Mitsubishi Electric FR-F820-00077 Instruction Manual page 680

(N) Operation via communication and its settings
Node with network bias resistors
● This product is a node with local bias resistors. Therefore at least one node must be a node with
network bias resistors in the network configuration.
● When configuring the network with only this products, refer to the following, and make the node
with network bias resistors. (When using two sets in one segment, insert them into both ends of
the network.)
Fig. 5-246:
BACnet reception status monitor (Pr. 52)
Set Pr. 52 = "81" to monitor the BACnet communication status on the operation panel.
Monitor
value
0
1
2
10
11
12
20
30
90
91
Tab. 5-262: BACnet status monitor
5 - 508
Other
node
P5S SG SDA1
(VCC) (GND) (TXD1+)
VCC GND + TXD
VCC GND + TXD
P5S SG SDA2
(VCC) (GND) (TXD2+)
Connecting the network bias resistors to the frequency inverter
Status
Idle
Automatic baud rate
recognition
Not joined the network
Data to the own node
Data to the other node
Node separated
Error data
SDB1 RDA1 RDB1
(TXD1-) (RXD1+) (RXD1-)
- + RXD -
- + RXD -
SDB2 RDA2 RDB2
(TXD2-) (RXD2+) (RXD2-)
Connect two 510 Ω (1/4W) resistor.
Description
Never had BACnet communication
Automatic baud rate recognition (
Communication error during automatic baud rate recognition
is not counted)
Waiting for a token to the own node
Received a token to the own node
Received a supported request to the own node (including
broadcasting)
Received an unsupported request to the own node (including
broadcasting)
Received a token to other nodes
Separated from token passing after joined in it
Detected a communication error
Protocol error
(LPDU, NPDU, APDU are not following the format regulations.)
Parameters
I003073E
LF signal
output
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON