SFSL5.5MDB YAMAR [Yamar Electronics Ltd.], SFSL5.5MDB Datasheet - Page 9

• Manufacturer Part Number: SFSL5.5MDB
• Description: Smart Slave for DC-BUS Powerline Network
• Manufacturer: YAMAR [Yamar Electronics Ltd.]

Command type 2: Read command.
The Read command, initiated by the Master, requests the status of the SIG61 input pins.
The Read command from the master consists of 3 bytes: sync break, sync field and identifier. The
identifier of this command begins with the four-bit ID of the device, followed by “01”, and finally 2
protection bits. The two protection bits are calculated as described above.
If header detection is correct (including protection bits), the SIG61 device (whose ID matches the one in
the command) shall respond by sending two bytes. A data byte containing the status of its eight input
Signal pins followed by a checksum byte. The checksum calculation is carried out as in the description
above while part of it, the identifier byte, was transmitted by the Master. Figure 4.2 shows a generic
Read command.
Command type 3: Read-change
The Read-change command is similar to the Read command. However, it enables to detect any change
in the input pins (pulse-like behavior) that may have occurred between two consecutive Read or Read-
change commands. The command from the master instructs the SIG61 to send back information on
changes of its input pins since the last Read or Read-change command. The first change on the pin
after the Read command sets its bit value.
Figure 4.3 shows the process of determining the sent bit value of an input pin.
The identifier begins with the destination device four-bit ID, followed by 10 and terminating with 2
protection bits. The response for this command is a data byte containing the SIG61`s input pins recent
changed value, followed by the checksum byte. See checksum and protection bits calculation
description above. Figure 4.4 shows a Read-changes command.
© 2010 Yamar Electronics Ltd.
Preliminary and proprietary Information of YAMAR Electronics Ltd. Subject to change without notice.
SIG61 Outputs at receiving device
The Read-change command from the master has 3 bytes: sync break, sync field and identifier.
Sync break
Sync break
Sent value
Input pin level
Read -change
command
Figure 4.3 - Determining the recent changed value of an input pin
Sync Field
Sync Field
Master
“0”
P1, P0, 0, 1, Address
Figure 4.1 - Write command
Figure 4.2 - Read command
Transmitted command
P1, P0, 0, 0, Address
“1”
Change
1 bit
9
Out [7:0]
Data (8 input bits)
“0”
Checksum
Slave
“1”
DS-SIG61 R0.932
Checksum
3 bit delay