Digital I/O Connections
The digital I/O connections are made on the I/O port, which consists of terminal blocks. Table 2.1 shows the terminal block assignments.
Digital Input
Terminal block 7 is the digital input line. This input is CMOS/TTL compatible and can handle voltage from -30VDC to 30VDC. If a digital input is from -30VDC to 1.0VDC, the state will be read as a “0” (LOW). If a digital input is from 2.0VDC to 30VDC, the state will be read as a “1” (HIGH). If the digital input is not used, it should be connected to GND. Figure 2.3 show the connections required for the digital input.
Digital Output
Terminal Block 6 is the digital output line. This line is CMOS/TTL compatible. When the digital output is set to “0” (LOW), the output voltage will be between 0 and 0.6VDC. When the digital output is set to “1” (HIGH), the output voltage will be between 4.3VDC to 5.0VDC. Figure 2.3 shows the connections required for the digital output.
232OPSDA
Digital Output
Digital Input
GND
0 to 5VDC Output
-30VDC to 30VDC Input
To Device GND
Figure 2.3: Digital I/O Required Connections
Serial Port Connections
In order to communicate with the 232OPSDA module it must be connected to an RS-232 serial port. The unit automatically detects baud rates from 1,200 to 9,600. A data format of 8 data bits, 1 stop bit and no parity is used. The 232OPSDA 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 232OPSDA 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 232OPSDA should be connected using a “null modem” cable (See Table 2.4).
Documentation Number 232OPSDA1397 Manual | 7 |
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