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Model FP-624D-HT

FP-624D-HT Instruction Manual Rev. 1.1 Page 31 of 44

4. RS-485 Modbus

Protocol

Model FP-624D-HT sensors feature Modbus™ compatible communications protocol output and are

addressable via the program mode. Communication is via a two wire, half duplex RS-485, 9600 baud, 8 data

bits, 1 stop bit, no parity, with the sensor set up as a slave device. A master controller up to 4000 feet away

can poll up to 256 different FP-624D-HT sensors. This number may not be realistic in harsh environments

where noise and/or wiring conditions would make it impractical to place so many devices on the same pair of

wires. If a multi-point system is being utilized, each sensor should be set for a different address. Typical

address settings are: 01, 02, 03, 04, 05, 06, 07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F, 10, 11…etc.

Sensor Serial ID numbers are factory default to 01. These can be changed in the field via the Operator

Interface described in Section 3.5.8.

The following table explains the details of the Modbus™ protocol that the FP-624D-HT sensor supports.

Table 3 Modbus Registers

Modbus Register

FC REG Content Description R/W Content Definition

Value Meaning Range

40000

Device Type

700

Sensor

40001

Read Detectable Range

1,2

R/W

100

For 0

100

–

0 to 10000

06 40001 Write Detectable Range 10000 For 0-10000

FP – Read only

TP – 20, 50, 100, 200

–

0 to 10000

PI – 0 to 10000

03 40002

Read Concentration

3,2

R 1000 Bound by range. If > range, this

value is in fault.

40003

Read AutoSpan Level

4,2

R/W

Span gas at 50

–

1% to 95% of Range

40003

Write AutoSpan Level

–

5% to 95% of Range (40001)

TP – 2% to 50% of Range (40001)

IR – 5% to 95% of Range (40001)

PI – 1% to 95% of Range (40001)

03 40004 Read Sensor Life R 85 For 85% sensor life

40005

Read Fault Status Bits

0x0001

Global Fault

0x0002

Auto Span Fault

0x0004 Temperature Fault

0x0008

20mA Fault

0x0010

Input Voltage Fault

0x0020

Memory Fault

0x0040

Processor Fault

0x0080 Clearing Fault

0x0100

Stability Fault

0x0200

Range Fault

0x0400 Sensor Fault

0x0800

Zero Fault

0x1 000

Sensor

Fault 2

0x2000 <reserved>

0x4000 In Calibration

0x8000 Communication Error

03 40006 Read Model # R 1, 2, 3, 4, 5

DM, FP, IR, TP, PID

respectively

03 40007 Read Days Since Cal R 29 29days

03 40008

4-20 Current Output

mA x100

R 400 4.00mA

03 40009

Read Input Voltage

V x100

R 2400 24.00V

03 40010 Read Temperature R 28 28 °C

03/

40011 Special #1 R/W

Function Dependant on Value

of 40006 (See Special Register

FC REG Content Description R/W Content Definition

Value Meaning Range

03/

40012

Special #2

R/W

Function Dependant on Value

of 40006 (See Special Register

Table)

03 40013 Special #3 R

Function Dependant on Value

of 40006 (See Special Register

Table)

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 47 48

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