● Number of inputs: 4

● Type: Non-polarized, optically isolated from each other and from the computer (CMOS compatible)

● Voltage: 3 to 31 DC or AC RMS (40Hz to 10kHz)

● Isolation: 500V* (see manual) channel-to-ground and channel-to-channel

● Resistance: 1.8K ohms in series with opto-coupler

● Filter Response: Rise Time = 4.7 mS / Fall Time = 4.7 mS

● Non-Filter Response: Rise Time = 10 uS / Fall Time = 30 uS

*Notes on Isolation:

- Opto-Isolators and connectors are rated for at least 500V, but isolation voltage breakdowns will vary and is affected by factors like cabling, spacing of pins, spacing between traces on the PCB, humidity, dust and other environmental factors. This is a safety issue so a careful approach is required. For CE certification, isolation was specified at 40V AC and 60V DC. The design intention was to eliminate the influence of common mode. Use proper wiring techniques to minimize voltage between channels and to ground. For example, when working with AC voltages do not connect the hot side of the line to an input. Tolerance of higher isolation voltage can be obtained on request by applying a conformal coating to the board.

● Number of outputs: 4 SPDT form C

● Contact Type: Single crossbar; Ag with Au clad

● AC Load: 0.5 A at 125 VAC (62.5 VA max.)

● DC Load: 1A at 24 VDC (30 W max.)

● Switching Voltage: 125 VAC, 60 VDC max.

● Switching Current: 1A max.

● Contact Resistance: 100 mOHM max

● Contact Life: mech’l: 5 million operations min.

● Operating Time: 5 milliseconds max.

● Release Time: 5 milliseconds max.

● I/O Connections: There are 9 pins per port including common grounds. All RS-232 signals are supported and present at the DB9 connectors.

- RS-422 data signals – Tx+, Tx-, Rx+, Rx-, GND

- RS-485 data signals – 2 wire: Tx/Rx+, Tx/Rx-, GND

- 4 wire: Tx+, Tx-, Rx+, Rx-, GND

- Jumper selectable termination

● Serial Data Rates: Up to 230.4K bps, asynchronous for RS-232

● Up to 921.6K bps, asynchronous for RS-422 & RS-485.

● Multidrop: Compatible with RS-485 specifications. Up to 32 drivers and receivers allowed on line. Driver / Receivers used are type SP491.

● Character Length, Parity and Stop Interval: 5,6,7, or 8 bits; Even, odd, or none; 1, 1.5, or 2 bits

● Receiver Sensitivity: ±200 mV differential input

● Common Mode Voltage: +12V to -7V

● Transmitter Output Drive: 60 mA with thermal shutdown

● Termination: Jumper selectable per channel for RS-485 mode

● Bias: On-board from factory on transmit lines for RS-485 & RS-422

● USB 1.1 and 2.0 host compatible

● Operating Temperature Range: 0°C. to +60°C

● Storage Temperature -40° to +85°C

● Humidity 5% to 95% , non-condensing

● Size: 4 inches wide by 4 inches deep by 1.8 inches high

● 5V@ 120mA Quiescent, 320mA maximum

● 20mA for each activated relay(80 max)

● 0-60mA for each COM channel

● +5VDC provided via USB cable up to 500mA

● This product is designed to be in full compliance with CE requirements.