Hardware reference guide

Intelligent/Special Purpose
360
35013379 02 October 2007
Response to
Read Rate
Sample
Command
The following table shows the responses to the read rate sample command.
Rate Sample
Mode Caution
If a version 02.00 or higher module replaces a module which has a version number
less than 02.00 in a Rate Sample mode application, extra software configuration
may be required.
Rate Sample mode is set using Command 1, CONFIGURE (01XX), 4X+1 register,
bit 13 = 1 (see the description of Command 1 in this section).
The following figure shows the module’s label.
In modules prior to V02.00, when Rate Sample mode was selected, input was
always handled as if it were generated by a pulse encoder. For example, 60 count
per revolution encoders, either pulse or quadrature types, would give a rate of 60 for
a one-second revolution when the interval was set for one second.
Register Value Description
300001 0400 Command echo
300002 XXXX Counter 1 Input rate low word
300003 XXXX Counter 1 Input rate high word: this register is a multiplier. As an
example: 30002 has a value of 324 and 30003 a value of 3.The
total count is (65,536 x 3) + 324 = 196,932
300004 0000 Counter 2 is disabled
300005 0000 Counter 2 is disabled
300006 0X00 X is the field power indicator
Note: To verify the version of the module, reference the indicated label found on
the top front of the module.
140
EHC 202 00
HI SPEED CTR
High Speed CTR 2CH
500KHz 02.00
Note: Modules labeled with PV
and SV designations are newer
than 02.00 marked models
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com