Powtran PI160 Series User Manual

Appendix I
123
Appendix I
RS232 to RS485 converter
T+
T-
485-
485+
485-
485+
485-
485+
1#
2#
8#
485-
485+
5#
Frequency
inverter
Frequency
inverter
Frequency
inverter
Frequency
inverter
Figure I-5:Multiple applications schematic Figure 2
It is better to use shield cable for the multiple application. And make the basic parameters
such as baud rate and data validation connecting with RS485 consistent , do not use one address
repeatedly.
U
V
W
T
S
R
485-
485+
GND
I-1-3 Protocol description
PI160 series inverter communication protocol is a asynchronous serial master-slave
communication protocol, in the network, only one equipment (Master) can build a protocol (known
as “Inquiry/Command”) . Other equipment (Slave) only can response the "Inquiry/Command"of
master by providing data or perform the corresponding action according to
the"Inquiry/Command"of master. Here, the master refers to a Personnel Computer (PC), an
industrial control device or a programmable logic controller (PLC),etc. and the slave refers to
PI160 inverter. Master can communicate with individual slave, also send broadcasting information
to all the lower slaves. For the single "Inquiry/Command"of master, slave will return a signal (that
is a response) to master; for the broadcasting information sent by master, slave does not need to
feedback a response to master.
PI160 series inverter’s Modbus protocol communication data format is as follows: in RTU
mode, messages are sent at a silent interval of at least 3.5 characters. There are diverse character
intervals under network baud rate,which is easiest implemented (as shown in Figure T1-T2-T3-
T4) .The first field transmitted is the device address.

Powtran PI160 Series Specifications

General

Brand	Powtran
Model	PI160 Series
Category	Inverter
Language	English