Barnett Engineering B1474 operation manual Specifications General, DIP Switch Settings

2 SPECIFICATIONS GENERAL

Transmission Rate:	1200 Baud (Bell 202 signaling) or V.23 if factory installed
Transmission Format:	8 data bits, no parity, 1 stop bit if modem buffering is selected;
	otherwise transparent
Power Requirement:	Operates from 12 to 30 VDC. Current drain is 110 mA with the LEDs on,
	65 mA with the LEDs off.
Temperature Range:	-30oC to +50oC
Physical Size:	Approx. 10" x 5" x 1", inside a metal enclosure
Radio and Wireline:	Compression screw terminals located inside the enclosure
Data Connector:	RS232-C compatible, connections available through a DB-25S socket
	located on the side of the enclosure
Indicators:	Power ON, TXD, RXD, CD, RTS, CTS, BUSY
Receive Audio:	Single ended, AC coupled, -30 dBm to 0 dBm
Transmit Audio:	Single ended, AC coupled, -20 dBm to 0 dBm
Squelch Detection:	Single ended, 1M ohm impedance, DC coupled, detection range
	0 to 10 volts, polarity is DIP switch selectable
PTT:	Closure to ground for active, 0.5 A @ 50 volts max.
4 Wire Receive:	Balanced, 600 ohm impedance, -30 dBm to 0 dBm (operates full or
	half duplex)
4 Wire Transmit:	Balanced, 600 ohm impedance, -20 dBm to 0 dBm (operates full or
	half duplex)

DIP SWITCH SETTINGS

Transmitter Level:	-20 dBm to 0 dBm
Receiver Level:	-30 dBm to 0 dBm
Squelch Polarity:	Selects high or low going squelch monitor signals.
Carrier Detect Delay:	5 or 50 msec
Assert RTS:	Forces RTS on.
RTS/CTS Delay:	20, 35, 50, 100, 200, 300, 500, or 1000 msec. Allows the transmitter
	time to reach full power before data is transmitted.

B1474 BARNETT ENGINEERING LTD. PAGE 5