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
