Hach sc1000 - Manual (Page 36)

34
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 .
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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)