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Chapter 3: Communication Setup
ISACC RS232 SPECIFICATIONS
Start/Stop protocol: XON/XOFF only
Communications protocol: 8 data bits, no parity, 1 stop bit
DB25 socket configuration: DCE female
RS232 receptacle configuration (refer to diagram below):
Pin 2 = Received Data (Receive)
Pin 3 = Transmitted Data (Send)
Pin 6 = DSR (Data Set Ready)
Pin 7 = Ground
13
12 11 10 9 8 7 6 23451
25 24 23 22 21 20 19 18 17 16 15 14
ISACC's RS232 DB25 Socket
NETWORK WIRING
ISACC units may be connected in a network using as few as two units and as many as 16
units. The units are connected together using 2 conductor twisted pair cable (Belden 9841 or
equivalent) to the networking terminal block (also called a port) labelled RS485. The 2-
position RS485 terminal block is positioned next to the RJ11 phone jack on the circuit board.
See below:
PHONE
AB
RS485
P9
OFF
ON
RS485 networking port