ElmoMC Multi-Axis Motion Controller-Maestro Installation Guide - Manual (Page 21)

Maestro Installation Guide Installation
MAN-MASIG (Ver 1.33)
3-11
3.5.1 RS-232 Communication
(if needed)
Notes for connecting the RS-232 communication cable:
ƒ Use of a standard, commercial CAT-5 null-modem cable may be acceptable for most
applications. However, Elmo recommends using a 26 to 28 AWG, twisted pair cable
shielded by aluminum foil and copper braid with drain wire.
ƒ Elmo recommends that both female connectors have a metal cover.
ƒ Ensure that the shield of the cable is connected to the metal shell of the female connectors.
The drain wire can be used to facilitate the connection.
ƒ Connect the shield of the cable to the PE of the host (PC). Usually, this connection already
exists internally inside the PC. You can use the drain wire to facilitate connection.
Pin PC
Signal
Maestro
Signal
Pin Function Pin Location
1 — — 1 —
2 Rx Tx 3 RS-232 Rx to Tx
3 Tx Rx 2 RS-232 Tx to Rx
4 — — 4 —
5 COMRET COMRET 5 Communication
Return
6 — — 6 —
7 — — 7 —
8 — — 8 —
9 — — 9 —
* Metal
shell
Drain
wire
Drain
wire
* Metal
shell
Shield
9 pin D-sub socket
Table 3-7: RS-232 Crossed Cable - Pin Assignments
Figure 3-6: "Null Modem" Connection Diagram