Brookfield CAP2000 Viscometer - Manual (Page 28)

Brookfield Engineering Labs., Inc. Page 28 Manual No. M/94-310F
APPENDIX E - Communications
Printer Output - CAP 1000 & CAP 2000
On the CAP Viscometer end, the cable connection is a standard 25 pin parallel printer cable con-
nector.
RS 232 Output - CAP 2000
When connecting the CAP 2000 to a computer, use Brookfield Computer Cable (Part No. DVP-
80). If you are not using the Brookfield computer cable, jump (connect) pins 4 and 9 (refer to
Figure E1) on the CAP 2000 end of the serial cable. The cable connections are:
Com Port RxD (pin 2 (9 pin) or pin 3 (25 pin) to CAP Txd (pin 3)
Com Port TxD (pin 3 (9 pin) or pin 2 (25 pin) to CAP RxD (pin 2)
Com Port ground (pin 7) to CAP Serial Ground (pin 5)
The RS232 protocol is implemented as follows:
Baud rate: 9600
Parity None
Data bits: 8
Stop bits: 1
Transmit Data (TxD)
Receive Data (RxD)
No Connection to Pin 1
External Control
Serial Ground
External Control
1 2 3 4 5
6 7 8 9
Figure E1
The following pages review the transmit/receive commands between the CAP 2000 and a computer
(Table E1), the byte status interpretation (Table E2) and a sample program for external control of the
CAP 2000 Viscometer.