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APPENDIX A
SPECIFICATIONS
Transmission Format: Asynchronous
Data Rate: Up to 115,200 bps
Transmit Line: 2, 4 wire unconditioned twisted pair
Transmit Mode: Full or half duplex
Transmit Level: 0 dBm
Range: Up to 9 miles
Control Signals: DSR turns "ON" immediately after the terminal
raises DTR; DCD turns "ON" after recognizing the
receive signal from the line; CTS turns on after
the terminal raises RTS
Carrier: The carrier is strap selected either continuous operation or
switched operation, controlled by RTS
Surge Protection: 600W power dissipation at 1 mS and response
time less than 1.0 pS
Power: None required, uses ultra low power from EIA data and con
trol signals
Size: 2.66" x 2.10" x 0.73"
APPENDIX B
RS-232C PIN CONFIGURATIONS
13 14
1- (FG) Frame Ground
2- (TD) Transmit Data To Model 285
3- (RD) Receive Data From Model 285
4- (RTS) Request to Send To Model 285
5- (CTS) Clear to Send From Model 285
6- (DSR) Data Set Ready From Model 285
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect From Model 285
To Model 285 Data Term. Ready (DTR) - 20
DIRECTION STANDARD "DCE" SETTING DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data From Model 285
3- (RD) Receive Data To Model 285
4- (RTS) Request to Send From Model 285
5- (CTS) Clear to Send To Model 285
6- (DSR) Data Set Ready To Model 285
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect To Model 285
From Model 285 Data Term. Ready (DTR) - 20
DIRECTION STANDARD "DTE" SETTING DIRECTION