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200 DC 900-1340I
BSC Programmer’s Guide
A.4.3 3270 Command Checking
A tributary link scans the incoming data stream for the presence of valid 3270 com-
mands for devices configured either as displays or printers. First, the link checks for the
presence of the escape (ESC) character that precedes each BSC 3270 command. Second,
it checks the 3270 command byte for a valid Read, Write, Copy, or Erase command. If
a bad command is found, line response and status maintained are determined by the
type of command error that occurred as shown in Figure A–6.
Normally, the BSC 3270 master sends EOT when it receives a WACK or RVI response
to a select sequence. If the BSC 3270 master sends a Write or Copy command instead of
EOT, the ICP discards the command, sends EOT to the BSC 3270 master, and sets the
appropriate status bits. Figure A–7 and Figure A–8 show two examples.
Figure A–5: Normal Operation of Virtual Display
Client Freeway
Communication Line
3270 WRITE command byte
select
with start print bit
<EOT>
<ACK0>
<ACK1>
DLI_PROT_SEND_NORM_DATA_EOM
dlRead
pOptArgs.iICPStatus = 0
- BSC Programmer’s Guide 1
- Contents 3
- List of Figures 11
- List of Tables 13
- DC 900-1340I 15 15
- 16 DC 900-1340I 16
- Purpose of Document 17
- Intended Audience 17
- Required Equipment 17
- General Product Overviews 19
- Hardware Support 19
- Other helpful documents: 21
- BSC2780/3780 22
- 24 DC 900-1340I 24
- Introduction 25
- Commercial 26
- Financial 26
- Government 26
- Military 26
- S C A D A 26
- Client Computer 27
- Standard Bus 29
- Industry 29
- 1.3 Embedded ICP Environment 30
- 1.4 Client Operations 30
- 1.5 BSC Product Overview 31
- 1.5.1 Software Description 32
- 1.5.2 Hardware Description 32
- BSC Protocol Summary 33
- 2.1.3 Transmission Codes 34
- 2.2 BSC 3270 Access Modes 35
- 2: BSC Protocol Summary 37
- DC 900-1340I 37 37
- 2.3.1 BSC 2780 Protocol 38
- 2.3.2 BSC 3780 Protocol 39
- 2.3.3 Transmission Codes 40
- DC 900-1340I 43 43
- 44 DC 900-1340I 44
- BSC 3270 DLI Functions 45
- 3.1.4 Buffer Management 49
- 3: BSC 3270 DLI Functions 53
- DC 900-1340I 53 53
- 3.3.1 DLI Optional Arguments 54
- DLI_ICP_ERR_INBUF_OVERFLOW 55
- DLI_ICP_ERR_OUTBUF_OVERFLOW 55
- 56 DC 900-1340I 56
- 3.4.1.5 Start Link Command 60
- 3.4.1.6 Stop Link Command 61
- 3.4.1.10 Send EOT Command 67
- 3.4.2.1 Request Buffer Report 71
- 3.4.2.4 Request Status Report 73
- 74 DC 900-1340I 74
- DLI_PROT_GET_POLL_LIST by 76
- 3.4.3.1 Send Normal Data 79
- 3.4.3.2 Send Transparent Data 79
- DC 900-1340I 81 81
- 82 DC 900-1340I 82
- 84 DC 900-1340I 84
- BSC 3270 Link 85
- 86 DC 900-1340I 86
- DC 900-1340I 87 87
- 4.1 Data Rate Option (1) 88
- • 1 link at 56,000 b/s 88
- • 4–8 links at 19,200 b/s 89
- 4.2 Clock Source Option (2) 89
- 4.5 Protocol Option (5) 90
- 4.6 Parity Option (6) 91
- 4.7 Character Set Option (7) 91
- 4.12 Retry Limit Option (14) 94
- • Poll and select sequences 94
- 4.14.1 RTS Signal 95
- 4.15 Safe Store Option (17) 96
- 4.16 Station ID Option (18) 97
- 4.17.2 Data Blocking 98
- 4.17.3 3270 Command Blocking 98
- DLI_ICP_ERR_BAD_BCC 99
- 4.19 Queue Limit Option (21) 100
- 4.20 Read Session Option (23) 101
- DLI_ICP_ERR_DSR_DOWN error 103
- BSC 2780/3780 105
- DLI Functions 105
- 5.1.4 Buffer Management 109
- DC 900-1340I 113 113
- 5.3.1 DLI Optional Arguments 114
- 116 DC 900-1340I 116
- Input buffer overflow 116
- Output buffer overflow 116
- DC 900-1340I 117 117
- DLI_ICP_ERR_BAD_MODE 118
- DLI_ICP_ERR_BAD_PARMS 118
- DLI_ICP_ERR_LINK_ACTIVE 120
- DLI_PROT_CFG_LINK 120
- 5.4.1.5 Start Link Command 121
- 5.4.1.6 Stop Link Command 122
