48
Wall mount Signal Tower Instruction Manual
8. Operation
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By sending commands from a Modbus/TCP supported master device, you can do things like control this product or
get its status.
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You can use communication port numbers 502, and 1024 to 65535.
Point
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Set up Modbus/TCP settings in the Modbus/TCP Setup. For information, refer to "7.7. Setting up Modbus/TCP" (
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Using Modbus/TCP, the total number of units that can be connected simultaneously is 8.
Modbus/TCP Data Structure
Transaction ID
Protocol ID
Field Length
Unit ID
Function Code
Data
2 bytes
2 bytes
2 bytes
1 byte
1 byte
n bytes
Area Name
Description
Transaction ID
0000H to FFFFH
Protocol ID
0000H Fixed
Field Length
Number of bytes following Unit ID
Unit ID
00H to FFH
Function Code
Code that identifies the function defined in Modbus
Data
Data string defined for each function code
8.2.1. Function Code
The following function codes are supported by this product.
Code
(Hex)
Function Name
Description
03H
Read Holding Registers
Gets the current state of the Signal Tower and buzzer.
06H
Write Single Register
Changes 1 data in the Data Address Register, and controls the Signal Tower and
buzzer.
08H
Diagnostics
Gets the power status of this product.
10H
Write Multiple Registers
Changes multiple data in the Data Address Register, and controls the Signal
Tower and buzzer.
8.2.
Modbus/TCP
