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Installation
3.6.4 Modbus card connections
Modbus RS485 (YAB021) and Modbus RS232 (YAB047) are available. For more detailed
information refer to the bus system manual.
To make a Modbus card connection:
1. Remove power from the instrument. Remove the probe module cover.
2. Connect the Modbus card to the appropriate slot (Figure 18). Use a magnetic
screwdriver to secure the four screws to the card.
3. Install the card connector to the appropriate connection on the main circuit board
(Figure 17).
4. Feed the cable through the base of the module and properly prepare and insert each
wire into the terminal according to Figure 24/Table 7 and Figure 25/Table 8.
5. Write the serial number from the rating plate on the supplied sticker and attach it to the
main high voltage barrier (Figure 18).
6. Install the probe module cover.
After installation and connection of a plug-in expansion card, the card must be configured
to the system. For Modbus card setup instructions, refer to section 6.3.4.2 on page 111.
)
Figure 24 Modbus RS485 (YAB021) card connections
1 Card (Reverse side) 3 Jumper 1&2 unplugged for full duplex (4-wire)
2 Jumper 1&2 plugged for half duplex (2-wire) 4 Terminal block (Refer to Table 7 for terminal
assignments)
Table 7 Modbus RS485 card (YAB021) terminal assignments
Terminal Modbus RS485 designation with 4 wires Modbus RS485 designation with 2 wires
1 Not Used Not Used
2 Not Used Not Used
3 Output – –
4 Output + +
5 Input – –
6 Input + +
7 Shield (connected to Protective Earth) Shield (connected to Protective Earth)