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CHAPTER 5: Conversions and Connections

5.4 CODE CONVERSIONS

The conversions used in the standard 2770, 2780, 3741, and 3780 PROMs are shown in the following
charts. Your PROM can be customized. Please call Technical Support if you have particular translation
requirements.

Abbreviations:

Dir. = Direction of Conversion
NP = No pass (no translation in either direction)

Character

ASCII

EBCDIC

Graphic

Hex

Dir.

Hex

Comments

NUL

SOH

STX

ETX

EOT

ENQ

ACK

BEL

16
36

Numeric BS

05
39

Required Tab

Repeat WP

Required Page End

Required CR

Index Return

DLE

DC1

DC2

DC3

DC4

NAK

SYN

ETB (EOB) 17

CAN

SUB

ESC

Character

ASCII

EBCDIC

Graphic

Hex

Dir.

Hex

Comments

IRS EBCDIC

SPACE

40
41

Required Space

Numeric Space

EBCDIC DP

(

)

SYL. Hyphen

;

Содержание PCW22A-R3

Страница 1: ...4 746 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 CUSTOMER SUPPORT INFORMATION AUGUST 1998...

Страница 2: ...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 modific...

Страница 3: ...de aire por los orificios de ventilaci n 10 El equipo el ctrico deber ser situado fuera del alcance de fuentes de calor como radiadores registros de calor estufas u otros aparatos incluyendo amplific...

Страница 4: ...3 6 Cable Requirement 12 3 4 Preparing the A S 2G for Connection to a Synchronous Device 12 3 4 1 Data Terminal Ready DTR Signal Options 12 3 4 2 Clear to Send CTS Signal Options 12 3 4 3 Baud Rate O...

Страница 5: ...Data Format 22 4 2 3 Data Conversion 22 4 2 4 Flow Control 22 4 2 5 Verification of Data Reception 22 4 2 6 Line Turnaround 22 5 0 Conversions and Connections 27 5 1 Transparency Mode of Operation 27...

Страница 6: ...ead in DTE only Synchronous bisynchronous standard BSC handshaking Indicators Unit Power PWR Power LED mounted on Port B side Each Port TXD Transmit Data RXD Receive Data RTS Ready to Send CTS Clear t...

Страница 7: ...on code ASCII Will it operate in TTY format start stop RS 232 7 bit and even odd mark or space parity The A S 2G is equipped with two bidirectional RS 232C ports These ports labeled Port A and Port B...

Страница 8: ...ts to receive an echo of its transmitted data NOTE The A S 2G always operates in half duplex mode on the synchronous side so this option applies only to the asynchronous device Switch 2 ON echo EOT ch...

Страница 9: ...ON 3780 MODE OFF 2770 2780 3741 MODE Switch 7 ON When RAM reaches a nearly full state DTR Pin 20 will be lowered When RAM space is available DTR will be raised to permit transmission to resume Port A...

Страница 10: ...S There are two ways to enter the self diagnostic mode The first method requires that you locate SW2 switch 4 and set it to the ON position When you press the reset switch the A S 2G will display diag...

Страница 11: ...ough position the jumper over the center and right posts The DTR double jumper is located just below and slightly to the right of U28 on the circuit board For normal operation A S 2G signal control pl...

Страница 12: ...onous port Refer to Table 3 1 Port A Asynchronous Baud Rate to determine the position of each switch NOTE The baud rate of the asynchronous port Port A cannot be set externally Do not use the EXT sett...

Страница 13: ...escribed below then plug a male RS 232 connector into the A S 2G s female receptacle Sex change adapters connectors and cable are available if you need them 3 4 1 DATA TERMINAL READY DTR SIGNAL OPTION...

Страница 14: ...Refer to the circuit board layout Figure 5 2 on page 28 To remove or replace a DIP Shunt follow the instructions for installing and replacing PROMs Section 5 2 on page 24 3 4 5 EXTERNAL OR INTERNAL C...

Страница 15: ...be preceded by and terminated by Example Command Commands consist of character pairs Each pair must represent a valid Hexidecimal value i e zero through 9 or A through F Example To send an escape sequ...

Страница 16: ...duplex user selectable with SW2 Switch 3 75 to 9600 bps user selectable by SW1 Switches 1 through 4 ASCII code 4 1 3 DATA CONVERSION The A S 2G converts Asynchronous ASCII data byte for byte to EBCDIC...

