Section 3—CamCor Modbus Register Maps
Using CamCor Modbus Maps
Access Types
Each register has an access type as described in the table below:
Access Type
Description
Read Only (RO)
Register can only be read
Read/Write (RW)
Register can be read and written
Note
Some RW registers may return a “0” for the read function.
CamCor-Specific Modbus Protocol Constraints
Modbus protocol, as applied to CamCor Coriolis meters, has the following constraints:
•
Maximum data length for any message (read or write) is 64 bytes (32 register counts)
•
Maximum of 18 parameters can be updated/reset in 1 second
•
Parameters with several register types (U32, PAC, FP) must be updated using a single Function Code 16 message
•
A minimum 2.5 second wait time between sending Function Code 16 commands is required
Note
Attempting to update individual register types separately will return a “normal” response, but will not update the
value displayed on the device.
Updating Intervals
CamCor meters are synchronized to update Modbus readings every 1080 ms. Sending a read query of less than 1080 ms
may result in stale data, since the reading will not be updated before the query is sent. Therefore, establish a read query
time of greater than 1080 ms to ensure updated information is returned.
Modbus Registers
Note
Register numbers in the tables do not necessarily appear in consecutive numerical order. Non-consecutive num-
bers in the same table are denoted by a darkened line between the non-consecutive registers (decimal).
Device and System Information
Register
(Decimal)
Register
(Hex)
Description
Default
Data
Type
Data Range
Access
Device Information
0–7
Reserved
Firmware Versions
174
00AE
Main CPU Firmware Version
U16
RO
175
00AF
LCD Board Firmware Version
176
00B0
I/O Board Firmware Version
177
00B1
Maintenance Board Firmware Version
11
CamCor
™
Modbus Protocol
Section 3
Summary of Contents for CamCor
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