38 EX II Serial Controllers Reference Guide
3M Touch Systems Proprietary Information
Touch Screen Cable Connections
The touch screen cable has a 5-pin single row locking female connector that plugs into
the controller. Table 13 describes the pins on this connector.
Table 13 Touch Screen Cable Connector for EX II 7720SC Controllers
Pin Wire Color Description
3 Cable shield/drain wireConnects to the flex tail shield, which must not be grounded
because the EX II 7720SC drives the flex tail shield with an AC
waveform.
1
2
4
5
Upper left (UL) corner
Upper right (UR) corner
Lower right (LR) corner
Lower left (LL) corner
Communication Connector
You will need a method of establishing the serial data communication between the
controller and your system. You can build your own or purchase the standard 3M Touch
Systems RS-232 serial cable (P/N 7310101). Table 14 describes the pins for this cable,
which connects to a serial communication (COM) port on the PC.
Table 14 COM Connector for EX II 7720SC Controllers
9-pin D 7-pin Molex Wire
Color
Description
1 No
connection
——— Data Carrier Detect (DCD).
Connected to DTR and DSR.
2 2 Brown Transmit Data (TXD). Pin 2 is the controller’s output to the host.
3 3 Red Receive Data (RXD). Pin 3 is the controller’s receive from the host.
4 No
connection
——— Data Terminal Ready (DTR).
Connected to DSR and DCD.
5 5 Blue Power supply ground.
6 No
connection
——— Data Set Ready (DSR).
Connected to DTR and DCD.
7 1 Black Request To Send (RTS).
Connected to CTS.
8 4 Green Clear To Send (CTS).
Connected to RTS.
9 Not used
Sleeve 6 White DC power jack (+5 VDC).
Pin 7 Shield Cable shield connected to ground.
DC power jack (ground).
Shell 7 ——— Chassis (earth) ground.
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