Black Box ME935A Page 2 Manual Download

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TRADEMARKS

Trademarks

AT&T is a registered trademark of American Telephone and Telegraph Company.

Any other trademarks mentioned in this manual are acknowledged to be the
property of the trademark owners.

Summary of Contents for ME935A

Page 1: ... technical support 24 hours a day 7 days a week Call 724 746 5500 or fax 724 746 0746 Mailing address Black Box Corporation 1000 Park Drive Lawrence PA 15055 1018 Web site www blackbox com E mail info blackbox com NOVEMBER 2000 ME935A Async Short Haul Modem MP Power TD RD Control IN Control OUT Loopback Test ...

Page 2: ... TRADEMARKS Trademarks AT T is a registered trademark of American Telephone and Telegraph Company Any other trademarks mentioned in this manual are acknowledged to be the property of the trademark owners ...

Page 3: ...n a commercial environment Operation of this equipment in a residential area is likely to cause interference in which case the user at his own expense will be required to take whatever measures may be necessary to correct the interference Changes or modifications not expressly approved by the party responsible for compliance could void the user s authority to operate the equipment This digital app...

Page 4: ...ato eléctrico debe ser montado a la pared o al techo sólo como sea recomendado por el fabricante 8 Servicio El usuario no debe intentar dar servicio al equipo eléctrico más allá a lo descrito en las instrucciones de operación Todo otro servicio deberá ser referido a personal de servicio calificado 9 El aparato eléctrico debe ser situado de tal manera que su posición no interfiera su uso La colocac...

Page 5: ...existir una antena externa deberá ser localizada lejos de las lineas de energia 16 El cable de corriente deberá ser desconectado del cuando el equipo no sea usado por un largo periodo de tiempo 17 Cuidado debe ser tomado de tal manera que objectos liquidos no sean derramados sobre la cubierta u orificios de ventilación 18 Servicio por personal calificado deberá ser provisto cuando A El cable de po...

Page 6: ... 4 1 Twisted Pair Wiring Overview 11 4 1 1 Twisted Pair Connection Using Terminal Blocks 12 4 1 2 Twisted Pair Connection Using RJ 11 12 4 2 Wiring For Multipoint Circuits 13 4 2 1 Daisychain Topology 13 4 2 2 Star Topology 14 4 3 RS 232 Connection 14 5 Operation 15 5 1 LED Indicators 15 5 2 Loopback Test Modes 15 5 2 1 Local Analog Loop 15 5 2 2 Remote Analog Loop 16 6 Troubleshooting 17 Appendix...

Page 7: ... for transmit data receive data control in control out dual state for power loopback test Diagnostics Local Analog Loopback LAL Remote Analog Loopback RAL Optical Isolation 2500V RMS minimum Surge Suppression Over voltage protection for opto isolators via Silicon Avalanche Diodes Temperature Range 32 to 140 F 0 to 60 C Humidity Tolerance 5 to 95 noncondensing Maximum Altitude Range Up to 15 000 fe...

Page 8: ...ng either RJ 11 jack or terminal blocks both are included In addition the Async Short Haul Modem MP is perfect for low power RS 232 environments The Modem is AC powered and therefore is the recommended solution for RS 232 environments whose interface voltages are below RS 232 specifications The Modem supports data rates to 115 2 kbps and extends RS 232 transmission distances up to 14 miles 22 5 km...

Page 9: ...hat DIP switch 8 is not used 3 1 1 POINT TO POINT CONFIGURATION If you are installing these Modems in a point to point application with a computer printer or terminal configure the DIP switches on both Modems as follows Switch Number 1 2 3 4 5 6 7 Positions OFF OFF OFF ON ON ON OFF 3 1 2 MULTIPOINT CONFIGURATION The Modem supports multipoint operation in either daisychain or star configurations In...

Page 10: ...Control Voltage Carrier Switch Settings Mode Input Output Output Controlled DCE DTE CIn COut VOut by CIn 1 2 3 4 5 6 7 DCE 4 8 6 Disabled ON ON ON OFF OFF OFF OFF DCE 4 8 6 Enabled ON ON ON OFF OFF OFF ON DCE 4 11 20 8 6 Disabled OFF ON ON ON OFF OFF OFF DCE 4 11 20 8 6 Enabled OFF ON ON ON OFF OFF ON DCE 4 6 8 Disabled ON OFF OFF OFF ON ON OFF DCE 4 6 8 Enabled ON OFF OFF OFF ON ON ON DCE 4 11 20...

Page 11: ...the Control Input signal on the remote Modem This signal is required in half duplex switched carrier environments or in hardware flow control applications Voltage Output Vout The Voltage Output signal is a constant positive voltage that is sent from the Modem to its attached DTE device Carrier Controlled by Cin When Carrier Controlled by Control Input is Enabled the Modem s transmitter is activate...

