162Functions to Use as NecessaryConnecting an External DeviceConnecting to an External DeviceThe location information data can be exchanged with commercially available GPSreceivers or other external devices by using the optional Data Cable (CT-170).CT-170 (optional)TipConnect the Data Cable (CT-170) and the Data Output Cable (CT-176) referring to the instructionmanual for the connected device and the following cable specifications.Connection CablesData Cable (CT-170)⑦ RXD (Serial data input [FT2D← External device) ① RXD (Serial data input [FT2D←External device])⑧ TXD (Serial data output [FT2D→External device) ② TXD (Serial data output [FT2D→External device])⑪ GND ③ GNDData Output Cable (CT-176)① RXD (Serial data input [FT2D←External device) ① TXD (Serial data output [FT2D→External device])② TXD (Serial data output [FT2D→External device) ② RXD (Serial data input [FT2D←External device])③ GND ③ GND