User`s guide

Copyright © 2004 EIM COMPANY, INC. • 13840 PIKE ROAD • MISSOURI CITY, TX. 77489
Page 44
Controlinc 1746-C (Version 5.21) Network Master Users Guide (2004-11-18)
Words [9 & 10]: FUNCTION: Poll Additional Holding Register From Entire Network
This operation allows the operator the chance to poll the entire network for any particular
holding register. The register values polled are stored in table [14]. This data is retrieved with
a separate Modbus read command when the particular actuator is being polled (scanned).
This data is retrieved with a separate Modbus read command each time an actuator is polled
(scanned).
FORMAT:
Word [9] … The holding register desired.
Word [10] … This is a flag that indicates whether or not to start requesting that register
from the actuators when scanning.
If Word [10] == 0 do not poll for the register.
If Word [10] =/= 0 (any non-zero value) … poll for the register specified in word [9].
By default, Words [9 & 10] == 0 … do not poll.
Words [11
14]: FUNCTION: Poll Additional Block of Registers From Single (Specified) Actuator
This operation allows the operator the chance to poll a single actuator for a block of registers.
The register values returned are stored in table [15] such that …
Table [15] – words [4-7] … header information about information returned.
Table [15] – words [8-13] … not used … reserved.
Table [15] – words [14 - 63] … register information returned.
This data is retrieved with a separate Modbus read command when the particular actuator is
being polled (scanned).
FORMAT:
Word [11] … The actuator address to get the block of registers from.
Word [12] … The register number for the 1
st
holding register in the block to retrieve.
Word [13] … The total number of registers to retrieve.
Word [14] … This is a flag that indicates whether or not to start requesting that block
of registers from that actuator when polling it.
If Word [14] == 0 do not poll for the block of registers.
If Word [14] =/= 0 (any non-zero value) … poll for the block of registers.
By default, Words [11
14] == 0 … do not poll.