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724-746-5500 | blackbox.com

Page 19

Installation

Figure 4.

Typical multipoint set-up

Multipoint Twisted Pair Connection

The ME475A-R2 supports multipoint applications using a star topology. Maximum dis-
tance between the units will vary based upon the number of drops, data rate, wire
gauge, etc. The diagrams below show how to wire the one-pair and two-pair cables
properly for a star topology. Note that the ground connection is not needed.

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Summary of Contents for ME475A-R2

Page 1: ...ME475A R2 Async Sync Short Haul Modem...

Page 2: ...11 2 4 Configuration Switch Set S3 11 Switches S3 1 S3 2 Input Impedance 11 Switch S3 4 Mode Selection 12 Switch S3 5 RS 232 Initiation of Local Loopback Test 12 Switch S3 6 RS 232 Initiation of Remo...

Page 3: ...mat 26 A 2 Interface 26 A 3 Transmission Line 26 A 4 Data Rates 26 A 5 Clocking 26 A 6 Controls 26 A 7 Applications 26 A 8 Indicators 26 A 9 RTS Anti stream Timer 26 A 10 Diagnostics 27 A 11 Transform...

Page 4: ...nd if not installed and used properly that is in strict accordance with the manufacturer s instructions may cause interference to radio and television reception The ME475A R2 has been tested and found...

Page 5: ...e flow control support Built in transformer isolation high speed surge protection External AC power Bi color LED indicators Detects broken or inferior cable by lighting error LED 1 2 DESCRIPTION The M...

Page 6: ...CHES The ME475A R2 uses a unique set of 24 external mini DIP switches that allow config uration to an extremely wide range of applications These 24 DIP switches are grouped into three eight switch set...

Page 7: ...SWITCH SET S1 The DIP switches on S1 set data rate clock source async sync mode and carrier control method The default settings are summarized in Table 1 Table 1 ME475A R2 S1 Summary Switches S1 1 thr...

Page 8: ...ther the ME475A R2 is in asynchronous or synchronous operating mode Table 2 ME475A R2 Data Rate Settings S1 1 S1 2 S1 3 S1 4 Setting On On On On 1 2 kbps Off On On On 1 8 kbps On Off On On 2 4 kbps Of...

Page 9: ...applications 2 3 CONFIGURATION SWITCH SET S2 The DIP switches on S2 set word length extended signaling rate RTS CTS delay V 52 and V 54 diagnostic test and 2 and 4 wire operation S1 8 Setting Off Cons...

Page 10: ...s for in asynchronous data rates i e the actual variance from a given frequency level the ME475A R2 will tolerate Switches S2 4 and S2 5 RTS CTS Delay The combined settings for switches S2 4 and S2 5...

Page 11: ...ons of Switch S3 are shown in the table below Switches S3 1 S3 2 Input Impedance The setting for Switches S3 1 and S3 2 determines the ME475A R2 s input imped ance This allows you to choose the optimu...

Page 12: ...tions Switch S3 5 RS 232 Initiation of Local Loopback Test The setting for switch S3 5 determines whether or not the ME475A R2 s local analog loopback test can be initiated by raising pin 18 on the RS...

Page 13: ...st be 19 26 AWG dry unconditioned metallic wire see Appendix C for wire recommendations Dial up analog circuits such as those used with a standard Hayes type modem are not acceptable The twisted pair...

Page 14: ...cuit one at each end of the single pair wire In single pair multipoint applications you will need three or more ME475A R2 units These can be connected using a star topology although a daisy chain topo...

Page 15: ...mit lug TX or TX on both the local and remote ME475A R2 3 Connect the other wire of the pair to the other Transmit lug on both the local and remote ME475A R2 4 If there is a shield around the telephon...

Page 16: ...applications you will need three or more ME475A R2 units These can be connected using a star topology although a daisy chain topology is usu ally used Four Wire Cable Connection Via RJ 45 1 The RJ 45...

Page 17: ...nsitive to polarity 2 Connect one pair of wires in the telephone cable to the Transmit lugs TX and TX on the terminal block 3 Connect the other pair of wires in the telephone cable to the Receive lugs...

Page 18: ...re acting as slaves Up to 25 ME475A R2 slaves may be connected to one host ME475A R2 master SRM provided that the computing hardware and software support that many terminal drops In a multipoint envir...

Page 19: ...The ME475A R2 supports multipoint applications using a star topology Maximum dis tance between the units will vary based upon the number of drops data rate wire gauge etc The diagrams below show how...

Page 20: ...d to connect to a DTE If your RS 232 output device is DCE Operation Once you have configured each ME475A R2 unit properly and connected the twisted pair and RS 232 cables see Section 4 0 you are ready...

Page 21: ...green with data activity Red indicates a low RS 232 logic level green indicates a high RS 232 logic level Note RS 232 devices idle in a low state so the LED will glow red if the connections are correc...

Page 22: ...n detecting line quality the Error LED indicator is designed for 4 wire twisted pair cable only and may not function properly with two wire cable Setting Up The Error LED To Test Cable Quality If ther...

Page 23: ...he Error LED will light red indicating a streaming condition RTS continually on This feature prevents a malfunctioning termi nal from tying up a computer port in a multi drop or polling environment Wh...

Page 24: ...s no faults but the data terminal indicates a fault follow the manufacturer s checkout procedures for the data terminal Also check the RS 232 interface cable between the terminal and the ME475A R2 Rem...

Page 25: ...a 511 test pattern to the other unit If any errors are present the receiving modem s red ERROR LED will blink sporadically Note For this test to function the 511 switch on both ME475A R2 units must b...

Page 26: ...ire UTP 19 24 AWG A 4 DATA RATES Synchronous or asynchronous at 1 2 1 8 2 4 3 6 4 8 7 2 9 6 14 4 19 2 28 8 38 4 and 57 6 kbps switch selectable A 5 CLOCKING Internal external or receive recover A 6 CO...

Page 27: ...compliant Local Analog Loopback and Remote Digital Loopback activated by front panel switch or via RS 232 interface A 11 TRANSFORMER ISOLATION 1500 V RMS A 12 SURGE PROTECTION Immune to IEC 801 5 Lev...

Page 28: ...ms however distances may vary from those published in our catalog Resistance will also affect distance but not functionality Wire should be 26 ohms 4mm or larger smaller AWG Black Box products are des...

Page 29: ...4 0 22 5 8 0 12 9 6 6 10 6 4 6 7 4 19 200 16 0 25 8 8 5 13 7 7 0 11 3 5 1 8 2 14 400 17 0 27 4 11 0 17 7 9 2 14 9 6 5 10 50 9 600 18 5 29 8 13 0 20 9 10 4 16 7 7 5 12 1 7 200 19 0 30 6 13 5 21 7 10 9...

Page 30: ...724 746 5500 blackbox com Page 30 Black Box Short Range Modem C INTERFACE PIN ASSIGNMENT RS 232 Female D Sub 25 Connector DCE Orientation...

Page 31: ...724 746 5500 blackbox com Page 31 Black Box ME475A R2 Block Diagram D BLACK BOX ME475A R2 BLOCK DIAGRAM...

Page 32: ...ME475A R2 version 1...

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