Fuji Electric FRENIC-HVAC User Manual page 586

Communications error processing (y02 for port 1 and y12 for port 2)

y02 or y12 specifies the error processing to be performed if an RS-485 communications error
occurs.
RS-485 communications errors include logical errors (e.g., address error, parity error,
framing error), transmission protocol error, and physical errors (e.g., no-response error
specified by y08 and y18). The inverter can recognize such an error only when it is
configured with a run or frequency command sourced through the RS-485 communications
link and it is running.
Data
for y02, y12
Immediately trip, displaying an RS-485 communications error (Er8 for y02
0
and ErP for y12). (The inverter stops with alarm issue.)
Run during the period specified by the error processing timer (y03, y13),
1 display an RS-485 communications error (Er8 for y02 and ErP for y12), and
then stop operation. (The inverter stops with alarm issue.)
Retry communication during the period specified by the error processing timer
(y03, y13). If a communications link is recovered, continue operation.
2
Otherwise, display an RS-485 communications error (Er8 for y02 and ErP for
y12) and stop operation. (The inverter stops with alarm issue.)
3 Continue to run even when a communications error occurs.
 For details, refer to the RS-485 Communication User's Manual.
Timer (y03 for port 1 and y13 for port 2)

y03 or y13 specifies an error processing timer.
If the specified timer count has elapsed due to no response from the other end when a query
has been issued, the inverter interprets it as an error occurrence. See the "No-response error
detection time (y08, y18)" given on the next page.
- Data setting range: 0.0 to 60.0 (s)
Baud rate (y04 for port 1 and y14 for port 2)

y04 or y14 specifies the transmission speed
for RS-485 communication.
For FRENIC Loader (via the RS-485
communications link), specify the
transmission speed that matches the
connected computer.
* "6: 76800" is available at ROM version
later. But, note that it can be used for BACnet
protocol. If it is set to 5 under other protocol, actual
baud rate will be limited to 38400 bps.
Data length (y05 for port 1 and y15 for port 2)

y05 or y15 specifies the character length for
RS-485 communication.
For FRENIC Loader (via the RS-485
communications link), no setting is required
since Loader automatically sets 8 bits. (The
same applies to the Modbus RTU protocol.)
Function
Data for
y04 and y14
0
1
2
3
2450 or
4
6
Data for
y05 and y15
0
1
6-276
Transmission speed (bps)
2400
4800
9600
19200
38400
76800
(Only for BACnet)
Data length
8 bits
7 bits