Wiring Instructions - ICP DAS USA M2M-710D User Manual

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2.2 Wiring Instructions

The communication interface includes RS-232, RS-485 and Ethernet. The wiring instructions

are described in section 2.2.1, 2.2.2 and 2.2.3.

2.2.1 RS-232 connection

There are two types of RS-232 ports, DTE (Data Terminal Equipment, like PC, Serial

Printers, PLC, and Video Cameras) and DCE (Data Circuit-Terminating Equipment, like

modem) type, and that the signal names and pin numbers are the same, but signal flow is

opposite!

The M2M-710D module is a DTE and the user can uses "3-wire" RS-232 or "5-wire" RS-

232 to connect. When connecting the M2M-710D to a DCE device, the user just needs to

match the signal names. When connecting the M2M-710D to a DTE device, the user

needs to use a crossover cable (TX crosses to RX, GND to GND), as shown in the figure.

2.2.2

RS-485 connection

The RS-485 wiring diagram is shown in figure 7.

M2M-710D User Manual (Version 1.00, Mar/2009)

Figure 5 connection of RS-232 with 3-write

Figure 6 connection of RS-232 with 5-write

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