
Transmitter Configuration and Use: Series 1000 and 2000 Transmitters 19
Connecting with ProLink II Software continued
Using the Display Using the CommunicatorUsing ProLink IIBefore You Begin
3.5 Connecting from a PC to a Model 1500 or Model 2500 transmitter
ProLink II software can communicate with a Model 1500 or Model 2500 transmitter
using:
• Modbus/RS485 protocol (see Section 3.5.1
)
- Configurable connection
- SP (service port) standard connection
• A HART/Bell202 connection (see Section 3.5.2
)
Note: Service port connections use standard settings and do not require transmitter configuration.
Therefore, they are easy and convenient. However, service port connections are available only for the
10-second interval after power-up. See Step 5 in the following section.
Note: Due to the design of HART protocol, connections made using HART protocol are slower than
connections that use Modbus protocol. If you use HART protocol, you cannot open more than one
ProLink II window at a time.
3.5.1 Connecting to the RS-485 terminals or an RS-485 network
To connect a PC to the RS-485 terminals or an RS-485 network:
1. Attach the signal converter to the serial port of your PC, using a 25-pin to 9-pin adapter if
required.
2. To connect to the RS-485 terminals, connect the signal converter leads to terminals 33 and 34.
See Figure 3-7.
3. To connect to an RS-485 network, connect the signal converter leads to any point in the
network. See Figure 3-8.
4. For long-distance communication, or if noise from an external source interferes with the
signal, install 120 Ohm, 1/2 watt resistors in parallel with the output at both ends of the
communication segment.
Figure 3-7 RS-485 terminal connections to Model 1500 or 2500
• Model 1500 AN
• Model 2500 CIO
RS-485 B
RS-485 A
RS-485 to RS-232
signal converter
25-pin to 9-pin serial port
adapter (if necessary)
PC
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