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Black Box V.24/X.21, User Manual, Page: 5 / 9

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5

V.24/X.21 AND X.21/V.24 INTERFACE CONVERTERS

4.  Applications

Model IC933A installs between a V.24 terminal 
or multiplexor and an X.21 modem and Model
IC944A installs between an X.21 terminal or
multiplexor and a V.24 modem. Figures 4-1 
and 4-2 illustrate these applications.

Figure 4-1. Typical Application of the IC933A.

Figure 4-2. Typical Application of the IC944A.

X.21

MODEM

TERMINAL OR

MUX

IC933A

V.24/X.21

V.24

X.21

MODEM

TERMINAL OR

MUX

IC944A

X.21/V.24

V.24

Summary of Contents for V.24/X.21

Page 1: ...INFORMATION Order toll free in the U S 24 hours 7 A M Monday to midnight Friday 877 877 BBOX FREE technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mail order Black...

Page 2: ...2 m Operation Synchronous full or half duplex Interfaces RS 232C V 24 X 21 Connectors IC933A 1 DB25 male DTE 1 DB15 male DCE IC944A 1 DB25 male DCE 1 DB15 female DTE Power 6 3 volts DC 35 mw from pin...

Page 3: ...CONVERTERS 2 Features Converts RS 232 V 24 to X 21 interface and vice versa Equipped with cable and connectors Transparent to protocol Installs immediately Operates without AC power Compact and light...

Page 4: ...s from X 21 DTE to V 24 DCE Users can take advantage of high speed trunk lines with X 21 interfaces and still use existing V 24 multiplexers modems and terminals The compact lightweight conversion uni...

Page 5: ...21 modem and Model IC944A installs between an X 21 terminal or multiplexor and a V 24 modem Figures 4 1 and 4 2 illustrate these applications Figure 4 1 Typical Application of the IC933A Figure 4 2 T...

Page 6: ...the X 21 device DCE 5 2 Installing the X 21 DTE V 24 DCE IC944A Model To install the unit simply plug its DB15 female connector into the DB15 male connector on the X 21 device DTE Attach the unit s D...

Page 7: ...7 V 24 X 21 AND X 21 V 24 INTERFACE CONVERTERS 6 Pinning Diagrams Figures 6 1 and 6 2 show the pinning of each unit...

Page 8: ...Figure 6 1 IC933A Pinning RTS 4 10 3 C b C a CTS V 24 DTE X 21 DCE Schematic Diagram V 24 DTE X 21 DCE DB25 Male DB15 Male DCD TC RC TD RD 8 15 17 2 3 12 5 13 6 9 2 11 4 I b I a S b S a T b T a R b R...

Page 9: ...a C b C a S b S a T b T a R b R a Shield Signal GND RTS DCD TC RC TD RD 4 8 15 17 2 3 6 9 2 11 4 X 21 DTE V 24 DCE Schematic Diagram Protective GND 1 Signal GND 7 DSR DTR 20 Ck In Data In Ck In Data...

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