Data Transmission - SBC Saia PCD AWD1D5 Assembly And Operating Instructions Manual

Technical data S-Bus
Bus system
Transmission rate
Transmission mode
Bus length (max.)
Response time:
■ The communication is ready 30 s after the power on
■ The use of energy meter in bus with intensive communication could reduce the performance of the bus
■ Refresh time for the data is 5 s. For this reason one energy meter should be not polled faster as 5 s
■ 254 devices could be connected to the S-Bus. With more than 128 devices, a repeater should be used
■ The interface don't have a terminal resistor, this must be provided external
■ For a description of the used registers please look at the register page

Data transmission

■ Only «read/write» register instructions are recognized
■ Only one register can be written at the same time
■ The device will respond «NAK» if more than 1 register is written
■ Up to 10 registers could be read at the same time
■ The device will respond «NAK» if more than 10 registers are read
■ The device will not respond to any unknown query
■ The device has a voltage monitoring system. In case of voltage drop, registers are stored in EEPROM (transmission rate) etc.
Changing the S-Bus direct on device
■ In the menu, go for «U»
■ Push long (≥ 3 s) ➞ «ADR»
■ Push short ➞ S-Bus address +1, push long ➞ S-Bus address +10
■ If the desired address is reached, wait until the main display appears again.
S-Bus
4800-9600-19'200-38'400-57'600-115'200.
The transmission Baud rate is automatically detected
Data
1200 m (without repeater)
Write: up to 60 ms
Read: up to 60 ms
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