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APPENDIX A
PATTON MODEL 2021 SPECIFICATIONS
Interfaces: EIA RS-232/ITU/CCITT V.24, ITU/CCITT
X.21
Data Rates: 0 - 384 Kbps
Transmission Mode: Full or half duplex
Protocol: Transparent to protocol
Clocking: Set by connected DCE devices
Connectors: DB-25 male or female on RS-232 side, DB-
15 male or female on X.21 side
Power Supply: None required; uses power from RS-232
data and control signals
Temperature Range: 0-60°C (32-140°F)
Altitude: 0-15,000 feet (0-5,000 meters)
Humidity: 5 to 95% non-condensing
Dimensions: 2021XC-XT: 2.66"L x 2.10"W x 0.73"H
2021XT-XC: 3.56”L x 2.10”W x 0.80”H
Weight: 14 oz, including cable and connectors
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APPENDIX B
PATTON MODEL 2021 INTERFACE STANDARDS
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Model 2021 X.21 Interface
1 FRAME GROUND
2 TRANSMITTED - A
3 CONTROL - A
4 RECEIVE - A
5 INDICATION - A
6 SIGNAL TIMING - A
7
8 SIGNAL GROUND
TRANSMIT B 9
CONTROL B 10
RECEIVE B 11
INDICATION B 12
14
15
SIGNAL TIMING 12
1- (FG) Frame Ground
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect
9- (DCV) +DC Test Voltage
14
Transmit Clock -15
16
Receive Clock -17
18
19
Data Term. Ready (DTR) - 20
21
22
23
External Transmit Clock -24
Test Mode (TM) -25
Model 2021 RS-232 Interface
1- Frame Ground
2- Transmit - A
3- Control - A
4- Receive - A
5- Indication - A
6- Signal Timing - A
7
8- Signal Ground
Transmit - B - 9
Control - B -10
Receive - B -11
Indication - B -12
Signal Timing -13
14
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