Aposonic A-S1604R20A - Manual (Page 19)

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 RS-485 keyboard or Terminal
Connect the RS-422/485 connector to a RS-485 keyboard controller or VT-100
terminal via the appropriate cables. Please make sure to setup the RS-422/485
configurations as described in
Section 6.9 accordingly. Please refer to
Appendix C for the Keyboard Control Protocol for the digital video recorder.
 eSATA Hard Disk
Connect the eSATA connector to an eSATA hard disk for HDD extension.
 GPS modem
Connect the RS-232 connector to GPS modem via the appropriate cable. The
system supports the GPS modems with NMEA0183 protocol. Please make sure
to setup the RS-232 port (
Section 6.9 ) accordingly.