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Maestro Installation Guide
Installation
MAN-CELIG (Ver. 1.0)
3.5.1
3-11
RS-232 Communication (if needed)
Notes for connecting the RS-232 communication cable:
Use a standard, commercial 3-core null-modem cable when connecting the serial
port of the PC to the Maestro.
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 plug must have a shield cover.
Ensure that the shield of the cable is connected to the shield of the plug. The drain
wire can be used to facilitate the connection.
Pin
Signal
Signal
Pin
Function
1
—
—
1
—
2
—
—
2
—
3
Tx
Rx
6
RS-232 TX to Rx
4
—
—
4
—
5
COMRET
COMRET
5
Communication Return
6
Rx
Tx
3
RS-232 Rx to Tx
7
—
—
7
—
8
—
—
8
—
Pin Location
9 pin D-sub socket
Table 3-7: RS-232 Cross Cable - Pin Assignments
Maestro RS-232
PC RS-232
Tx
Rx
Rx
Tx
COMRET
Figure 3-7: "Null Modem" Connection Diagram