Connectors and Controls
- Each Bus Probe has a detachable terminal block with four terminals: ground (GND), power (+V), as well as the RS485+ and RS485– lines of the RS485 signal pair.
- BP#05 has an additional detachable terminal block with two terminals for connecting its companion sensor cable.
- BP#06 has an additional detachable terminal block with two terminals for connecting other devices. As BP#06 is a unidirectional digital input (DI), polarity must be observed when connecting other devices. While the wrong polarity will not damage BP#06 because it is protected, the correct polarity is required to detect signal levels correctly. For more details, see the input current diagram in Ordering Info and Specifications.
- By default, the RS485 port operates at 38,400-8-N-1.
- Starting from firmware version V1.02, the baudrate is user-configurable.
- Starting from firmware version V1.06, the parity is user-configurable.
- If two stop bits are required, the parity can be set to the mark mode, which is equivalent to 8-N-2 (8 bits of data, no parity, and two stop bits).
- The MD button* has two uses:
- Enabling writes into protected Modbus registers of Bus Probes
- Entering the firmware update mode of the Monitor/Loader
- Status LEDs display a number of device states and errors.
- Mounting holes can be used to attach Bus Probes to flat surfaces.
Notes:
- When using an RS485 bus of substantial length, do not forget to add 120Ω termination resistors on both ends of the bus.
- When viewed from the "top" (as in the diagram), BP#06's positive terminal is on the left and the negative terminal is on the right.
* Each Bus Probe comes with a metal pin that makes pushing and holding down the MD button easier.