Digital Inputs; Chapter 2 - Connections; Digital I/O Connections; Ground - B&B Electronics RS-232 Digital I/O Module 232SDD16 User Manual

Chapter 2 - Connections

This chapter will cover the connections required for the
232SDD16. There are three sets of connections: digital I/O, serial
port, and power supply. Do not make any connections to the
232SDD16 until you have read this chapter.

Digital I/O Connections

Connections to the I/O lines are made through the DB25S
(female) I/O port connector. Refer to Table 2.1. See Chapter 5 for
I/O interfacing examples.

Digital Inputs

The digital input lines are CMOS/TTL compatible and can handle
voltages from 0Vdc to +5Vdc.
Digital Outputs
The digital output lines have a maximum voltage of +5Vdc and
are CMOS/TTL compatible.

Ground

The pin should be connected to your external digital devices
ground.
232SDD16-1005 Manual
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PH (815) 433-5100 -- FAX (815) 433-5104
DB-25S
Pin #
Serial Port Connections
In order to communicate to the 232SDD16 module it must be
connected to an RS-232 serial port. The unit automatically detects
baud rates from 1200 to 9600. A data format of 8 data bits, 1 stop
bit and no parity is used. The 232SDD16 is configured as a DCE
device (See Table 2.2). If your communications equipment is
configured as a DTE device, such as a standard IBM PC serial port,
the 232SDD16 should be connected using a "straight through" DB-
25 cable or a standard DB-9 to DB-25 cable adapter as shown in
Table 2.3. If your communications equipment is configured as a
DCE device, such as a modem, the 232SDD16 should be connected
using a "null modem" cable (See Table 2.4).
5 6
Table 2.1 - 232SDD16 I/O Port Pinout
DB-25S
Function Pin #
1 No connection 14
2 No connection 15
3 No connection 16
4 No connection 17
5 No connection 18
6 No connection 19
7 Ground 20
8 +12Vdc Input 21
9 I/O #0 22
10 I/O #1 23
11 I/O #2 24
12 I/O #3 25
13 I/O #4
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PH (815) 433-5100 -- FAX (815) 433-5104
Function
I/O #15
I/O #14
I/O #13
I/O #12
I/O #11
I/O #10
No connection
I/O #9
I/O #8
I/O #7
I/O #6
I/O #5
232SDD16-1005 Manual