|No. 1698||SMG-5420 - No Signals via Modbus RTU||2019-11-12|
Dear Madams and Sirs,
I am trying to connect a SMG-5420 device to control unit via ModbusRTU (RS485). Seemingly, the SMG does not recognize any Signals on TX and RX. I am using the following configuration
Bd-rate: 9600 bps
Data bits: 8
Stop bits: 2
SMG working as TCP Server
Connection Timeout 60s
Query Flow: TCP to Serial
Slave ID 0
Response Time: 500 ms
Send Gateway Exception: Disable
When I try to access the Modbus via EzTerm (or similar tools) and try to send
15 04 00 02 00 01 93 1E
The connection is terminated.
Trying to emulate a Com-Port via ezVSP didn't either.
Is a 120 Ohm resistor necessary for proper signal termination? What might be the reason for the Modbus Connection problems?
|Writer||Benjamin Beck||Company||Nemak Wernigerode|