Gasboy CFN Series Diagnostic Manual - Manual (Page 356)

Site Controller III
12-22 1116
RS-485 JUNCTION BOX
The RS-485 junction box provides the interface for the RS-485 section of the site controller. This
unit:
•
provides the terminal block for field wiring of the RS-485 lines
•
provides protection against noise on the RS-485 lines
•
must be properly grounded
Layout
Connectors
TB1 - RS-485 Field Wiring (Unprotected)
Pinout Pin Function Voltage
1 RS-485 Tx+
2 RS-485 Tx-
To Site Controller
 +5 VDC signal
between pins 1 & 2
3 RS-485 Rx+
4 RS-485 Rx-
From Site Controller
 +5 VDC signal
between pins 3 & 4
5 Ground Ground
P1 & P2 - Protected RS-485 Signals to Site Controller
Pinout Pin Function Voltage
1 RS-485 Rx+
2 RS-485 Rx-
To Site
Controller  +5 VDC signal
between pins 1 & 2
3 RS-485 Tx+
4 RS-485 Tx-
From Site
Controller  +5 VDC signal
between pins 3 & 4