Model 3095FB Multivariable Transmitter with Modbus Protocol
Modbus Protocol Guide
Page 22 of 79
3.2 Communication Statistics
The following registers provide some communication statistics that may be used to gather
diagnostic information. The communications statistics will be reset when the 3095FB loses
power or if a Master Reset is performed. The registers will be reset to zero when the value of
the registers exceed the maximum value for an unsigned 16 bit number.
3.3 Write Protect Jumper
Once the transmitter has been configured, the configuration data can be protected by moving
the write protection (WP) to the ON position. This jumper is located on the Output Electronics
Board.
If the WP jumper is ON and the host tries to write to a register location that has the attribute
Write Protected (WP), the Modbus exception Illegal Data Address (02) will be returned.
Table 3-2 Communication Statistics
Modbus Access
DESCRIPTION
Address
Address
Type
Attributes
Functional
Area
Data / Control
0145 Input reg-
ister
RO Communi-
cation Sta-
tistics
Framing Error Count
0146 Input reg-
ister
RO Noise Error Count
0147 Input reg-
ister
RO Overrun Error Count
0148 Input reg-
ister
RO CRC Error Count
0149 Input reg-
ister
RO Busy Count
0150 Input reg-
ister
RO Good Message Count
*Attributes: R/W = Read/Write, RO = Read Only, WP = Write Protected
**These registers are available at multiple Modbus addresses (see Section 2.3
located in the Modbus Protocol Guide)
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