G7 ASD Operation Manual 27
CNU1/1A and CNU2/2A Pinout
Note: For normal operation, connect CNU1 to CNU1A or CNU2 to CNU2A. DO NOT
connect both. If both are connected, the TTL and RS232/
RS485 signals will be
transferred simultaneously to and from the EOI and the control board resulting in a
Communications Lost error message or erratic ASD operation.
Note: Connecting CNU1 to CNU2A will result in a continuous splash screen display.
Connect CNU1 to CNU1A and continue normally.
Connecting CNU2 to CNU1A will result in a continuous splash screen display.
Connect CNU2 to CNU2A and continue normally.
Note: See the 7-Series Communications Manual (P/N 53840) for further information on the
G7 communications protocol and system configuration requirements.
CN3 Pinout‘
CN3 is used for RS232/RS485 serial communications.
Pin #
CNU1 Pinout
(Controller PCB)
CNU1A Pinout
(EOI)
Pin #
CNU2 Pinout
(Controller PCB)
CNU2A Pinout
(EOI)
1 P24 P24 1 P24 P24
2 Gnd Gnd 2 Gnd Gnd
3 Tx (-) RXA 3 Rx Tx
4 Rx (+) TXA 4 Gnd Gnd
5 Rx (-) TXB 5 Tx Rx
6 Tx (+) RXB 6 Gnd Gnd
7 RS232/RS485 CNU3 Pin-7 7 Open Open
8 Gnd Gnd 8 Gnd Gnd
Pin Number
CNU3 Pinout
(Controller PCB)
1 RS232/RS485 Signal +
2 RS232/RS485 Signal -
3 RS232/RS485 Signal Gnd
4 Shield
