GF 3-9900.270-MX Assembly instructions

The Modbus Module 3-9900.270-MX allows the Signet 9900 SmartPro® Transmitter to
connect to a Modbus master compatible device. The Modbus Module supports RTU or
ASCII modes over serial RS485 communication links.
The Modbus Module has an internal programmable network termination for the
communication link enabled by Modbus command.
English
*3-9900.270.090*
3-9900.270.090 Rev 4 08/19
Signet 9900 Modbus Module
Installation and Programming
• Modbus RTU and ASCII modes, RTU is Default Mode.
• 1200, 2400, 4800, 9600, 19200. 38400, 57600, and 115200 Baud rates,
19200 is default Baud rate
• Parity can be selected as Even, Odd, or None, Even is default Parity
• Modbus Address 1 to 247, 34 is default Modbus Address
• Data Bits, automatically selected based on Mode. RTU Mode 8 Data bits,
ASCII Mode 7 Data bits.
• Stop Bits, automatically selected based on Mode, RTU Mode 1 Stop bit,
ASCII Mode 2 Stop bits.
• Power 12 to 24 VDC Nominal 10.6 to 32 VDC max regulated.
Specifi cations
System Overview
Installation
If the 9900 Base Unit will be mounted in a panel, plug-in modules may be installed either
before or after the base unit is mounted.
If the 9900 Base Unit will be mounted using the accessory wall mount kit (3-9900.392), install
plug-in modules fi rst.
If the Direct Conductivity/Resistivity Module or Current Loop Module will be included in your
unit, install the Modbus module fi rst and then install Conductivity/Resistivity Module over the
Modbus Module.
To install the Modbus module, carefully align the module pins into its plug (see illustration)
and push the module straight in until the tabs on the bottom edge snap into place.
To uninstall, squeeze tabs, grasp the module and pull straight out.
Modbus Module
Modbus Module
DC Power
DC Power
Loop Voltage
Loop Voltage
Description
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Important! Do not exceed 32 VDC
or permanent damage to the
Modbus Module will occur.
Start Up Communication Parameters
The Modbus communication parameters
for 9900 Gen 1 through Gen 4 transmitters
are set via Modbus. The Modbus module
is shipped from the factory, and can
be reset in the fi eld, with the following
communication parameters. See the
Communication Setting Programming fl ow
chart below.
Setting Default
Value
Modbus Address 34
Modbus Network Termination Off
Modbus Mode RTU
Baud Rate 19200
Parity Even
Endian Big
Start Up Communication Parameters

2Signet 9900 Modbus Module
Caution / Warning / Danger
Indicates a potential hazard. Failure to follow all warnings
may lead to equipment damage, injury, or death
Electrostatic Discharge (ESD) / Electrocution Danger
Alerts user to risk of potential damage to product by ESD,
and/or risk of potential of injury or death via electrocution.
Personal Protective Equipment (PPE)
Always utilize the most appropriate PPE during
installation and service of Signet products.
Refer to your local Georg Fischer Sales offi ce for the most
current warranty statement.
All warranty and non-warranty repairs being returned must
include a fully completed Service Form and goods must be
returned to your local GF Sales offi ce or distributor.
Product returned without a Service Form may not be
warranty replaced or repaired.
Signet products with limited shelf-life (e.g. pH, ORP, chlorine
electrodes, calibration solutions; e.g. pH buff ers, turbidity
standards or other solutions) are warranted out of box but not
warranted against any damage, due to process or application
failures (e.g. high temperature,
chemical poisoning, dry-out) or
mishandling (e.g. broken glass,
damaged membrane, freezing
and/or extreme temperatures).
Thank you for purchasing the Signet line of Georg Fischer
measurement products.
If you would like to register your product(s), you can now
register online in one of the following ways:
• Visit our website www.gfsignet.com.
Under Service and Support click on
Product Registration Form
• If this is a pdf manual (digital copy), click here
Warranty Information
Product Registration
Safety Information
CAUTION
Exercise care when installing module.
