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Black Box PCW22A-R4 - page 1
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500 ) FREE 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 CUSTOMER SUPPORT INFORMATION A UGUST 1 ...
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Black Box PCW22A-R4 - page 2
FCC ST A TEMENT 1 FEDERAL COMMUNICA TIONS COMMISSION AND INDUSTR Y CANADA RADIO FREQUENCY INTERFERENCE ST A TEMENTS This equipment generates, uses, and can radiate radio frequency energy and if not installed and used properly , that is, in strict accordance with the manufacturer’ s instructions, may cause inter ference to radio communication. It ...
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Black Box PCW22A-R4 - page 3
PROTOCOL CONVER TER A/S-2G 2 INSTRUCCIONES DE SEGURIDAD (Normas Oficiales Mexicanas Electrical Safety Statement) 1. Todas las instrucciones de seguridad y operación deberán ser leídas antes de que el aparato eléctrico sea operado. 2. Las instrucciones de seguridad y operación deberán ser guardadas para referencia futura. 3. Todas las adverten ...
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Black Box PCW22A-R4 - page 4
T ABLE OF CONTENTS 3 T able of Contents 1.0 Specifications .......................................................................................................................................5 2.0 Introduction ......................................................................................................................................... ...
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Black Box PCW22A-R4 - page 5
PROTOCOL CONVER TER A/S-2G 4 4.2 Synchronous Device to Asynchronous Device ........................................................................22 4.2.1 Line Control ...............................................................................................................22 4.2.2 Synchronous Input Data Format ............................... ...
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Black Box PCW22A-R4 - page 6
CHAPTER 1: Specifications 5 1.0 Specifications Protocol — Asynchronous: TTY (ASCII) Bisynchronous: 2770, 2780, 3741, and 3780 (EBCDIC) Por ts — A: Asynchronous B: Synchronous/bisynchronous Speed — Up to 19.2 Kbps (each port independent) Interface — RS-232 (both ports) Connectors — (2) DB25 (female) Flow Control — Asynchronous: X-ON/X-OF ...
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Black Box PCW22A-R4 - page 7
PROTOCOL CONVER TER A/S-2G 6 2.0 Introduction The Model A/S-2G provides compatibility between an asynchronous, ASCII coded device and a synchronous, EBCDIC coded device. It is desirable, prior to installation, to review the following checklist to ensure the appropriateness of all the devices in the system for the planned application. Synchronous (B ...
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Black Box PCW22A-R4 - page 8
CHAPTER 3: Installation 7 3.0 Installation 3.1 UNP ACKING AND INSPECTION After unpacking the A/S-2G, inspect it for shipping damage. Should there be any noticeable damage, save the cartons and contact the carrier who delivered the box to place a freight damage claim. T o open the A/S-2G, take out the four screws from the bottom. Lift off the cover ...
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Black Box PCW22A-R4 - page 9
PROTOCOL CONVER TER A/S-2G 8 Block size for the 2770/2780 is normally limited to 160, but block size is 400 if the 2770/2780 has the Multiple Record T ransmission. Block size for the 3780 is 512. Switch #4 ON = sends CR LF (Carriage Return, Line Feed) to asynchronous device immediately after each logical end of block character (ETB, or ETX) is rece ...
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Black Box PCW22A-R4 - page 10
CHAPTER 3: Installation 9 Switch #4 ON = Self-Diagnostics Mode. OFF = Normal Operation. Switch #5, #6 —Block Size Specification. 56 OFF OFF 80 Characters OFF ON 128 Characters ON OFF 256 Characters ON ON 512 Characters NOTE For 3741, set SW3, Switch #5: OFF (Fixed length)SW2, Switch #5: OFF, and Switch #6: OFF (128 character block) Switch #7, #8 ...
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Black Box PCW22A-R4 - page 11
PROTOCOL CONVER TER A/S-2G 10 NOTE Self-diagnostics will normally display the switches as they are set on the printed circuit board. If the switches were reconfigured (see Section 3.2.4), the switches will be displayed as they are set in the software. 3.2.4 RECONFIGURE SWITCH MODE T o enter the Reconfigure Switch Mode, a terminal must be connected ...
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Black Box PCW22A-R4 - page 12
CHAPTER 3: Installation 11 If SW3, Switch #7 is ON, the A/S-2G will drop DTR when only 32 character spaces remain in the buffer . The A/S-2G will reassert DTR as soon as there are at least 33 character spaces available. For most applications, it is best to configure SW3, Switch #7 ON. If SW3, Switch #7 is OFF , the A/S-2G does not use DTR to contro ...
