ViewStat Installation and Wiring
15
ViewStat Communicating Thermostat
Connecting to an Axcess Master Controller via the RS232/422/485 (DB-9) Port

The table below lists the connector pins, signal types, and signal functions for RS-232/RS-422/RS- 485 DB-9

(male) connector on an Axcess Master Controller (i.e. Axcent3 or Axcent3/PRO).

FIG.9 shows the wiring configuration for Axcess systems (using the DB-9 PROGRAM port).

DB-9 Pinouts Wiring and Baud Configurations

Pin Signal Function RS-232 RS-422 RS-485
1 RX- Receive data X X (strap to pin 9)
2 RXD Receive data X
3 TXD Transmit data X
4 TX+ Transmit data X X (strap to pin 6)
5 GND Signal ground X X
6 RX+ Receive data X X (strap to pin 4)
7 RTS Request to send X
8 CTS Clear to send X
9 TX- Transmit data X X (strap to pin 1)
The X’s show where to terminate the wires on the DB-9 connector.
FIG. 9 Connecting the ViewStat to an Axcess Control System via the RS232/422/485 (DB-9) port
ViewStat
(Communication
terminal)
RS232/422/485
Port