Do not bend connecting pins.
Align pins and connectors then push module firmly
into place.
Avoid Electrostatic Discharge (ESD)
● Minimize handling of module to reduce the possibility of
damage due to ESD.
● Handle module by the edges.
● Never touch any exposed circuitry or contacts.
● Wear an anti-static wristband, stand on an anti-static mat, or
keep one hand touching a properly grounded pipe or other
properly grounded piece of metal when handling module.
Power and Output Wiring
Three versions of the Modbus module are available to
accommodate installation site requirements.
Brown
Yellow
Black
White
Gray
D0 (RS485 -) Pin 2
D1 (RS485 +) Pin 1
V+ (12 to 24 VDC) Pin 3
V- (12 to 24 VDC Common) Pin 4
Com/Reset GND Pin 5
Brown D0 (RS485 -)
Yellow D1 (RS485 +)
Black V+ (12 to 24 VDC)
White V- (12 to 24 VDC Common)
Gray Com/Reset GND
Modbus Module
M12 Connector
Male front view
3-9900.270-M3 version: with M12 Connector (Field Mount Only)
Cable assembly with 6” wires with M12 Connector
3-9900.270-M2 version: Terminal board (Panel Mount Only)
Cable assembly with 3” wires, inner-connect to board
3-9900.270-M4 version: Wire Cable
Cable assembly with 6” Wires - pig tail
Brown
Yellow
Black
White
Gray
D0 (RS485 -)
D1 (RS485 +)
V+ (12 to 24 VDC)
V- (12 to 24 VDC Common)
Com/Reset GND
Pin 5
Pin 3
Pin 4 Pin 1
Pin 2
PWR +
PWR -
Loop +
Loop -
Gnd D0 (RS485 -) D1 (RS485 +)
Modbus Module
Modbus Module
Reset Switch
Reset Switch
Reset Switch
Loop Voltage
Modbus Module
DC Power
Plug in Module,
directing wires
around Power/OC
terminals. Do not
pinch wires!
3-9900
Panel Mount
Transmitter
Example showing M2 version
For M2 panel installation.
Restrain terminal block assembly
prior to shipping.

3
Signet 9900 Modbus Module
To Reset 3-9900.270-M1
Connect the orange wire to the gray wire as shown. Cycle
power on the unit and then disconnect the orange and gray
wires.
Note: cover the wire ends with an insulator such as electrical
tape to prevent damage to the 9900 or other devices.
Reset
• If the 9900 Base Unit will be mounted in a panel, plug-in modules may
be installed either before or after the base unit is mounted.
• If the 9900 Base Unit will be mounted using the accessory wall mount
kit (3-9900.392), install plug-in modules fi rst.
• If the Direct Conductivity/Resistivity Module or Current Loop Module
will be included in your unit, install the Modbus module fi rst and then
install Conductivity/Resistivity Module over the Modbus Module.
• Attach the output connector to the terminal block on the Modbus Module
prior to installing in the 9900. When inserting the Modbus module with the
wiring connector ensure the wires are not pinched by the power or open
collector terminal blocks of the 9900.
1. Disconnect power from the 9900.
2. Attach the wire harness prior to installing the module.
3. Carefully align pins and connectors then push module firmly
into place
(see illustration) .
4. Ensure the cable is not crimped between the module
housing and the 9900 Power or OC terminals.
5. To uninstall, squeeze tabs, grasp the module and pull
straight out.
