Introduction
Append
ix
B
B–4
Serial Network
Parameter
Settings
Several parameter settings are necessary to configure serial communications, listed below.
For inverters on the same network, some settings must match from inverter to inverter. These
include: Baud rate, data bits, parity, and stop bits. However, the node address on each inverter
must be unique, used only once on the network.
Communication
Test Mode
Use the communication test mode to check the RS485 serial port hardware on the inverter. Use
the following procedure:
1.
Disconnect the wiring from the TM2 serial port terminal block on the inverter.
2.
Set parameter C071 = 02 (loopback test)
3.
Turn the inverter power OFF and then ON again to initiate the communication test.
4.
Check the pass/fail results according to the keypad display.
5.
Press the STOP/RESET key on the digital operator keypad (or the Reset button on the copy
unit) to switch to the normal setting display.
6.
Set parameter C071 to the desired setting for normal operation.
Function
Code
Item
Value
Description
C071
Baud rate
02
Loop-back test
03
2400 bps
04
4800 bps
05
9600 bps
06
19200 bps
C072
Node address
1 to 32,
FF
1 to 32 – Node or station address (unique
to each inverter or device)
FF – Automatic broadcast (to all nodes on
transmit, allowed only on certain
commands (refer to each command
description in this appendix)
C073
Data bits
07
7 bits
08
8 bits
C074
Parity
00
none
01
Even parity
02
Odd parity
C075
Stop bits
01
1 bit
02
2 bits
C078
Wait time
0 to 1000
0 to 1000 ms time that the inverter waits
to respond to network master
C079
Communication
protocol select
00
ASCII
01
ModBus RTU
Abnormal termination
Normal termination