Edwards 3-RS232 — ancillary RS-232 communication card for the EST3 central processor.
The 3-RS232 gives an EST3 node its serial world. It plugs into connector J3 on the CPU card and rides on the back of the 3-CPU3, adding two optically isolated RS-232 ports wired Class B. Edwards specifies them for a printer and/or an external command centre, and more broadly for serial devices such as printers, modems and external command and control equipment; entire-network downloading to all 64 nodes also runs through this card. It is a serial interface only — panel-to-panel networking is the separate RS-485 card in the adjacent J2 slot.
- Two optically isolated RS-232 circuits, Class B
- 300, 1200, 2400, 4800, 9600, 19,200 and 38,400 baud
- 24 VDC; 58 mA standby and 58 mA alarm
- Circuit length 50 ft (15.2 m) max, 18 AWG minimum wire
- 32°F to 120°F, 0 to 93% non-condensing; ship weight 0.33 lb
Do not confuse it with the network cards on the same CPU: 3-RS485A and 3-RS485B are the RS-485 data and audio riser cards and draw 98 mA, not 58 mA. Suffix -E is the EN 54 build, and the 3- prefix is EST3, not EST4.
