Network Router User Manual

Table Of Contents

20 ProLink

II Software for Micro Motion

Transmitters

Installation and Setup

Figure 2-6 HART/RS-485 connection to transmitter or multidrop network

Method 6: Modbus/RS-485 temporary or hard-wired connection to RS-485 multidrop network

Note: This method is supported by RFT9739 transmitters, by Model 1500/2500 transmitters, by Model

1700/2700 transmitters with the analog outputs option board, and by Series 3000 transmitters.

Using a Black Box signal converter, the PC can be connected directly to a transmitter’s RS-485

terminals, to the output wires from these terminals, or to any point on an RS-485 network. Figure 2-7

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. Attach the other end of the signal converter leads:

• To any point on the network (hard-wired connection). Ensure that the positive and negative

wires are connected as shown in Table 2-9.

• Directly to the RS-485 terminals on your transmitter (temporary connection). See

Table 2-10.

• To the output wires from the RS-485 terminals on your transmitter (hard-wired

connection). See Table 2-10.

For assistance in identifying the RS-485 terminals, see Appendix A.

DCS or

PLC

See Step 5

BLACK

BOX

25-pin to 9-pin serial port adapter

(if necessary) (not shown)

RS-485 terminals

See Step 4

Transmitter