Example showing M3 version
Installation
Brown
Yellow
Black
White
Gray
D0 (RS485 -) Pin 2
D1 (RS485 +) Pin 1
V+ (12 to 24 VDC) Pin 3
V- (12 to 24 VDC Common) Pin 4
Com/Reset GND Pin 5
Brown D0 (RS485 -)
Yellow D1 (RS485 +)
Black V+ (12 to 24 VDC)
White V- (12 to 24 VDC Common)
Gray Com/Reset GND
Modbus Module
M12 Connector
Male front view
3-9900.270-M3 version: with M12 Connector (Field Mount Only)
Cable assembly with 6” wires with M12 Connector
3-9900.270-M2 version: Terminal board (Panel Mount Only)
Cable assembly with 3” wires, inner-connect to board
3-9900.270-M4 version: Wire Cable
Cable assembly with 6” Wires - pig tail
Brown
Yellow
Black
White
Gray
D0 (RS485 -)
D1 (RS485 +)
V+ (12 to 24 VDC)
V- (12 to 24 VDC Common)
Com/Reset GND
Pin 5
Pin 3
Pin 4 Pin 1
Pin 2
PWR +
PWR -
Loop +
Loop -
Gnd D0 (RS485 -) D1 (RS485 +)
Modbus Module
Modbus Module
Reset Switch
Reset Switch
Reset Switch
To Reset the 3-9900.270-M2, 3-9900.270-M3 and
3-9900.270-M4
1. Located on the Modbus Module, move the reset switch
in down position, away from the Open Collector Terminals.
2. Cycle power on the unit.
This resets unit to factory settings.
Once reset, move the reset switch to the up position,
toward the Open Collector Terminals.
IMPORTANT
For normal operation the reset switch
must be up, near the Open Collector
Terminals.
Modbus Module
Connector
wires
Plug in Module,
directing wires
around Power/OC
terminals. Do not
pinch wires!
Conduit
Base
3-9900
Field Mount
Transmitter
M12 connector
Silver side of
connector toward the
center of the module
Brown Pin 1 D1 (RS485 +)
White Pin 2 D0 (RS485 í)
Blue Pin 3 V+ (12 to 24 VDC)
Black Pin 4 Common (VDC)
Gray Pin 5 Common (RS485)
5541-5005 (159 855 021) or
5541-5010 (159 855 022)
M12 Cable Wiring Diagram

4Signet 9900 Modbus Module
Register Size Read/Write Data Type Description
49001 1 Read/Write UINT Modbus Address 1 to 247 (Default 34)
49002 1 Read/Write UINT Network Termination, 1 = ON 0 = Off (Default 0)
49003 1 Read/Write UINT Modbus Mode 0 Modbus RTU 1 Modbus ASCII (Default 0)
49004 1 Read/Write UINT Baud Rate 0 = 1200, 1 = 2400, 2 = 4800, 3 = 9600, 4 = 19200,
5 = 38400, 6 = 57600, 7 = 115200 (Default 4)
49005 1 Read/Write UINT Parity 0 = No Parity, 1 = Odd Parity, 2 = Even Parity (Default 2)
49006 1 Read/Write UNIT Floating Point Little Endian = 0, Big Endian = 1 (Default 1)
49007 1 Read/Write UINT Write 0 (zero) to save registers, Write Modbus Address to save
registers and reboot
Register Size Read/Write Data Type Description
40001 2 Read UINT Status
40003 2 Read Float Primary Reading
40005 2 Read Float Secondary Reading
40007 1 Read UINT Measurement Type
40008 1 Read UINT Primary Units of Measure Code
40009 1 Read UINT Secondary Units of Measure Code
Register Size Read/Write Data Type Description
49104 1 Read UINT 9900 HSB Transactions
49105 1 Read UINT Second Counter
49106 1 Read UINT Bus Message Counter
49107 1 Read UINT Bus Message Error Counter
49108 1 Read UINT Slave Exception Counter
49109 1 Read UINT Slave Message Counter
49110 1 Read UINT Slave No Response Counter
49111 1 Read UINT Slave NAK Counter
49112 1 Read UINT Slave Busy Counter
49113 1 Read UINT Bus Character Overrun Counter
