9. Interface Configuration
GTD-3000Ex
Instruction Manual
9.1. MODBUS RS485
TYPE
ADDRESS
BITS
DESCRIPTION
Measured Gas
Concentration
30001
BIT15~0
Gas Measurement (Integer/Decimal point is not considered)
High Scale Setting
30002
BIT15~0
High Scale Setting (Integer/Decimal point is not considered)
Alarm 1 Setting
30003
BIT15~0
Alarm 1 Setting (Integer/Decimal point is not considered)
Alarm 2 Setting
30004
BIT15~0
Alarm 2 Setting (Integer/Decimal point is not considered)
Gas detector status
value
10000
BIT0
Alarm 1 Active Status
BIT1
Alarm 2 Active Status
BIT2
Fault Active Status
BIT3
Maintenance Mode Status
BIT4
Test Mode Status
BIT5
Calibration Mode Status
BIT6
Reserved
BIT7
Toggle Bit (Bit reversal in 2 sec interval)
External Test
3
BIT0~7
Gas Detector Test Mode Setting
External Reset
2
BIT0~7
Exit Gas Detector Test Mode
9.1.1. Interface setting
9.1.2. MODBUS RS485 Register map
■ Data Format: RTU
■ Baud rate: 9600 bps
■ Data bits: 8bits
■ Stop bit: 1bits
■ Parity: Even
■ For details, please go to www. modbus.org
[Table 13. RS485 MODBUS Address Configuration]
