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22 ProLink
®
II Software for Micro Motion
®
Transmitters
Installation and Setup
Method 7: Modbus/RS-485 temporary connection to service port
Note: This method is supported by all Series 1000, Series 2000 and Series 3000 transmitters.
Using a Black Box signal converter, the PC can be connected directly to a transmitter’s service port.
Figure 2-8 shows the wiring for this connection type.
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. At the transmitter, connect the signal converter leads to the service port terminals. See
Table 2-11. For assistance in identifying the terminals, see Appendix A.
• If you are connecting to a Model 1700/2700 or to a Model 2400S transmitter, the service
port terminals are available at any time.
• If you are connecting to a Model 1500/2500 transmitter or a Series 3000 transmitter, the
RS-485 terminals on these transmitters are accessible as a service port for a 10-second
interval after power-up:
- If a service port connection is made during this interval, the port will remain in service
port mode indefinitely until power is cycled.
- If no service port connection is made during this interval, the terminals switch to
Modbus/RS-485 mode, and must be accessed using the RS-485 communication
settings configured in the transmitter (see Method 6).
Service port connections to these transmitters are discussed in detail in Section 2.2.6.
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: All service ports are accessed using the default address of 111. If you are connecting over a
multidrop network with multiple service ports, it is not possible to specify which device to connect to.
Figure 2-8 Modbus/RS-485 connection to the service port
BLACK
BOX
25-pin to 9-pin serial port adapter
(if necessary) (not shown)
Service port terminals
See Step 2
Transmitter