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Moxa Technologies A51 - page 1
A50/A51/ A60 Feb. 1997 ( 1st Ed ition ) All Right s Reser ved ...
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Moxa Technologies A51 - page 2
Part I - A50/A51 RS-232 to RS-422/RS-485 Converte r A50/A51 RS-232 t o RS-422/ RS-485 Bidirecti onal Co nverter ...
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Moxa Technologies A51 - page 3
Part II - A60 RS-232 Surge Prote ction A60 RS-23 2 Surge P rot ection Conve rt er ...
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Moxa Technologies A51 - page 4
C opyr igh t N ot ic e This doc umentation is c opyri ghte d by Mo xa T ech n olo gies Co ., Lt d. All rig hts a re re ser ved . M oxa Tech n olo gies r eser ves t he right to m ake improvements to the p rod u cts de scri bed i n t his manual at any time without notice. Info rmation pro vi de d in this manual is inte n ded to be acc urate and relia ...
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Moxa Technologies A51 - page 5
M o x a I n t e r n e t S e r v i c e s Customer’ s satisfactio n is al ways ou r number o ne c once rn . To ens ure c ust omers get the full bene fit o f ou r ser vices, M oxa In ter net Ser vices (M IS) ha ve bee n built f or tech nical su p po rt, pr o duct i nq uiry, new d rive r up gr ade , etc. The follo win gs are t he se rvices we p ro vi ...
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Moxa Technologies A51 - page 6
Table o f Conte nt s Part I - A50/A51 RS-232 t o RS-42 2/RS-485 Converter Chapter 1. Introduction ………………………………………. 1 1.1 Overview 1 1.2 Features and Specifications 2 1.3 Package Check List 5 Chapter 2. Instal lation ………………………………… …….. 7 2.1 Installation Procedure 7 2.2 Switch Function Desc ...
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Moxa Technologies A51 - page 7
Table o f Conte nt s Part II - A60 RS-23 2 Surge Protection Chapter 1. Introduction…………………………………… ……… 29 1.1 Overview 30 1.2 Features and Specifications 30 1.3 Package Check List 31 Chapter 2. Instal lation…………………………… ………………… 33 2.1 Installation Procedure 33 2.2 LED Indicators 34 ...
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Moxa Technologies A51 - page 8
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Moxa Technologies A51 - page 9
1 Ch ap te r 1 I nt ro du ction 1. 1 O ve rv ie w The MOXA RS-232 to RS-422/RS-48 5 bidirectional con verters, A50 and A51, are designed to con vert unbalanced (single-ended) RS-232 signals to balanced (differential) RS-422/RS-485 signals, and vice versa. They are the best choices for those who want to control devices at longer d istance and/or to ...
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Moxa Technologies A51 - page 10
Introduction Chapter 1 2 Outlook of A51 1. 2 Fe atur es an d Spe ci fi c at i ons Features Both A50 and A51 are RS-232 t o RS-42 2/RS-485 bidirectional converters except that A51 has one more f eature: isolation protection, which pr ovides hi gh v oltage protection up to 20 00V. All the switches, SW1 and SW2, of A50/A5 1 are designed to be inside o ...
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Moxa Technologies A51 - page 11
Chapter 1 Introduction 3 150mA power adapter or the pin 6 and pin 7 of t he Term inal Block. LED indicators are provided to show the status of data trans mitting/receiving, RTS signal and Power. To avoid over-current from the remot e ground t o con verter's groun d, an pro tect resistor has been added inside the A50/A51. Specifi cations v Powe ...
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Moxa Technologies A51 - page 12
Introduction Chapter 1 4 v Isolation Protection - for A51 o nl y, up t o 2 000V. v Ter minal R esistor - RT1 space r eserv ed for RS-422/RS-485 receiver signal. v Mountin g Kit - Plastic Plates and scre ws for mounting A50/A51 o n the wall or any surface. A5 0/A 5 1 with M ou ntin g Ki t RS -4 22 /485 RS -2 32 C o nver te r R S - 2 3 2to R S - 4 2 ...
