OC950-504-01

OC950-504-01 is a Pacific Scientific option card in the OC950 Option Cards series. It includes a PacLAN interface with a data rate of 2.5 MBaud for network communications. PacLAN supports a maximum bus length of 305 m and up to eight stations per segment, while 93 Ω termination matches the network impedance. The serial interface supports both RS-232 and RS-485 communication standards.

The card provides 21 bidirectional digital I/O channels for receiving inputs or controlling outputs. Each input has a 10 kΩ pull-up resistor connected to +12 VDC, and a 100 µs RC filter constant helps suppress short signal disturbances. The maximum logic voltage is 40 V. Outputs use open-drain DMOS devices and can sink up to 100 mA per applicable output.

Program storage is provided by 128K × 8 NVRAM, which retains data for 10 years without continuous power. The user supply operates at 5 VDC ±5%, establishing an acceptable range of 4.75 to 5.25 VDC. Its maximum user-supply current is 200 mA.