iSMA-B-LP Room Panel/Modbus
version 1.3
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4.3.6
PARITY_BIT (40020)
Each byte of data being transferred may have additional protection as a parity bit added
before stop bit (bits).
The method of calculating parity bit determines the below table:
Register value
Type of parity bit
0
None(def)
1
Odd (number of all ones in a byte is odd)
2
Even (number of all ones in a byte is even)
Table 8 Parity bit
Figure 12 Modbus message frame
4.3.7
RESPONSE_DELAY_TIME (40021)
The value of this 16-bit register determines the number of milliseconds to wait before the
unit answers the question. This time is used to extend the interval between the question
and the answer.
The default value of 0 means no delay (the answer is sent once during the 3.5 character
required by the protocol Modbus RTU).
4.3.8
PANEL_ADDRESS (40023)
This register contains information about the Modbus address of the Room Panel.
Default address is 1.
4.3.9
PROTOCOL (40024)
The register is responsible for protocol selection. Protocol is determined according to the
register value as shown in the following table:
Value
Action
0
Modbus RTU(def)
1
Modbus ASCII
2
BACnet MS/TP
Table 9 Protocol selectio