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Moxa Technologies A51 - page 13
Chapter 1 Introduction 5 1.3 Package Check List Upon un packing y our A5 0 or A5 1 package, yo u shou ld fin d the following items: v A50 (or A51) RS-2 32 t o RS-42 2/RS-485 bidirectional converter (with isolation protection if A51) v One power adapter v Mountin g Kit v A50/A51/A60 User's Manual ...
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Moxa Technologies A51 - page 14
Introduction Chapter 1 6 ...
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7 Ch ap te r 2 In st al l atio n 2.1 Installation Proced u re As RS-232 or RS-42 2/RS-485 port are labeled clearly on the surface of the A50/A51 converter, please prepare the RS-232 cable (ref er to Appendix A, RS-23 2 Cable Wiring) an d decide the operation mode as w ell as 2/4-wire c able (refer to Chapter 3, Operation) in advance. Take off the t ...
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Moxa Technologies A51 - page 16
Chapter 2 l l Installation 8 Switch settings table of SW1 and SW2 is as foll ows: SW1 *F ull-d u plex mode Of f Half- du plex mode On SW2 Pin1 Pin2 Pin3 Pin4 *T xD always en able d On Of f X X TxD always disable d Of f Of f X X TxD ena bled by RT S Of f On X X * Rx D al ways ena bled X X On Of f RxD e na bled b y /RTS X X Of f On Note: ‘ * ‘ me ...
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Moxa Technologies A51 - page 17
Installat ion l l Chapter 2 9 RxD indicator stands for data trans mitting from RS-422/RS-485 to RS-232. It shows red when connected and no data received. It shows orange when connected and receiving data (In half- duplex mode, it shows red when line is not co nnected due to t he charact eristics of IC s for RS-485). RTS indicator is for RS-232 RTS ...
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Moxa Technologies A51 - page 18
Chapter 2 l l Installation 10 A50/A51 A50/A51 RJ-45 Jack Terminal Block Connector Pinouts Signals Connector Pinouts Signals 1 nc 1 TxD B 2 nc 2 TxD A 3 GND 3 RxD B 4 TxD B 4 RxD A 5 TxD A 5 GND 6 RxD A 6 Power GND 7 RxD B 7 Power Input 8 GND 9 nc 10 nc (not connec ted) Note : Pin 6 and Pin 7 of Terminal Block are for Power GND and Power Input, whic ...
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Moxa Technologies A51 - page 19
~ 11 ~ Ch ap te r 3 O pe r at ion The A50 (or A51) su pports 5 ki nds of operations. The y are: v Point-to-p oint/ 4-wire Full Duplex v Point-to-p oint/ 2-wire Half Duplex v Multidrop/ 4-wire Full Duplex v Multidrop/ 2-wire Half Duplex v Si mplex/Trans mit, Re ceive Only All the operations are to be described below. And TA, TB, RA and RB represent ...
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Moxa Technologies A51 - page 20
Chapter 3 l l Operation 12 3.1 Point-to-point Point-to-p oint co nfiguration me ans two devices which locat e at two different places c an be linked to gether to com municat e throug h a couple of A50 (or A5 1) converters. 4-wire Full Duplex In the graph, TA, TB, RA and RB could be either from RJ-45 or Ter minal Block. The settings of the switches ...
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Moxa Technologies A51 - page 21
Operation l l Chapter 3 13 2-wire Ha lf Duplex In the graph, TA, TB, RA and RB could be either from RJ-45 or Ter minal Block. The settings of the switches for ea ch A50 (or A51) are as follows: SW1 SW2 Pin1 Pin2 Pin3 Pin4 Half- d uple x mode On Tx D e nable d by RTS Of f On X X RxD ena bled by / RT S X X Of f On A 50 /A51 RA RB RS -232 TB TA GND D ...
