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Table 5: 3.5mm Phone Jack (Microphone In)
Pin
Name
1
GND
2
Tip
3
4
5
Ring
2.2 Wiring Instructions
The communication interface of M-4132 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 M2M series, 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 M-4132 module is a DTE and the user can uses "3-wire" RS-232
or "5-wire" RS-232 to connect. When connecting the M-4132 to a DCE
device, the user just needs to match the signal names. When connecting
the M-4132 to a DTE device, the user needs to use a crossover cable
(TX crosses to RX, GND to GND,), as shown in the figure 4, 5.
M-4132 User Manual (Version 1.60, May/2014)
Ground
Input Signal
-
N/A
-
N/A
Ground
M-4132
RS-232 Port
Figure 4: "3-wire" RS-232 (M-4132 to DTE)
Description
RS-232 Port
DTE
PAGE：10
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