Page 12: ...r view of Modem showing interface connectors 4 1 Twisted Pair Wiring Overview These short range modems are designed to work in pairs You will need one at each end of a 4 wire twisted pair circuit The pairs must be dry unconditioned metallic wire 19 to 26 AWG The smaller gauges limit distance somewhat compared with larger gauges When you have completed wiring for your data circuit the pin connectio...

Page 13: ... the Modem to make the connection The RJ 11 jack on the Modem is prewired for a standard telco wiring environment To be sure you have the right wiring use the pinout below as a guide RJ 11 SIGNAL 1 GND 2 RCV 3 XMT 4 XMT 5 RCV 6 GND For proper signal crossing between two Modems using RJ 11 connectors wire the twisted pair cable according to the pinout below SIGNAL PIN PIN SIGNAL GND 1 6 GND RCV 2 4...

Page 14: ... of drops data rate wire gauge etc Call Technical Support for specific distance estimates Figure 4 2 shows how to wire the two pair cables properly for an Async Short Haul Modem MP daisychain topology Note that the ground connection is not needed Figure 4 2 Daisychain wiring HOST FIRST SLAVE OTHER SLAVE S XMT RCV RCV XMT RCV RCV RCV XMT XMT RCV XMT XMT In a multipoint topology you must configure t...

Page 15: ...tar wiring HOST FIRST SLAVE SECOND SLAVE XMT RCV RCV XMT RCV RCV RCV XMT XMT RCV XMT XMT In a multipoint topology you must configure the master Modem s DIP switches differently than those of the slave Modems Here are the proper DIP switch settings for a star topology Switch Number 1 2 3 4 5 6 7 Master Positions ON ON ON OFF OFF OFF OFF Slave Positions ON ON ON OFF OFF OFF ON 4 3 RS 232 Connection ...

Page 16: ... connections are correct and the RS 232 device is in an idle state The control in and control out indicators light red for a low signal and green for a high signal The specific pin number associated with these indicators will vary according to the switch settings you have selected see Chapter 3 5 2 Loopback Test Modes Select the test modes by pressing the Loopback Test switch When the Modem is in ...

Page 17: ...appear on your screen the link to the Modem in loopback mode is working NOTE Only the one Modem should be in test mode The other Modem should be in normal operating mode or the test will not work If no characters are echoed back check the wiring between the two Modems Wire the Modems according to the instructions in Chapter 4 Figure 5 1 Loopback Test Modes RD TD TD RD Local 1060 In Normal Mode Rem...

Page 18: ...ptom TD and RD LEDs indicate activity but CD LED is unlit or red should be green Problem 1 Defective twisted pair line Solution 1 Test continuity of the twisted pair line Problem 2 Poor twisted pair connections to Modems Solution 2 Check screw terminal RJ 11 connections to Modems check integrity of plug RJ 11 terminations Symptom Occasional data errors Problem 1 Distance bit rate capacity exceeded...

Page 19: ... No data transfer in either or both directions Problem 1 Improper twisted pair wiring Solution 1 Compare your twisted pair wiring with the diagram in Section 4 1 Problem 2 Improper DCE DTE setting Solution 2 Set both DCE DTE switches alike according to the instructions in Section 3 2 Problem 3 Improper bit rate setting Solution 3 Be sure all bit rate settings on all connected serial ports are the ...

Page 20: ...ge Rate 19 0 9 mm 22 0 5 mm 24 0 4 mm 115 200 1 8 2 9 0 75 1 2 0 38 0 6 57 600 2 5 4 1 3 2 1 0 95 1 5 38 400 3 7 6 1 5 2 4 1 33 2 1 19 200 4 17 6 7 1 9 3 1 1 42 2 3 9600 5 41 8 7 2 6 4 2 2 08 3 3 4800 7 05 11 3 3 8 6 1 2 84 4 6 2400 11 5 18 5 7 11 3 4 83 7 8 1200 14 22 5 8 5 13 7 5 68 9 1 To reduce the potential of difficulties in the field we recommend that the cable used to connect the Modem hav...

Page 21: ...o Send To Modem 5 CTS Clear to Send From Modem 6 DSR Data Set Ready From Modem 7 SG Signal Ground 8 DCD Data Carrier Detect From Modem DIRECTION STANDARD DTE SETTING DIRECTION From Modem Data Term Ready DTR 20 1 FG Frame Ground 2 TD Transmit Data From Modem 3 RD Receive Data To Modem 4 RTS Request to Send From Modem 5 CTS Clear to Send To Modem 6 DSR Data Set Ready To Modem 7 SG Signal Ground 8 DC...

Page 22: ...21 APPENDIX C Block Diagram Appendix C Block Diagram ...

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