Emerson Process Management Connecting to a Model 2400S DN transmitter, Connection options

Connecting with ProLink II or Pocket ProLink Software

4.4Connecting to a Model 2400S DN transmitter

To connect to the Model 2400S DN transmitter using ProLink II or Pocket ProLink, you must use a service port connection.

4.4.1Connection options

The service port can be accessed via the service port clips or the IrDA port.

The service port clips have priority over the IrDA port:

•If there is an active connection via the service port clips, access via the IrDA port is disabled.

•If there is an active connection via the IrDA port and a connection attempt is made via the service port clips, the IrDA connection is terminated.

Additionally, access via the IrDA port may be disabled altogether. In this case, it is not available for connections at any time. By default, access via the IrDA port is disabled. See Section 8.10.6 for more information.

4.4.2Service port connection parameters

The service port uses default connection parameters. Both ProLink II and Pocket ProLink automatically use these default parameters when Protocol is set to Service Port.

Additionally, to minimize configuration requirements, the service port employs an auto-detection scheme when responding to connection requests. The service port will accept all connection requests within the limits described in Table 4-1.If you are connecting to the service port from another tool, ensure that configuration parameters are set within these limits.

Table 4-1Service port auto-detection limits

Parameter	Option
Protocol	Modbus ASCII or Modbus RTU(1)
Address	Responds to both:
	• Service port address (111)
	• Configured Modbus address (default=1)(2)
Baud rate(3)	Standard rates between 1200 and 38,400
Stop bits	1, 2
Parity	Even, odd, none

(1)Service port support for Modbus ASCII may be disabled. See Section 8.10.5.

(2)See Section 8.10.4 for information on configuring the Modbus address.

(3)This is the baud rate between the service port and the connecting program. It is not the DeviceNet baud rate.

4.4.3Connecting via the service port clips

To connect to the service port via the service port clips:

1.Attach the signal converter to the serial or USB port of your PC, using the appropriate connectors or adapters (e.g., a 25-pin to 9-pin adapter or a USB connector).

2.Remove the transmitter housing cover from the transmitter (see Section 3.3), then connect the signal converter leads to the service port clips. See Figure 4-1.

18 Micro Motion® Model 2400S Transmitters for DeviceNet™