Chapter 2: Installation and wiring
EST iO64 and iO500 Technical Reference Manual 71
SA-232 wiring
The optional RS-232 card can be wired to a printer to print system
events or wired to a computer to download to the panel.
Circuit specifications
• Serial communications
Asynchronus communications maximum resistance: 13
Maximum capacitance: 0.7 µF
• Wire length: 50 feet max.
• Signal voltage: +/- 10 V
• Operating current
Standby/Alarm: 13 mA
Max.: 20 mA
• Printer communication speed: 9600 baud
SA-232 wiring connections
RTS (green wire)
TXD (white wire)
RXD (red wire)
GND (black wire)
Printer wiring
Note: The printer must be configured through programming for
proper operation.
Wiring to a printer:
1. Locate the serial port on the back of the printer.
2. Connect the DB-25 end of the RS-232 cable to the serial port on
the back of the printer.
3. Connect the other end of the RS-232 cable to the RS-232 card.
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