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IMPORTANT: Before you proceed with cabling, you must know whether the devices to which you will connect the Model 24SII DES are DTE (Data Terminal Equipment) or DCE (Data Communication Equipment). The following devices are generally DTE: terminals, printers, computers like the IBM PC. The following devices are DCE: modems and some computers.

If your device transmits data on Pin 2 or receives data on Pin 3, it is DTE. If your device receives data on Pin 2 and transmits data on Pin 3, it is DCE. However, to verify the interface requirements, please refer to the Owner's Manual for your device.

The serial ports on the M24SII-V04 I/O module has DB-25 female DCE connectors and use the following signals for communication:

 

 

 

DCE PORT SIGNALS

 

 

 

 

PIN#

EIA-232

DIRECTION

DESCRIPTION

 

 

 

 

 

 

 

 

 

 

1

PGND

----

 

Protective ground

 

 

 

 

 

2

TX

Input

 

Data in

 

 

 

 

 

3

RX

Output

 

Data out

 

 

 

 

 

4

RTS

Input

 

Internally enabled if no wire connected

 

 

 

 

(normally not used).

 

 

 

 

 

5

CTS

Output

 

-12V when DCE device's buffer is full.

 

 

 

 

 

6

DSR

Output

 

+12V when DCE device powers-up.

 

 

 

 

 

7

SGND

----

 

Signal ground

 

 

 

 

 

20

DTR

Input

 

Transmit enabled when +12 V.

 

 

 

 

 

 

 

 

 

 

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