Moxa IMC-21A-M-SC Installation Guide download pdf (Page 6)

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Communication Connections

RJ45 Ethernet Port Connection

The IMC-21A has one 10/100BaseT(X) Ethernet port located on the front

panel for connecting to Ethernet-enabled devices.

Pinouts and cable wiring diagrams for both MDI (NIC-type) and MDI-X

(HUB/switch-type) ports for both straight-through and cross-over

Ethernet cables are shown below:

MDI Port Pinouts

MDI-X Port Pinouts

8-pin RJ45

Signal

Tx+

Rx+

Tx-

Rx-

Rx+

Tx+

Rx-

Tx-

Straight-Through Cable Wiring

Cross-Over Cable Wiring

Fiber Optic Port Connection

The concept behind the SC/ST port and cable is quite straightforward.

Suppose you are connecting devices I and II. Contrary to electrical signals,

optical signals do not require a circuit in order to transmit data.

Consequently, one of the optical lines is used to transmit data from device

I to device II, and the other optical line is used transmit data from device

II to device I, for full-duplex transmission.

All you need to remember is to connect the Tx (transmit) port of device I

to the Rx (receive) port of device II, and the Rx (receive) port of device I

to the Tx (transmit) port of device II. If you make your own cables, we

suggest labeling the two sides of the same line with the same letter

(A-to-A and B-to-B, as shown below, or A1-to-A2 and B1-to-B2).

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Moxa IMC-21A-M-SC Installation Guide Page 6