Riken Keiki 70D Series, Communication Function Manual

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3. Modbus/TCP Communication Functions 3-1. Communication specifications
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3
Modbus/TCP
Communication Functions
3-1. Communication specifications
Protocol Modbus/TCP
Communication mode
RTU
Port No. 502 port
Corresponding function Read Holding Register (0x03)
Preset Multiple Registers (0x10)
Number of simultaneous connections 8
General specifications for Modbus/TCP are not included in the scope of this manual. See the specifications
for Modbus/TCP. (http://www.modbus.org/)
3-2. Register map
The register map of GD-70D-EA Modbus/TCP is described below.
Address
Writability

: Yes

: No
Item Description
40001

Status
bit0-3: Mode (0: Initial 1: Measuring mode 3: Inhibit 5: Test mode)
bit5: Fault flag
bit6: Alarm: 1st flag
bit7: Alarm: 2nd flag
bit8: Alarm: 1st alarm relay contact flag
bit9: Alarm: 2nd alarm relay contact flag
bit10: Fault relay contact flag
bit11: Repeat 0 and 1 every two seconds
40002

(Reserved)
40003

Concentration value
Floating decimal point
Address 40003: Lower 16 bits
Address 40004: Upper 16 bits
40004

40005

Concentration value
Signed integer
Value obtained by rounding off the concentration value to the nearest
whole number
40006

(Reserved)
40007

Concentration unit
bit0-2: Decimal point code (000:1/1 001:1/10 010:1/100 011:1/1000)
bit8-11: Unit code (0001: ppm 0010: ppb 0100: vol% 1000: %LEL)