A&D AD-4408A Instruction Manual download pdf (Page 16)

5. Timing Chart

Slave Normal Operation

Slave normal operation is a signal to confirm that the AD-4408A is connected to the power

and is in normal operating conditions. During normal operation, the signal is reversed at a

0.5 to 1 second interval.

Slave normal operation

Fig.6 Slave normal operation signal

Error status flag

If an AD-4408A error has occurred, the slave ready bit will be turned OFF and the error

status flag will be turned ON to convey to the master device that an error has occurred.

The master device will turn the error reset flag ON to request resetting the error status

flag.

Fig.7 Resetting the error status flag

Table 8 Command bits / Status bits

Memory Description

First word of Holding Register Bit 4 Error reset flag

Bit 0 Slave normal operation

Bit 1 Slave ready

Fourth word of Input Register

Bit 2 Error status flag

0.5 to 1 sec

Slave read

Error status flag

Error reset flag

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 22

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A&D AD-4408A Instruction Manual Page 16