Installation Guide Owner manual

DC Whistle Installation Guide Installation

MAN-DCWHIIG (Ver. 1.101)

www.elmomc.com

3.12. Communications

The communication cables use an 8-pin RJ-45 plug that connect to the RS-232 and CAN ports

on the DC Whistle.

The communication interface may differ according to the user’s hardware. The DC Whistle can

communicate using the following options:

• RS-232, full duplex

• CAN

RS-232 communication requires a standard, commercial 3-core null-modem cable connected

from the DC Whistle to a serial interface on the PC. The interface is selected and set up in the

Composer software.

In order to benefit from CAN communication, the user must have an understanding of the basic

programming and timing issues of a CAN network.

For ease of setup and diagnostics of CAN communication, RS-232 and CAN can be used

simultaneously.

3.12.1. RS-232 Communication

Notes for connecting the RS-232 communication cable:

1. Connect the shield to the ground of the host (PC). Usually, this connection is soldered

internally inside the connector at the PC end. You can use the drain wire to facilitate

connection.

2. The RS-232 communication port is non-isolated.

3. The male RJ plug must have a shield cover.

4. Ensure that the shield of the cable is connected to the shield of the RJ plug.

5. The drain wire can be used to facilitate the connection.

Pin Signal Function

1, 2 — —

3 Tx RS-232 transmit

4 — —

5 COMRET Communication return

6 Rx RS-232 receive

7, 8 — —

Body Drain Wire

shield

Pin Positions

Table 13: RS-232 Cable - Pin Assignments