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Moxa Technologies A51 - page 22
Chapter 3 l l Operation 14 3.2 Multid rop Multidrop config uration means that mor e than two devices (Max. 10 for RS-422; Max. 32 for RS-485 ) can be lin ked all together to com muni cate one another through many A50 (or A51) devices. In this configu ration, one of t he A50 (or A5 1) will be connected to a m aster devic e and the rest of A50 (or A5 ...
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Moxa Technologies A51 - page 23
Operation l l Chapter 3 15 In the graph, TA, TB, RA and RB could be either from RJ-45 or Ter minal Blocks. The settings of the switche s for each A50 (or A51) are as follows: SW1 Full-duplex mode Off SW 2 fo r Master Pin1 Pin2 Pin3 Pin4 Tx D always e na bled On Of f X X RxD always e nable d X X On Of f SW 2 fo r Sla ves Pin1 Pin2 Pin3 Pin4 Tx D e n ...
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Moxa Technologies A51 - page 24
Chapter 3 l l Operation 16 A 5 0 /A 51 RA RB R S -2 32 TB TA GN D A 5 0 /A 51 RS - 23 2 RA TB RB TA GN D M ast er DT E / DC E A 5 0 /A 51 RA RB R S -2 32 TB TA GN D R S - 48 5 R S- 48 5 RS -4 85 Sla ve DT E/ DC E Sla ve DT E/ DC E ...
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Moxa Technologies A51 - page 25
Operation l l Chapter 3 17 In the graph, TA, TB, RA and RB could be either from RJ-45 or Ter minal Block. The settings of the switches for ea ch A50 (or A51) are as follows: SW1 SW2 Pin1 Pin2 Pin3 Pin4 Half- d uple x mode On Tx D e nable d by RTS Of f On X X RxD ena bled by / RT S X X Of f On 3.3 Simplex/Transmit, Receive Si mplex configuration mea ...
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Moxa Technologies A51 - page 26
Chapter 3 l l Operation 18 In the graph, TA, TB, RA and RB could be either from RJ-45 or Ter minal Block. The settings of the switches for ea ch A50 (or A51) are as follows: SW1 SW2 Pin1 Pin2 Pin3 Pin4 Full- du plex mode Of f Tx D always e na bled On Of f X X RxD always e nable d X X On Of f A 50/A51 RA RB RS -42 2/ R S-232 T B RS-485 TA GND D TE / ...
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Moxa Technologies A51 - page 27
Operation l l Chapter 3 19 3.4 Self Test This configuration is for A50/A5 1 self test. Run ter minal e mulation program to se e if what yo u received is what yo u ty ped. In the graph, TA, TB, RA and RB could be either from RJ-45 or Ter minal Block. The settings of the switches for ea ch A50 (or A51) are as follows: SW1 SW2 Pin1 Pin2 Pin3 Pin4 Half ...
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Moxa Technologies A51 - page 28
Chapter 3 l l Operation 20 ...
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Moxa Technologies A51 - page 29
~ 21 ~ Ap pe nd ix A RS -23 2 Pi n out s & C ab le Wi r in g RS-232 interface with RJ-45 connector is depicted as follows. RJ - 45 C on nect or A50/A51 RJ-45 Connector Pinouts RS-232 Signals 1 DCD Alwa ys On 2 DSR 3 RTS 4 GND 5 TxD 6 RxD 7 GND 8 CTS 9 DTR 10 - 1 2 3 4 5 6 7 8 9 10 ...
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Moxa Technologies A51 - page 30
Appendix A l l RS-232 Pinou ts and Cable Wiring 22 Note : Each group of (RTS, CTS) and (DTR, DSR) pins have been shorted on A50/A51, which release the users fro m the hardware flow control cable wiring problem. Thus, there are two types of RS-23 2 cable wiring which are listed below. Type 1 : To connect RS-232 si de of A50/A51 to a DTE (e.g. PC COM ...