Live Reading
Communication Settings
Communication Diagnostic Registers
49501 15 Read STR Vendor Name “Georg Fischer Signet”
49516 10 Read STR Product Code “3-9900-1x”
49526 10 Read STR Major/Minor Revision 9900 Transmitter “xx-xxX”
49536 15 Read STR Vendor URL “www.gfps.com”
49551 10 Read STR Product Name “SmartPro”
49561 10 Read STR Model Name “9900”
49571 10 Read/Write STR User Application Name
49581 5 Read/Write STR Tag Name
49586 5 Read/Write STR Location
49591 5 Read STR 9900 Serial Number “1204240438” Leading “6” dropped
49596 5 Read STR Modbus Module Serial Number “111317”
49601 1 Read UINT Manufacture Code 0x0032
49602 2 Read UINT Module Version 0x30010004 Version 1.00.04
Device Identifi cation
Modbus Register Map

5
Signet 9900 Modbus Module
Write User Application Name
Register 49571
Maximum
20 Characters
Write 0 (zero) to Save
Register 490007
to Save User Device
Identifi cation
Registers
Write Location
Register 49586
Maximum
10 Characters
Write Tag Name
Register 49581
Maximum
10 Characters
Write Modbus Address
to Register 49001
Range 1 to 247
Default = 34
Set Termination Resistor
Register 49002
0 = Off , 1 = On
Default = 0
Set Parity
Register 49005
0 = No Parity
1 = Odd Parity
2 = Even Parity
Default = 2
Set baud Rate
Register 49004
0 = 1200, 1 = 2400
2 = 4800, 3 = 9600
4 = 19200, 5 = 38400
6 = 57600, 7 = 115200
Default = 4
Write Modbus Address
to Register 49007 to save
communication settings.
Recycle Power to the Modbus
Module to activate the new
communication settings.
Set Modbus Mode
Register 49003
0 = RTU, 1 = ASCII
Default = 0
Programming Map
End
End
Set Endian
Register 49006
0 = Big Endian
1 = Little Endian
Default = 1
Note:
If RTU is selected
Data Bits = 8 and Stop Bits = 1
If ASCII Mode is selected
Data Bits = 7 and Stop Bits = 2
Communication Settings Programming User Tag Programming

6Signet 9900 Modbus Module
Status Register
Registers 40001 – 40002
Register.Bit Description
40001.0 Sensor reading is Good, no errors
40001.1 Wrong Sensor Connected
40001.2 Check Sensor
40001.3 Missing Sensor
40001.4 Sensor Error
40001.5 Secondary Reading is Totalizer
40001.6 Secondary Reading not Available
40001.7 Reset to Default Jumper Active
40001.8 9900 Communication Active
40001.9 Manufacturing Area Protected
40001.10 Device using Default Communication Parameters
40001.11 – 40002.15 Not Used
Readings / Sensors
Instrument Type Measurement Type
Reg 40007
Primary
Reg 40003
Secondary
Reg 40005
Factory 10x0000 NA NA
Flow 0x4201 Flow Totalizer 2
pH 0x5102 pH Temperature
ORP 0x5103 ORP Raw mV
Cond/Res 0x5704 Cond/Res Temperature
Pressure 0x4105 Pressure NA
Level/Volume 0x5C06 Level Volume
Temperature 0x4007 Temperature NA
4 to 20 mA Input 0x0008 Scaled Input Raw mA
Salinity 0x5A09 Salinity Temperature
Dissolved Oxygen 0x510B Dissolved Oxygen Temperature
Batch No Modbus Operation in Batch Mode
1. Factory and Batch Instrument types do not update the Primary or Secondary readings.
2. Secondary readings for fl ow are only available in 9900 Generation 4 or greater transmitters.
In Generation 4 transmitters the user can set the secondary reading to be either the permanent
or resettable Totalizer.
