TELOS TWOX12 USER’S MANUAL
INSTALLATION
CHAPTER 2 49
2.9.2 Special Auxiliary Access ports
These ports are unimplemented and are reserved for future use.
SAA 1
SAA 2
The input and output electrical characteristics are the same as the general purpose inputs
and outputs, see section 2.9.1. Note that the +5 volts DC on pin 3 has both SAA ports in
parallel with pin 8 on the Parallel remote control port. Failure to limit the combined current
on these pins to 400mA could cause hardware damage or system instability.
2.9.3 RS-232 Serial Remote Control
The RS-232 serial port supports asynchronous data, 8 bits, no parity, 2 stop bits, 2400-
38,400 bits per second. The Clear to Send (CTS) handshake signal is provided, however
any handshake signals from the external equipment are ignored. This port is primarily for
troubleshooting purposes and should be used as directed by Telos Customer Support.
Connector is a 9 pin D-Sub connector with the following pin-out:
RS-232
DCE
PIN FUNCTION
2 Rx (TWO to Computer)
3 Tx (Computer to TWO)
5 Ground
8 CTS (TWO to Computer)
Using a 9 pin D-Sub connector, this is an RS-232 serial port using the standard PC-style format,
configured as if it were a modem.
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