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INSTALLATION GUIDE
MODULAR SUNWAY TG
TE OD
Rev. 03
– 01/06/2018
79/
139
•
A MASTER port for the connection between the isolation board and the external devices
The INVERTER port terminators must not be modified in respect to the factory setting.
The MASTER ports are as follows:
DIP-switch
Function
Factory setting
Notes
SW1-1, SW1-2
MASTER
Port Terminators
Master side RS485
terminator
Both ON:
terminators enabled
ON: 150 Ω resistor between A (D1)
and B (D0), 430 Ω resistor between A
(D1) and +5 VE, 430 Ω resistor
between B (D0) and 0 VE.
OFF: no termination and polarization
resistor.
Table 22: SW1 and SW2 termination DIP-switches on RS-485 galvanic isolation board
NOTE
Incorrect setting of the terminators in a multidrop line may inhibit communication and lead to
communication difficulties particularly at high baud rates. If more than the two prescribed
terminators have been installed on a line some drivers may enter protection mode for thermal
overload thus blocking the communication of some devices.
To access the SW1 DIP-switch remove the front protective cover from the RS-485 galvanic isolation board
(see section 6.6.1).
Figure 47: Location of the SW1 termination DIP-switches
The factory setting of the DIP-switch is indicated in the following figure.