Hach-lange SC 100 User Manual download pdf (Page 49)

Appendix A Modbus Protocol

A.1 Modbus Troubleshooting

A.2 sc100 Modbus Registers

Table 8: Troubleshooting

Problem Possible Causes Solution

No Modus Response

Baud rate, or stop bits does not match

settings of Modbus master

Verify sc100 settings match the Modbus master

settings.Verify Modbus master Parity setting is set to

None.

Bad RS232 or RS485 cable Replace/Repair cable

No or improper network biasing and

termination.

Check all network devices for termination or biasing

settings. Only the ends of the network should have

termination turned on and only one point on the network

should be providing biasing.

Slave Address incorrect or duplicate

address of another bus device.

Verify all addresses are unique and between 1 and 247.

Modbus Exception Response

Data Type incorrect

Verify the requested register(s) Data Type matches the

Modbus Master Request e.g. do not access a Slave Float

value with a 2 byte Integer request. When requesting a

Float (2 registers/4 bytes), both registers must be

requested at the same time.

Table 9: sc100 Modbus Registers

Group Name Tag Name Register # Data Type Length R/W Description

Measurements

Calculated

Value

40001 Float 2 R

Value calculated from two sensor

measurements

Setup Language 40003

Unsigned

Integer

1 R/W Current System Language

Setup Date Format 40004

Unsigned

Integer

1R/W

Current Data Display Format

(0 = DD/MM/YY; 1 = MM/DD/YY;

2 = DD-MM-YY; 3 = MM-DD-YY)

Setup

Error Hold

Mode

40005

Unsigned

Integer

1R/W

Error Mode Hold State (0 = Hold outputs;

1 = Transfer outputs to predefined value)

Setup/Analog Output 1 Source 40006

Unsigned

Integer

1R/W

Selects data source for this output

(0 = None; 2 = sensor; 4 = Calculation)

Setup/Analog Output 1 Sensor Select 40007

Unsigned

Integer

1R/W

Selects sensor source when Source =

Sensor (0 = sensor1; 1 = sensor2)

Setup/Analog Output 1

Measurement

Select

40008

Unsigned

Integer

1R/W

Selects measurement on the sensor

(0 = Meas1.. 3 = Meas4)

Setup/Analog Output 1 Type 40009

Unsigned

Integer

1R/W

Selects output type

(0 = Linear output; 1 = PID control)

Setup/Analog Output 1 Transfer Value 40010 Float 2 R/W Sets the transfer value

Setup/Analog Output 1 Filter 40012

Unsigned

Integer

1R/W

Sets the output filter value in seconds

(0 to 120 sec.)

Setup/Analog Output 1

0mA - 4mA

Select

40013

Unsigned

Integer

1R/W

Selects 0mA/4mA for min output

(0 = 0mA; 1 = 4mA)

Setup/Analog Output

1/Linear

Min Setting 40014 Float 2 R/W Sets the min output value

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 57 58

Comments to this Manuals

jj 08 May 2025 | 14:13:07

Hach-lange SC 100 User Manual Page 49

Comments to this Manuals

Related products and manuals for Equipment Hach-lange SC 100