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24 ProLink
®
II Software for Micro Motion
®
Transmitters
Installation and Setup
Method 9: Modbus/RS-485 temporary connection to MVD Direct Connect
Using a Black Box signal converter, the PC can be connected directly to the RS-485 terminals on the
core processor or the MVD Direct Connect I.S. barrier.
1. At the PC, attach the Black Box signal converter to the PC’s serial or USB port, using a 25-pin
to 9-pin adapter if necessary.
2. If connecting to the core processor, remove the lid.
3. Connect the signal converter leads to the RS-485 terminals. See Table 2-12, and:
• For connecting to the standard core processor, see Figure 2-10.
• For connecting to the enhanced core processor, see Figure 2-11.
• For connecting to the I.S. barrier, see Figure 2-12.
Note: The Modbus protocol allows only one Modbus master to be active on the network at any given
time. If you are connecting through a network, ensure that no other Modbus master devices are
currently active.
Note: Before using ProLink II to communicate with the core processor, disconnect any wiring to a
remote PLC. Be careful not to disconnect the power supply wiring. After using ProLink II to
communicate with the core processor, reconnect the wiring to the remote PLC.
Figure 2-10 Modbus/RS-485 connection to RS-485 terminals on standard core processor
Table 2-12 Lead-to-terminal assignments – Method 9
Device
Terminals
RS-485/A RS-485/B
I.S. barrier
(1)
(1) Connection is intrinsically safe.
13 14
Core processor
(2)
(2) Connection is not intrinsically safe.
34
Core processor
RS-485 to RS-232
signal converter
25 to 9 pin serial port
adapter (if necessary)
RS-485/B
RS-485/A