Extension for Modbus RTU (additional board)
Discovery Board DK-NP5-4A is equipped with an additional board for communication via Modbus RTU (RS485).
Dimensioned drawings – Modbus RTU additional board
Dimensions are in [mm].
Hardware overview – Modbus RTU additional board
| Name | Function | Note |
|---|---|---|
| X2 | Modbus RTU IN | |
| X3 | Modbus RTU OUT | |
| X4 | Connection to Discovery Board NP5 | |
| SW1 | Reserved | |
| SW2 | Reserved | |
| SW3 | Switch for 150 Ω termination resistor | |
| Pin 1 | 150 Ω termination resistor (switch set to ON) | |
| Pin 2 | Reserved |
| PIN | Function | Note |
|---|---|---|
| 1 | n.c. | |
| 2 | n.c. | |
| 3 | n.c. | |
| 4 | D1 (RS-485 +) | |
| 5 | D0 (RS-485 -) | |
| 6 | n.c. | |
| 7 | n.c. | PIN 7 on X2 is internally connected to PIN 7 on X3 |
| 8 | Common | Common signal and supply |