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3.4.9 Communication Cables
The communication cables use an 8-pin RJ-45 plug that connect to the RS-232 and CANopen
ports on the front of the Tuba.
The communication interface may differ according to the user’s hardware. The Tuba can
communicate using the following options:
a. RS-232, full duplex
b. CANopen
RS-232 communication requires a standard, commercial 3-core null-modem cable connected
from the Tuba to a serial interface on the PC. The interface is selected and set up in the
Composer software.
In order to benefit from CANopen communication, the user must have an understanding of
the basic programming and timing issues of a CANopen network. The interface is electrically
isolated by optocouplers.
For ease of setup and diagnostics of CAN communication, RS-232 and CANopen can be used
simultaneously.
3.4.9.1 RS-232 Communication (on the COMM.1 Port)
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.
RS-232 (L)
Pin
RS-232 (R)
Pin
Signal
Function
Pin Location
1 1 — —
2 2 — —
3 3 Tx RS-232 transmit
4 4 — —
5 5 COMRET Communication return
6 6 Rx RS-232 receive
7 7 — —
8 8 — —
Table 3-13: RS-232 Cable - Pin Assignments
Tuba Installation Guide Installation
MAN-TUBIG (Ver. 1.3)
3-38