B&B Electronics Digital I/O Connections, 232SDD16 I/O Port Pinout, Serial Port Connections

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 5

Table 2.1 - 232SDD16 I/O Port Pinout

DB-25S		DB-25S
Pin #	Function	Pin #	Function
1	No connection	14	I/O #15
2	No connection	15	I/O #14
3	No connection	16	I/O #13
4	No connection	17	I/O #12
5	No connection	18	I/O #11
6	No connection	19	I/O #10
7	Ground	20	No connection
8	+12Vdc Input	21	I/O #9
9	I/O #0	22	I/O #8
10	I/O #1	23	I/O #7
11	I/O #2	24	I/O #6
12	I/O #3	25	I/O #5
13	I/O #4

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-

25cable 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).

6 232SDD16-1005 Manual

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