Black Box MDR210A-485 manual Module Address, Data Validity

hop in a different sequence) the two modules will jump to separate channels on the next hop. Using networks, multiple module pairs can operate in the same vicinity with minimal interference from each other. The network parameter is user-definable using the MDR210A-485 Set-up Hop Table.

Module Address

Module Addresses provide another level of addressing among the MDR210A-485 modules. Each module in a network can be configured with a 16-bit Module Address to establish selective communications within a network. This address is set to 65535 values using the MDR210A-485 Set-up Hop Table command.

All modules with the same Module Address can transmit and receive data among themselves. Any modules on a network with different Module Addresses will still detect and listen to the data in order to maintain network synchronization. However, they will not send the data to their serial ports if their Module Addresses do not match the Module Addresses of the transmitter.

Data Validity

The first data packet transmitted contains all bytes that accumulated in the data buffer while the header (see Figure 2a below) was being sent. After the first data packet is sent, another header will be sent if data is available in the buffer. The header is followed by another data packet. The second data packet (and all subsequent data packets) will consist of data that accumulated in the buffer while the previous data packet and header were being sent (see Figure 2a). The size of each data packet can vary up to 64 bytes. This progression can be seen in Figure 2b.

Sent Data:

	Data		Data
Header	Packet 1	Header	Packet 2	Header
Collect
Data for	Collect Data for Packet 2		Collect Date for Packet 3
Packet 1

Group Data into Packets:

8