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APPENDIX A
SPECIFICATIONS
Transmission Format: Asynchronous, full duplex, half duplex
Transmission Line: Two unconditioned twisted pair AWG 19–26
Interfaces: EIA RS-232, ITU/CCITT V.24
Data Rates: 0–38.4 kbps
Isolation: Minimum 1500 V RMS via custom
transformers
Surge Protection: 600W power dissipation at 1 mS
Factory Switch Setting: DCE (transmits from RS-232 on pin 3)
Control Signals: CTS follows RTS from the terminal (DTE);
DSR follows DTR from the terminal (DTE);
CD indicates reception of carrier
RTS/CTS Delay: Approximately 30 mS
Connectors: DB-25 male or female on RS-232 side; RJ-
11, RJ-45 or terminal block with strain relief
on line side
Power Supply: No external power required; uses power
from EIA data and control signals
Temperature Range: 0–60°C (32–140°F)
Altitude: 0–15,000 feet (0–4,500 meters)
Humidity: 5 to 95% non-condensing
Weight: 2 oz. (60 grams)
Dimensions: 3.54L x 2.09W x 0.79H in.
(90L x 53W x 20H mm)
11
APPENDIX B
RS-232C PIN CONFIGURATIONS
12
Distance Table (miles)
Data Wire Gauge
Rate 19 24 26
1,200 to 38,400 6.0 4.0 2.5
1- (FG) Frame Ground
2- (TD) Transmit Data To Model 1012B
3- (RD) Receive Data From Model 1012B
4- (RTS) Request to Send To Model 1012B
5- (CTS) Clear to Send From Model 1012B
6- (DSR) Data Set Ready From Model 1012B
7- (SG) Signal Ground
8- (CD) Carrier Detect From Model 1012B
9- External Power To Model 1012B
To Model 1012B Data Term. Ready (DTR) - 20
DIRECTION "DCE" STANDARD SETTING DIRECTION
1- (FG) Frame Ground
2- (TD) Transmit Data From Model 1012B
3- (RD) Receive Data To Model 1012B
4- (RTS) Request to Send From Model 1012B
5- (CTS) Clear to Send To Model 1012B
6- (DSR) Data Set Ready To Model 1012B
7- (SG) Signal Ground
8- (CD) Carrier Detect To Model 1012B
9- External Power To Model 1012B
From Model 1012B Data Term. Ready (DTR) - 20
DIRECTION "DTE" STANDARD SETTING DIRECTION