Hitachi SJ7002 Series Instruction Manual page 287

B–4
Introduction
Serial Network
Parameter
Settings
Communication
Test Mode
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Several parameter settings are necessary to configure serial communications, listed below.
Function
Item
Code
C071 Baud rate
C072 Node address
C073 Data bits
C074 Parity
C075 Stop bits
C078 Wait time
C079 Communication
protocol select
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.
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.
Normal termination
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.
Value Description
02 Loop-back test
03 2400 bps
04 4800 bps
05 9600 bps
06 19200 bps
1 to 32, 1 to 32 – Node or station address (unique
FF 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)
07 7 bits
08 8 bits
00 none
01 Even parity
02 Odd parity
01 1 bit
02 2 bits
0 to 1000 0 to 1000 ms time that the inverter waits
to respond to network master
00 ASCII
01 ModBus RTU
Abnormal termination