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Black Box PCW22A-R4 - page 13
PROTOCOL CONVER TER A/S-2G 12 3.3.5 CARRIER OPTIONS If the carrier detect signal is to be driven by the A/S-2G configuration (DCE), the jumper labeled CAR A ENB must be installed. CAR A ENB is located below U20. Refer to the printed circuit board, Figure 5-2, on page 28. The carrier control jumper , CARR A, in between U18 and U19 on the circuit boa ...
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Black Box PCW22A-R4 - page 14
CHAPTER 3: Installation 13 there is data to be transmitted. Once the A/S-2G receives CTS from the attached device, it will transmit the data. When the synchronous port (Port B) is configured as DTE, the CTS B jumper must be placed over the CNT position. Place the CTS B jumper over the CNT position when Port B is configured as DCE. 3.4.3 BAUD RA TE ...
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Black Box PCW22A-R4 - page 15
PROTOCOL CONVER TER A/S-2G 14 3.4.8 COMMAND P ASS-THRU T o use the command pass-thru feature, the command must 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: T o send an escape s ...
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Black Box PCW22A-R4 - page 16
CHAPTER 4: Operation 4.0 Operation By its nature, a protocol converter must operate differently in each direction, since it is communicating with separate devices. Therefore, its operation will be discussed separately for asynchronous to synchronous operation and for synchronous to asynchronous. 4.1 ASYNCHRONOUS DEVICE TO SYNCHRONOUS DEVICE 4.1.1 L ...
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Black Box PCW22A-R4 - page 17
PROTOCOL CONVER TER A/S-2G 16 In 3741 protocol, each block contains only one record. If SW3, Switch #5 is OFF , the A/S-2G will fill the block with spaces until it reaches 128 characters . If SW3, Switch #5 is ON, the block will end immediately after CR. NOTE: • If SW3, Switch #3 is OFF , then one character of the total count must be allotted to ...
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Black Box PCW22A-R4 - page 18
CHAPTER 4: Operation 17 If SW3, Switch #7 is OFF , the A/S-2G will send an X-OFF (ASCII DC3, 13 Hex) to the asynchronous device when RAM reaches a nearly-full state. This prevents data from being lost due to a buffer overrun. When RAM space is available, the A/S-2G will send an X-ON (ASCII DC1, 11 Hex) to resume transmission. Alternatively , if SW3 ...
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Black Box PCW22A-R4 - page 19
PROTOCOL CONVER TER A/S-2G 18 Data Flow — A/S-2G to Synchronous Device Bisynchronous Device A/S-2G Converter Asynchronous Device *Assumes block size of 80 is selected. IF 2270 - 2780 AA AA 32 32 32 32 02 (text up to 80 characters), IF , BCC1, BCC2; etc. (last record 26, BCC1, BCC2, FF FF IF 3780 AA AA 32 32 32 32 02 (text up to 80* characters wit ...
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Black Box PCW22A-R4 - page 20
CHAPTER 4: Operation 19 Data Flow — A/S-2G to Synchronous Device Bisynchronous Device A/S-2G Converter Asynchronous Device ACK 1 NAK Negative Acknowledgment AA AA 32 32 32 32 3D FF FF ACK 0 WA K AA AA 32 32 32 32 6B FF FF Holds up transmission while buffer clears DC3 (ASCII 13 Hex) or drop DTR CTS or user -specified lead Frees up buffer space. (E ...
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Black Box PCW22A-R4 - page 21
PROTOCOL CONVER TER A/S-2G 20 Data Flow — A/S-2G to Synchronous Device Bisynchronous Device A/S-2G Converter Asynchronous Device WA K ACK 1 ACK 0 AA 32 32 32 32 02 2D FF 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 TT ...
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Black Box PCW22A-R4 - page 22
CHAPTER 4: Operation 21 Data Flow — A/S-2G to Synchronous Device Bisynchronous Device A/S-2G Converter Asynchronous Device *Assumes block size of 80 is selected. IF 2270 - 2780 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 reco ...
