compatibility, as per EMC-Directive 89/336/EEC of the Council of
European Community, this wiring practice is mandatory.
Tx 3
Rx 2
DTR 4
SIG COM 5
CD 1
6 DSR
7 RTS
8 CTS
9 NC
DB9
VDC1
VDC2
Pin 2
Pin 1
Molex
0511100660
or
Equivalent
