KWE P
/N 3940
46 Ve
rsatronik
502 a
nd 502D
MODBUS G
atewa
y V1
.0 F
eb
2
014 Te
chni
ca
l i
nformation subj
ec
t to
ch
ange
w
ithout noti
ce
Overview:
Wiring
RS-485 Network
COM1 terminals A and B are used.
The A and B naming convention may differ across
manufacturers.
Refer to individual wiring/installation pages in this
manual.
A=(+) non-inverting
B=(—) inverting
Termination and Bias
This device does not have a termination
resistor installed
There are two 4.7kohm pull up/down
resistors located on the lines to maintain
bias.
LED Operation
LED2 will blink every time a Modbus request is
seen on the network
Modbus Information
Modbus Communication
Configuration Settings
The gateway is a Modbus slave and all
communication has to be initiated by a master.
To set up successful communication with the
gateway all connection parameters have to be
set correctly to the following: 9600 8-N-1 RTU.
Mode
RTU
Baud Rate
9600bps
Data Bits/Length
8
Parity None
Stop bits
1
Address/Device ID
88, 1-9
Trouble-Shooting
Problem: Not getting a response from the
gateway device
Ensure the connection is set to 9600 8-N-1
Check the rotary dial switch for the device
addressing and it not in between dial
settings
Ensure the communication cables match
their polarity