Cannon Instrument CMRV-5000 - Manual (Page 123)

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CANNON ® Mini-Rotary Viscometer CMRV-5000 Instruction & Operation Manual
Version 1.0b—August, 2011; CANNON ® Instrument Company
2139 High Tech Road • State College, PA • 16803 • USA
CHAPTER
D
APPENDIX D —
MULTI-UNIT CONFIGURATION
Introduction
The CMRV-5000 instrument have been designed to permit multi-unit
configurations of up to four CMRV units. Configuration is accomplished
via a “daisy-chain” technique using RS-485 connections.
A multi-unit interface kit containing all required
items for multi-unit configuration is available
from CANNON
® (Catalogue # 9728-R40 for
120V units; #9728-R45 for
240V units).
Placement of multiple units
The practical “hands-on”
realities of viscosity and yield
stress testing suggest orienta-
tion of CMRV units in close
proximity with the computer
controlling the testing. Appro-
priate cables
(8' lengths) are provided with
the interface kit for this
purpose.
Procedure
Using the interface kit provided by CANNON ® , complete the multi-unit
configuration as follows:
1. Make sure the power is switched off to the computer and all instru-
ments to be configured.
2. Locate the RS-232 to RS-485 converter provided with the interface
kit.
3. Plug the converter’s RS-232 25-pin connector into the COM port
you selected for multi-unit configuration during installation of the
CMRV software. If you are using COM 1, a DB-25 to 9-pin adaptor
may be required.
4. Select a CMRV unit as the first in the “daisy chain” and attach the
CAT-5 cable to the RS-485 connection marked IN on the first CMRV
chassis (see diagram, next page):