Mitsubishi Electric FR-F740 EC Instruction Manual page 462

Communication operation and setting
Fig. 6-171: Connecting the network bias resistors to the frequency inverter
BACnet reception status monitor (Pr. 52)
Set Pr. 52 = "81" to monitor BACnet communication status on the operation panel (FR-DU07)
and parameter unit (FR-PU04/FR-PU07).
Status
Idle
Automatic baud rate rec-
ognition
Not joined the network
Data to the own node
Data to the other node
Node separated
Error data
Tab. 6-97:
6 - 312
Other node
TXD
Data Description
0 Never had BACnet communication
During automatic baud rate recognition (Communication
1
error during automatic baud rate recognition is not counted)
2 Waiting for a token to the own node
10 Received a token to the own node
Received a supported request to the own node (including
11
broadcasting)
Received an unsupported request to the own node (includ-
12
ing broadcasting)
20 Received a token to other nodes
30 Separated from token passing after joined in it
90 Detected a communication error
Protocol error (LPDU, NPDU, APDU are not following the
91
format regulations.)
BACnet status monitor
RDA1 RDB1 RDA2 RDB2
RXD
(RXD1+) (RXD1-) (RXD2+) (RXD2-)
SDA1 SDB1 SDA2 SDB2
(TXD1+) (TXD1-) (TXD2+) (TXD2-)
P5S SG P5S SG
VCC
(VCC) (GND) (VCC) (GND)
Connect two 510 Ω (1/4W) resistor.
Parameter
I002037E
LF signal
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON