Models FL3100/3101
39
8.7.11 Comm 1 Baud Rate
A read returns the Comm 1 baud rate of the FL3100, FL3101. A write changes
the baud rate to the requested baud rate. After the baud rate has been changed
to the addressed unit, the MODBUS communications will cease because the
baud rate has changed; therefore the master will have to change its baud rate to
the slave’s new baud rate in order to restart the communications.
Baud Rate
Low Data Byte
Access
19.2K
03
Read/Write
9600
02
Read/Write
4800
01
Read/Write
2400
00
Read/Write
This function is indicated on the Low Data Byte and the High Data Byte is not
used.
EXCEPTION - If an illegal data value is entered which is not listed above, then
the Exception Code 03 (Illegal Data Value) is returned.
EXCEPTION - If an EEPROM write occurs, then the Exception Code 04 (Slave
Device Failure) is returned.
NOTE - By grounding the RESET input during power-up cycle (approximately 10
seconds), the FL3100, FL3101 Baud Rate will default to 19.2K.
8.7.12 Comm 1 Data Format
A read returns the Comm 1 data format of the FL3100, FL3101. A write
changes the data format to the requested data format. After the data format has
been changed to the addressed unit, the MODBUS communications may cease
or start producing Comm errors because the data format has changed; therefore
the master will have to change its data format to the slave’s new data format in
order to restart or provide proper communications.
Data Parity Stop
Format Low Data Byte Access
8
None
1
8-N-1
00
Read/Write
8
Even
1
8-E-1
01
Read/Write
8
Odd
1
8-O-1
02
Read/Write
8
None
2
8-N-2
03
Read/Write
This function is indicated on the Low Data Byte and the High Data Byte is not
used.
NOTE - By grounding the RESET input during power-up cycle (approximately 10
seconds), the FL3100, FL3101 Data Format will default to 8-N-1.
8.7.13 UV Signal Count
A read indicates the number of UV Signal Counts that have occurred within 500
ms which is the time duration that is required to detect a fire in the UV spectrum.