6.13 Modbus communications: Cannot
communicate using Modbus
®
RTU
Recommended actions
1. Verify the use of RS-485.
2. Verify wiring connections.
3. Verify if termination or a pull up is required.
a) Verify that Modbus serial communications settings in the Gateway
match the Modbus Host settings.
b) Log on to the Gateway and navigate to SETUP → MODBUS →
COMMUNICATIONS.
4. Verify the Modbus address for the Gateway.
5. Verify Modbus register mapping in the Gateway.
a) Log on to the Gateway and navigate to SETUP → MODBUS → MAPPING.
6.14 Modbus communications: Cannot
communicate using Modbus
®
TCP
Possible cause: Incorrect settings
Recommended actions
1. Verify secure/unsecure Modbus protocol settings in the Gateway.
a) Log on to the Gateway.
b) Navigate to SETUP → SECURITY → PROTOCOLS.
2. Verify the Modbus TCP communications settings in the Gateway.
a) Log on to the Gateway.
b) Navigate to SETUP → MODBUS → COMMUNICATIONS.
3. Verify Modbus register mapping in the Gateway.
a) Log on to the Gateway.
b) Navigate to SETUP → MODBUS → MAPPING.
6.15 Modbus communications: Cannot
communicate using secure Modbus
®
TCP
Reference Manual Troubleshooting
00809-0200-4410 September 2020
Emerson.com/Rosemount 49
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