Brookfield CAP2000 Viscometer - Manual (Page 31)

Brookfield Engineering Labs., Inc. Page 31 Manual No. M02-313-G0812
APPENDIX B - Communications
Printer Output - CAP 2000+
The cable connection on the CAP 2000+ Viscometer is a standard 25 pin parallel printer cable
connector.
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 1) 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:
Baude rate: 9600
Parity: None
Data bits: 8
Stop bits: 1
2 3 4 5
6 7 8 9
1
External Control
External Control
Serial Ground
Transmit Data (TxD)
Receive Data (RxD)
No Connection to Pin 1
Figure 1
The following pages review the transmit/receive commands between the CAP 2000+ and a
computer (Table 2), the byte status interpretation (Table 1) and a sample program for external
control of the CAP 2000+ Viscometer.