Страница 17: ...to the synchronous device with an ETB EBCDIC Hex 26 The last block of asynchronous data must end with a Control D ASCII Hex 04 The A S 2G will send the block adding with an ETX EBCDIC Hex 03 After re...

Страница 18: ...perating in full duplex mode from the asynchronous side SW3 Switches 1 and 2 permit visual assurance of accurate and complete transmission When SW3 Switch 1 is ON the A S 2G will immediately echo back...

Страница 19: ...2 etc last record 26 BCC1 BCC2 FF FF IF 3780 AA AA 32 32 32 32 02 text up to 80 characters with records separated by 1E last record in block 1E 26 BCC1 BCC2 FF FF IF 3741 AA AA 32 32 32 32 02 up to 12...

Страница 20: ...user specified lead Frees up buffer space Echo CR LF Allow resumption of transmission DC1 ASCII 11 Hex or raise DTR Complete block D Send block E Echo all but CR LF X OFF Send block C X ON Send block...

Страница 21: ...F FF NAK AA AA 32 32 32 32 3D FF FF Echo CR LF Send block F Echo all but CR LF Echo CR LF Send block G end with EOT Hex 04 Echo all but CR LF EOT ENQ ENQ Send block F TTD Send block G If data not yet...

Страница 22: ...780 AA AA 32 32 32 32 02 text up to 80 characters IF BCC1 BCC2 etc last record 03 BCC1 BCC2 FF FF IF 3780 AA AA 32 32 32 32 02 text up to 80 characters with records separated by 1E last record in bloc...

Страница 23: ...ters to ASCII Characters are listed in Tables 4 3 and 4 4 below 4 2 4 FLOW CONTROL The input buffer RAM is capable of storing up to a maximum of 1720 characters The synchronous device can continuously...

Страница 24: ...a phone line if the DTR B jumper is set for CNT NOTE The A S 2G will cycle the synchronous DTR lead off for 2 seconds whether the DLE EOT sequence comes from the synchronous or asynchronous side EBCDI...

Страница 25: ...ENQ ENQ Send data block C Unformatted mode successive characters including spaces appear one after another as sent ACK 0 ACK 1 Send block A WAK WAK Send block B ACK 0 when buffer available ACK 1 Send...

Страница 26: ...Send data block E Retransmit block E TTD TTD NAK ACK 0 when available Send block D NAK ACK 1 when correctly received Send block E NAK NAK If data not properly received by A S 2G If data not yet availa...

Страница 27: ...s Device Bisynchronous Device A S 2G Converter Asynchronous Device Send data block F last block EOT ACK 0 Send block F Send C R LF EOT to asynchronous device if SW3 switch 2 is ON Line can now be turn...

Страница 28: ...ronous port The A S 2G software detects the end of incoming asynchronous data in one of two ways 1 Receipt of an ASCII ESC Control D sequence 1B Hex 04 Hex with no other data following for one second...

Страница 29: ...5 1 The RS 232 Interface 1 2 3 4 5 6 7 8 9 10 11 12 13 PROTECTIVE GROUND TRANSMITTED DATA RECEIVED DATA REQUEST TO SEND CLEAR TO SEND DATA SET READY SIGNAL GROUND COMMON RETURN RECEIVED LINE SIGNAL DE...

Страница 30: ...08 16 36 Numeric BS HT 09 05 39 Required Tab LF 0A 25 VT 0B OB FF 0C OC 0A Repeat WP 3A Required Page End CR 0D OD CR 15 CR 06 Required CR CR 1E CR 33 Index Return SO OE OE SI OF OF DLE 10 10 DC1 11 1...

Страница 31: ...2 c 63 83 d 64 84 e 65 85 f 66 86 g 67 87 h 68 88 i 69 89 j 6A 91 k 6B 92 l 6C 93 m 6D 94 n 6E 95 Character or ASCII EBCDIC Graphic Hex Dir Hex Comments o 6F 96 p 70 97 q 71 98 r 72 99 s 73 A2 t 74 A3...

Страница 32: ...CD EC 5 5 PRINTED CIRCUIT BOARD LAYOUT Figure 5 2 Printed Board Circuit Layout TXD A RXD A RTS A CTS A DTR A DSR A CDA A CDB TXD B RXD B RTS B CTS B DTR B DSR B TXC B RXC B PWR ON SW3 1 8 ON SW2 1 8...

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