Digital I/O Connections

The digital I/O connections are made on the I/O port, which is a DB-25S (female) connector. Table 2.1 shows the pinout of the I/O port. The next sections explain the functions and connections for the various digital signals.

Table 2.1 - 485SDA10 I/O Port Pinout

DB-25S		DB-25S
Pin #	Function	Pin #	Function

1	GND	14	Digital Output #0
2	+12V DC Output*	15	Digital Output #1
3	Digital Input #0	16	Digital Output #2
4	Digital Input #1	17	+5V DC Output
5	Digital Input #2	18	A/D Ref. Input +
6	Digital GND	19	A/D Ref. Input -
7	Analog GND	20	No connection
8	A/D Input #0	21	A/D Input #6
9	A/D Input #1	22	A/D Input #7
10	A/D Input #2	23	A/D Input #8
11	A/D Input #3	24	A/D Input #9
12	A/D Input #4	25	A/D Input #10
13	A/D Input #5

*Actual output is equal to power supply input minus 0.7V DC

Digital Inputs #0-2

The digital input lines are CMOS/TTL compatible and can handle voltages from -30V DC to +30V DC. If a digital input is from -30V DC to 1.0V DC, the state will be read as a “0” (LOW). If a digital input is from 2.0V DC to 30V DC, the state will be read as a “1” (HIGH). Connect unused digital inputs to digital ground.

Digital Outputs #0-2

The digital output lines are CMOS/TTL compatible. A digital output that is set to a “0” (LOW) will output a voltage from 0 to 0.6V DC. A digital output that is set to a “1” (HIGH) will output a voltage from 4.3V DC to 5.0V DC. Refer to Chapter 1, Specifications, for more information. Unused digital output lines should be left open.

8	485SDA103798 Manual

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RS-485 specifications

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