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Black Box PCW22A-R4 - page 23
PROTOCOL CONVER TER A/S-2G 22 4.2 SYNCHRONOUS DEVICE TO ASYNCHRONOUS DEVICE 4.2.1 LINE CONTROL When the A/S-2G is initially connected to an AC power source or reset, the synchronous device can gain control of the line by sending an ENQ. When the asynchronous side has control of the line, a turnaround cannot occur until an “End of T ransmission” ...
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Black Box PCW22A-R4 - page 24
CHAPTER 4: Operation 23 Should the A/S-2G receive a DLE EOT (disconnect), the A/S-2G will cycle the synchro-nous DTR lead off for 2 seconds. This action will disconnect 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 as ...
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Black Box PCW22A-R4 - page 25
PROTOCOL CONVER TER A/S-2G 24 Data Flow — A/S-2G to Asynchronous Device Bisynchronous Device A/S-2G Converter Asynchronous Device ENQ Send data block A Send data block B 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 WA K WA K Send block B ACK 0 (whe ...
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Black Box PCW22A-R4 - page 26
CHAPTER 4: Operation 25 Data Flow — A/S-2G to Asynchronous Device Bisynchronous Device A/S-2G Converter Asynchronous Device Send data block D Send data block D 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 ...
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Black Box PCW22A-R4 - page 27
PROTOCOL CONVER TER A/S-2G 26 Data Flow — A/S-2G to Asynchronous 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 turned around or A/S-2G in idle mode Line release or turnaround ...
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Black Box PCW22A-R4 - page 28
CHAPTER 5: Conversions and Connections 27 5.0 Conversions and Connections 5.1 TRANSP ARENCY MODE OF OPERA TION With a special transparency PROM installed, the A/S-2G will communicate with a host system in IBM binary synchronous transparent mode. T o special-order the transparency PROM, please call technical support. In transparent mode, no characte ...
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Black Box PCW22A-R4 - page 29
PROTOCOL CONVER TER A/S-2G 28 5.3 RS-232 CABLE CHAR T RS-232C pins are defined as follows: 1 = Chassis (or Frame or Protective) Ground F-GND, C-GND, or P-GND 2 = T ransmit Data TD or TXD 3 = Receive Data RD or RXD 4 = Request to Send R TS 5 = Clear to Send CTS 6 = Data Set Ready DSR 7 = Signal Ground S-GND 8 = Carrier Detect CD 15 = T ransmit Signa ...
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Black Box PCW22A-R4 - page 30
CHAPTER 5: Conversions and Connections 29 5.4 CODE CONVERSIONS The conversions used in the standard 2770, 2780, 3741, and 3780 PROMs are shown in the following charts. Y our PROM can be customized. Please call T echnical Support if you have particular translation requirements. Abbreviations: Dir . = Direction of Conversion NP = No pass (no translat ...
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Black Box PCW22A-R4 - page 31
PROTOCOL CONVER TER A/S-2G 30 Character or ASCII EBCDIC Graphic Hex Dir. Hex Comments @4 0 7 C A4 1 C 1 B4 2 C 2 C4 3 C 3 D4 4 C 4 E4 5 C 5 F4 6 C 6 G4 7 C 7 H4 8 C 8 I4 9 C 9 J4 A D 1 K4 B D 2 L4 C D 3 M4 D D 4 N4 E D 5 O4 F D 6 P5 0 D 7 Q5 1 D 8 R5 2 D 9 S5 3 E 2 T5 4 E 3 U5 5 E 4 V5 6 E 5 W5 7 E 6 X5 8 E 7 Y5 9 E 8 Z5 A E 9 5B 4A 5B AD 5C E0 5D ...
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Black Box PCW22A-R4 - page 32
CHAPTER 5: Conversions and Connections UNASSIGNED EBCDIC CODE 04 2B 46 58 71 8D AB B7 CE ED 08 30 47 59 72 8E AC B8 CF EF 09 31 48 62 73 8F AE B9 DA FA 17 34 49 63 74 90 AF BA DB FB 1A 38 51 64 75 9A B0 BB DC FC 20 3B 52 65 76 9C B1 BC DD FD 21 3E 53 66 77 9D B2 BE DE FE 23 42 54 67 78 9E B3 BF DF FF 24 43 55 68 80 9F B4 CB EA 28 44 56 69 8A A0 B5 ...
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Black Box PCW22A-R4 - page 33
1000 P ark Drive • Lawrence, P A 15055-1018 • 724-746-5500 • F ax 724-746-0746 © Copyright 1998. Black Box Corporation. All rights reserved. ...
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