ElmoMC SimplIQ Digital Servo Drives-Cello Installation Guide - Manual (Page 50)

Cello Installation Guide Installation
MAN-CELIG (Ver. 1.602)
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50
3.4.9 Communication Cables
The communication cables use an 8-pin RJ-45 plug that connect to the RS-232 and CAN ports
on the “top” of the Cello.
The communication interface may differ according to the user’s hardware. The Cello can
communicate using the following options:
a. RS-232, full duplex
CAN
RS-232 communication requires a standard, commercial 3-core null-modem cable connected
from the Cello 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. The interface is electrically isolated by
optocouplers.
For ease of setup and diagnostics of CAN communication, RS-232 and CAN can be used
simultaneously.
3.4.9.1 RS-232 Communication
Notes for connecting the RS-232 communication cable:
Use a 26 or 28 AWG twisted pair shielded cable. The shield should have aluminum foil
covered by copper braid with a drain wire.
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.
The male RJ plug must have a shield cover.
Ensure that the shield of the cable is connected to the shield of the RJ plug. The drain
wire can be used to facilitate the connection.
Pin Signal Function Pin Locations
1, 2 N/A —
3 Tx RS-232 transmit
4 N/A —
5 COMRET Communication return
6 Rx RS-232 receive
7, 8 N/A —
Table 15: RS-232 Cable - Pin Assignments