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Moxa Technologies A51 - page 31
RS-23 2 Pinout s and Cable Wiring l l Appendix A 23 A50/ A51 DCE RJ-45 Connector DB-25 Femal e 1 DCD 8 DCD 2 DSR 6 DTR 3 RTS 4 CTS 5 TxD 2 RxD 6 RxD 3 TxD 7 GND 7 GND 8 CTS 5 RTS 9 DTR 20 DSR Type 2: To connect RS-232 side of A50/A5 1 to a DTE, e.g. ter minal or PC COM1/2, with 3-pin wiring if d on't care H ardware flow control. A50/A51 DTE A5 ...
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Moxa Technologies A51 - page 32
Appendix A l l RS-232 Pinou ts and Cable Wiring 24 A50/ A51 DCE RJ-45 Connector DB-25 Femal e 5 TxD 2 RxD 6 RxD 3 TxD 7 GND 7 GND 3 RTS 4 CTS 8 CTS 5 RTS 2 DSR 6 DTR 9 DTR 20 DSR 1 DCD 8 DCD ...
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Moxa Technologies A51 - page 33
~ 25 ~ A p p e n d i x B I m p e d a n c e Ma t c h i n g a n d Te r mi n a ti o n R es is t or s When an electrical signal travel s through two different resistanc e junctions in a transmi ssion line, the mism atch will so metimes c ause signal refle ction. Signal reflection causes signal distortion , which in tu rn will contrib ute com munication ...
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Moxa Technologies A51 - page 34
Appe ndi x B l l Impe d ance M atching a nd Termi natio n Resistors 26 Note: 1. stan ds for termination resistor near the re ceiving side. RT1 is the space res erved inside A50/A51 for this purp ose. 2. The suggested ter mination resistor for AWG #26 cable is 100 ohm. 3. The suggested ter mination resistor for phone cable is 600 ohm. ...
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Moxa Technologies A51 - page 35
~ 27 ~ Ap pendi x C Troubleshooting Q1. Failure of dat a trans mission. Solutions: 1. Check that the right p ower adapter is applied. 2. Check that the RS-232 lin k is pro per. 3. Check that the RS-422/RS-48 5 lin k is proper. 4. Check that the SW1 and SW2 are set properly . Q2. Dat a los s or e rror. Solution: Check that the data rate, data for m ...
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Moxa Technologies A51 - page 36
Appendix C l l Trouble shooting ~ 28 ~ ...
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Moxa Technologies A51 - page 37
~ 29 ~ Cha pter 1 Introduction 1.1 Overview The MOXA RS-232 Surge Protection con verter, A60, is designed to pr otect the RS-232 com munication line from TOV (Transient Over Voltages) whi ch co mes fro m lightning, electrostati c discharge and other form s. TOV is al ways the m ajor factor which da m ages co mponents and make s ports unreliable. To ...
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Moxa Technologies A51 - page 38
Chapter 1 • • Introduction ~ 30 ~ 1.2 Features and Spe cifications Features A60's m ain feature is surge protection up to 2 000V. No switch is needed. No power is needed. LED indicators are provided to show the status of data trans mitting/receiving, modem control signals and DCD. Specifications v RS-232 RJ-45 Co nnectors : supp orts TxD, ...
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Moxa Technologies A51 - page 39
Introduction • • Chapter 1 ~ 31 ~ A6 0 wit h Mo untin g Kit 1.3 Package Check List Upon un packing y our A6 0 package, yo u sho uld fin d the following items: v A60 RS-232 surge protection co nverter v Mountin g Kit v A50/A51/A60 User's Manual M ou nting Scr ew Fi xi ng S cr ew T X D R X D R T S P W R Remote Lo cal P ro tecti on A 6 0 R S ...
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Moxa Technologies A51 - page 40
Chapter 1 • • Introduction ~ 32 ~ ...
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Moxa Technologies A51 - page 41
~ 33 ~ hapte r 2 Installati on 2.1 Installation Procedu re Even thou gh t he local and remote ports of A60's ar e labeled on the surface of the A60 converter, please take c are when connecting the cables to the A60 and the hosts. Note that t he surge from both the local and the remote s ite is blocked b y the A60. However , the LED indicators ...
