TN259

Updating Your Application from the RCM3305/RCM3315 to the RCM3309/RCM3319

Introduction

Rabbit is changing our product offerings to respond to both market requirements and the components available to us.

We can no longer obtain certain components for the RCM3305/RCM3315 RabbitCore modules that support the originally specified -40°C to +70°C temperature range. Instead of changing the design of the RCM3305/RCM3315 RabbitCore modules to handle available components specified for the original temperature range, we decided to develop a new product line — the RCM3309/RCM3319 — based on the RCM3900/RCM3910 RabbitCore modules that were released for the same reason.

We are introducing the RCM3309/RCM3319 RabbitCore modules in June, 2008. These new modules are identical in form, dimensions, and function to the RCM3305/3315 modules. We strongly recommend that existing RCM3305/3315 customers and designers of new systems consider using the new RCM3309/RCM3319 RabbitCore modules.

This Technical Note compares the two series of RabbitCore modules, and provides complete information on how to port your application developed for the RCM3305/RCM3315 to the equivalent RCM3309/RCM3319 RabbitCore modules.

Comparing the RCM3305/RCM3315 and the RCM3309/RCM3319

Temperature Specifications

RCM3305/RCM3315 RabbitCore modules manufactured after May, 2008, are specified to operate at 0°C to +70°C. The RCM3309/RCM3319, rated for -40°C to +85°C, are available starting in June, 2008.

Ethernet Chip

A different Ethernet controller chip is used on the RCM3309/RCM3319. The Ethernet chip is able to detect automatically whether a crossover cable or a straight-through cable is being used in a particular setup, and will configure the signals on the Ethernet jack interface.

Maximum Current

The RCM3305/RCM3315 draws 250 mA vs. the 325 mA required by the RCM3309/RCM3319.

LEDs

The SPEED and user (USR/BSY) LED locations have been swapped between the RCM3305/RCM3315 and the RCM3309/RCM3319, the LNK/ACT LEDs have been combined to one LED on the RCM3309/RCM3319, and the RCM3309/RCM3319 has an FDX/COL LED instead of the SF LED on the RCM3305/RCM3315. The SF LED on the RCM3305/RCM3315 blinks when data are being written to or read from the serial flash. The FDX/COL LED on the RCM3309/RCM3319 indicates whether the Ethernet connection is in full-duplex mode (steady on) or that a half-duplex connection is experiencing collisions (blinks).

NOTE	The change in LED indicators means that there is no indication on the RCM3309/RCM3319 when data are being written to or read from the serial flash.

Figure 1 compares the RCM3305/RCM3315 and the RCM3309/RCM3319 component layouts. The LED placements on the boards remain unchanged.

Figure 1. RCM3305/RCM3315 and RCM3309/RCM3319 LED Layouts

Dynamic C

As long as no low-level FAT file system calls were used in your application developed for the RCM3305/RCM3315, you may run that application on the RCM3309/RCM3319 after you recompile it using Dynamic C v. 9.60.

Dynamic C v. 9.60 now has many of the previously optional modules included in the standard release. Table 1 compares the Dynamic C features available for the two series of RabbitCore modules.

Table 1. Comparison of Dynamic C Resources

Dynamic C	RCM3305/RCM3315	RCM3309/RCM3319
Standard Release	v. 9.25	v. 9.60
Optional Modules (purchased separately)	FAT File System RabbitWeb Point-to-Point Protocol (PPP) Simple Network Management Protocol (SNMP) µC/OS-II Real-Time Kernel Library Encryption Executable Modbus TCP	Included in Standard Release
Optional Security Modules (purchased separately)	Advanced Encryption Standard (AES) Secure Sockets Layer (SSL)	Rabbit Embedded Security Pack
Other Optional Modules (available separately)	Rabbit Field Utility source code One-Year Telephone Technical Support Subscription	Rabbit Field Utility source code One-Year Telephone Technical Support Subscription

Summary

Table 2 summarizes the features for the two series of RabbitCore modules.

Table 2. Feature Comparison

Parameter	RCM3305	RCM3315	RCM3309	RCM3319
SRAM	512K program (fast SRAM) + 512K data		512K program (fast SRAM) + 512K data
Flash Memory (program)	512K		512K
Memory (data storage)	8MB (serial flash)	4MB (serial flash)	8MB (serial flash)	4MB (serial flash)
Operating Temperature	-40°C to +70°C (up to May, 2008) 0°C to +70°C (after May, 2008)		-40°C to +85°C
Board Size	1.850" × 2.725" × 0.86" (47 mm × 69 mm × 22 mm)
Dynamic C	v. 9.25 (standard release)		v. 9.60 (standard release)