Barnett Engineering B1474 RTS Control, Buffer, Wire, Replace The Top Cover, Apply Voltage

To operate full duplex, leave SW2.8 OFF. To operate half duplex, set switch SW2.8 ON. If a 2 wire circuit is used, the modem will only operate half duplex.

RTS Control

SW3.1, when ON, will assert RTS continuously. This causes PTT to be asserted and transmit tones to be generated. The switch should be on for a no handshaking, non-buffered configuration. The continuous RTS is also useful for testing purposes.

Buffer

If hardware handshaking is desired, connect the RTS and CTS signals to the DB-25S connector and set SW3.2 OFF. If XON/XOFF control (software handshaking) or no handshaking with full buffering is desired, set SW3.2 ON and remove connections from the RTS and CTS positions in the DB-25S connector.

2/4 Wire

Set SW3.3 and SW3.4 OFF if 4 wire communications are used. Set SW3.3 and SW3.4 ON if

2 wire communications are used. If a 2 wire circuit is used, the modem will only operate half duplex.

(4) Replace The Top Cover

Place the top cover back onto the base and tighten the two center screws.

(5) Apply Voltage

Apply the proper voltage to the unit. If the LEDs are enabled, the run lamp will illuminate, indicating that power is available at the modem.

B1474 BARNETT ENGINEERING LTD. PAGE 15