Programming Map
Format (Byte Orders)
Floats
Register Data Bytes
IEEE754 Float 0x570A4318
Result 152.34
49006 0 Big Endian
40003 0x570A C D
40004 0x4318 A B
49006 1 Little Endian
40003 0x4318 A B
40004 0x570A C D

7
Signet 9900 Modbus Module
Unit of Measure Code Description
Flow (Primary)
GPS 22 Gallons per Second
GPM 16 Gallons per Minute
GPH 136 Gallons per Hour
GPD 235 Gallon per Day
LPS 24 Liters per Second
LPM 17 Liters per Minute
LPH 138 Liters per Hour
M3/M 131 Cubic Meters per Minute
M3/H 19 Cubic Meters per Hour
M3/D 29 Cubic Meters per Day
FT3/M 15 Cubic Feet per Minute
FT3/H 130 Cubic Feet per Hour
FT3/D 27 Cubic Feet per Day
MG/D 23 Million Gallons per Day
ML/D 25 Million Liters per Day
BPM 133 Barrels per Minute
BPH 134 242 Barrels per Hour
BPD 135 Barrels per Day
FT/S 20 Feet per Second
M/S 21 Meters per Second
All Others 252 All other fl ow units
Flow Totalization (Secondary)
All Units 240
pH (Primary)
pH 59 pH
pH Temperature (Secondary) Important Requires power cycle to update
Temperature C 32 Degrees Celsius
Temperature F 33 Degrees Fahrenheit
ORP (Primary and Secondary)
mV 36 Millivolts
Conductivity (Primary)
uS 67 microSiemens
mS 66 milliSiemens
PPM 139 Parts per Million
PPB 169 Parts per Billion
KOhms 163 Kilo Ohms
MOhms 170 Mega Ohms
Conductivity Temperature (Secondary)
Temperature C 32 Degrees Celsius
Temperature F 33 Degrees Fahrenheit
Pressure
PSI 6 Pounds per Square Inch
Bar 7 Bars
KPa 12 Kilopascals
Programming Map

Georg Fischer Signet LLC, 3401 Aero Jet Avenue, El Monte, CA 91731-2882 U.S.A. • Tel. [phone] • Fax [phone]
For Worldwide Sales and Service, visit our website: www.gfsignet.com • Or call (in the U.S.): [phone]
For the most up-to-date information, please refer to our website at www.gfsignet.com
3-9900.270.090 Rev 4 08/19 English © Georg Fischer Signet LLC 2019
Ordering Information
Part Number Code Description
3-9900.270-M1 159 200 120 Modbus Module with Wire Cable Assembly
3-9900.270-M2 159 200 121 Modbus Module with Terminal Block Assembly
3-9900.270-M3 159 200 122 Modbus Module with M12 Connector Assembly
3-9900.270-M4 159 200 128 Modbus Module with Wire Cable Assembly
3-9900.270-CB1 159 200 123 Replacement Wire Cable Assembly for M1
3-9900.270-CB2 159 200 124 Replacement Terminal Block Assembly for M2
3-9900.270-CB3 159 200 125 Replacement M12 Connector Assembly for M3
3-9900.270-CB4 159 200 129 Replacement Cable Assembly for M4
5541-5005 159 855 021 5 meter (16 ft) M12 cable
5541-5010 159 855 022 10 meter (32 ft) M12 cable
Unit of Measure Code Description
Level/Volume (Level)
FT 44 Feet
IN 47 Inches
M 45 Meters
CM 48 Centimeters
Level/Volume (Volume)
FT3 112 Cubic Feet
IN3 113 Cubic Inches
M3 43 Cubic Meters
CM3 240 Cubic Centimeters
GAL 40 Gallons
LIT 41 Liters
Lb 63 Pounds
KG 61 Kilograms
Temperature
C 32 Degrees Celsius
F 33 Degrees Fahrenheit
4 to 20 mA Input
Scaled Input 252 Scaled 4 – 20 mA Input
Raw mA 251 Raw 4 – 29 mA Input Current
Salinity (Primary)
PPT 244 Parts per Thousand
Salinity Temperature (Secondary) Important requires power cycle to update
C 32 Degrees Celsius
F 33 Degrees Fahrenheit
Dissolved Oxygen (Primary
PPM 139 Parts per Million
% SAT 57 Percent
TOR 13 Torr
Dissolved Oxygen
Temperature (Secondary)
C 32 Degrees Celsius
F 33 Degrees Fahrenheit
Programming Map