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Moxa Technologies A51 - page 42
Chapter 2 • • Introduction ~ 34 ~ Please prepare the RS-232 cables, referring to Appendix A, RS- 232 Cable Wiring. 2.2 LED Indicators There are LED indicators for TxD, RxD, DTR, DSR, RTS, CTS, and DCD on top of A60. The indicators are not lig hted on when not connected with signals. On t he contrar y, they w ill be lighted on and be one of t he ...
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Moxa Technologies A51 - page 43
Installat ion • • Chapter 2 ~ 35 ~ Rx D indicator ( signal from re mote port ) Gree n : whe n c o nnecte d c or rectly and no data receivin g. Ora n ge : whe n receivin g data fr om remote to local site. DTR/RTS indic ator s (signal from local port) Red : whe n c o nnecte d a nd D TR ( or RTS ) sig nal tu r ned o n. Gree n : whe n c o nnecte d ...
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Moxa Technologies A51 - page 44
Chapter 2 • • Introduction ~ 36 ~ 2.3 Self Test This configuration is for A60 self-test. Run terminal emu lation program to see if what yo u received is what yo u t y ped. In the above grap h, all the signal li nes could be either from re mote sit e RJ-45 or Terminal Block and shorted as shown. P rotec tion A 6 0 R S - 23 2 S ur ge L oc al Remo ...
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Moxa Technologies A51 - page 45
~ 37 ~ ppendix A RS-232 Pinout s and Cable Wirin g Below is RS-232 pino uts for RJ-45 co nnector or Terminal Block. A60 RJ-45 A60 Terminal Block Connector Pinouts Signals Connector Pinouts Signals 1 DCD 1 TxD 2 DSR 2 RxD 3 RTS 3 DTR 4 GND 4 DSR 5 TxD 5 RTS 6 RxD 6 CTS 7 GND 7 GND 8 CTS 9 DTR 10 - A 1 2 3 4 5 6 7 RJ-45 C onnect or T ermi nal B lock ...
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Moxa Technologies A51 - page 46
Appendix A • • RS -232 Pinout s and Cable Wiring ~ 38 ~ There are two types of RS-23 2 cable wiring which are listed below. Note: 1. Ter minal Block supports no DCD signal. 2. DTE: Data Te rm inal Equipm ent like te rmi nal or PC COM1/2 ; DCE: Data Co mm unication Equipment like modem . Pleas e che ck the precise DTE/ DCE pinouts, t he followin ...
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Moxa Technologies A51 - page 47
RS-232 Pinout s and Cable Wiring • • Appendix A ~ 39 ~ DCE A60 DB-25 Femal e DCD 8 DCD DSR 6 DTR RTS 4 CTS TxD 2 RxD RxD 3 TxD GND 7 GND CTS 5 RTS DTR 20 DSR Type 2: To connect RS-232 local/rem ote port of A60 to a DTE with 3-pin wirin g if d on't care hardwar e flow control. DTE DTE A60 DB-25 Male A60 DB-9 Male TxD 3 RxD TxD 2 RxD RxD 2 T ...
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Moxa Technologies A51 - page 48
Appendix A • • RS -232 Pinout s and Cable Wiring ~ 40 ~ DCE A60 DB-25 Femal e TxD 2 RxD RxD 3 TxD GND 7 GND RTS 4 CTS CTS 5 RTS DSR 6 DTR DTR 20 DSR DCD 8 DCD ...
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Moxa Technologies A51 - page 49
ppendix B Troubleshooting Q1. Failure of dat a trans mission. Solutions: Check that the RS-232 lin k is pro per. Q2. Dat a los s or e rror. Solution: 1. Check that the data rate, data for mat are the same for both devices. 2. Surge occurs d uring t he data transferring. Error detection and recovery sh oul d be taken in applications. Q3. How do I do ...
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