- DLI_ICP_ERR_MODE_NOT_SAFE 124
- 5.4.1.8 Send EOT Command 125
- DLI_PROT_SEND_EOT. The client 127
- DLI_PROT_SEND_DISC 127
- • reject a signon bid 128
- • reject a signon response 128
- SADL Support 132
- V.25bis Support 133
- AT Support 133
- SADL Modem Configuration 135
- V.25bis Modem Configuration 135
- AT Modem Configuration 135
- Start Trace 136
- Stop Trace 136
- Link Trace Data 136
- 138 DC 900-1340I 138
- 5.4.2.1 Request Buffer Report 140
- 5.4.2.4 Request Status Report 142
- DC 900-1340I 143 143
- DC 900-1340I 145 145
- 5.4.3.1 Send Normal Data 147
- 5.4.3.2 Send Transparent Data 147
- 5.4.3.4 Priority Data 149
- 5.4.3.5 Header Data 149
- • Received data 150
- DC 900-1340I 151 151
- 152 DC 900-1340I 152
- • normal data 153
- • transparent data 153
- DLI_PROT_SEND_TRANS_DATA) 154
- BSC 2780/3780 Link 155
- Configuration Options 155
- 156 DC 900-1340I 156
- DC 900-1340I 157 157
- 158 DC 900-1340I 158
- 6.2.1 External 160
- 6.2.2 Internal 160
- 6.5 Protocol Option (5) 161
- 6.6 Parity Option (6) 161
- 6.7.1 ASCII/LRC-8 163
- 6.7.2 EBCDIC/CRC-16 163
- 6.7.3 ASCII/CRC-16 163
- 6.7.4 EBCDIC/CCITT-0 163
- 6.7.5 ASCII/CCITT-0 163
- 6.13 Retry Limit Option (14) 167
- • Initial line bid (ENQ) 167
- 6.15.1 RTS Signal 169
- 6.15.2 DSR Signal 169
- 6.16 Safe Store Option (17) 170
- Communications LineFreeway 171
- Client Freeway 171
- Communications Line 171
- DRWG-2442 172
- DRWG-2443 172
- 6.17.1 Blocking Disabled 173
- 6.17.2 Data Blocking 173
- 6.19 Queue Limit Option (21) 175
- 6.21 Read Session Option (23) 177
- 6.24 TTD/WACK Option (26) 178
- 6.25 RVI Handling Option (28) 179
- 6.29 Modem Type Option (35) 182
- 6.31 Line Type Option (41) 182
- BSC Link Configuration 183
- Using dlicfg 183
- DC 900-1340I 187 187
- 7.2 DLI Session Configuration 188
- DC 900-1340I 189 189
- 190 DC 900-1340I 190
- DC 900-1340I 191 191
- 192 DC 900-1340I 192
- Control Procedures 193
- BSC 3270 Line 193
- • device status information 194
- • EOT (nothing to send) 194
- A.1.3 Specific Poll 195
- A.3 Line Up/Down Reporting 196
- A.4 Virtual Device Procedures 197
- DLI_PROT_SEND_NORM_DATA_EOM 198
- DLI_PROT_CHANGE_STATUS 198
- DLI_ICP_ERR_DEVICE_BUSY 198
- A.4.3 3270 Command Checking 200
- DLI_ICP_ERR_DEVICE_UNAVAIL 202
- 1 – always a 1 204
- R – reserved 204
- A.5 Station Up/Down Reporting 206
- A.6 DSR/DCD Up/Down Reporting 206
- A.7 Freeway/Line Interface 207
- A.8 Modem Control Lines 207
- A.9 Clock Signals 208
- A.10 Idle Line Condition 208
- BSC 2780/3780 Control 209
- Procedures 209
- DLI_PROT_SET_BUF_SIZE) 210
- B.1.2 Normal Link Start 211
- DLI_PROT_SEND_SIGNON) 215
- DLI_PROT_SEND_NORM_DATA_EOM) 215
- B.1.4 Data Reception 216
- DLI_PROT_SEND_NORM_DATA) 217
- DLI_PROT_RESP_LOCAL_ACK) 217
- B.1.6 Priority Data Reception 218
- (DLI_PROT_SEND_NORM_DATA) 221
- DLI_ICP_ERR_RETRY_EXCEEDED 221
- DLI_ICP_ERR_XMIT_ABORTED 222
- B.1.9 Normal Link Stop 223
- B.2 DSR/DCD Up/Down Reporting 224
- B.3 Freeway/Line Interface 224
- B.4 Modem Control Lines 224
- B.5 Clock Signals 224
- B.6 Idle Line Condition 225
- 226 DC 900-1340I 226
- ASCII Translation Tables 227
- 228 DC 900-1340I 228
- C: ASCII Translation Tables 229
- DC 900-1340I 229 229
- 230 DC 900-1340I 230
- DC 900-1340I 231 231
- 232 DC 900-1340I 232
- Error Codes 233
- 234 DC 900-1340I 234
- Table D– 1: BSC Error Codes 234
- D: Error Codes 235
- DC 900-1340I 235 235
- 236 DC 900-1340I 236
- BSC Loopback Test 237
- 242 DC 900-1340I 242
- BSC Detailed Command and 243
- Response Formats 243
- F.1.2 Set Buffer Size 244
- F.1.3 Link Configuration 244
- F.1.4 Link Enabling (Bind) 244
- F.1.5 Data Transfer 244
- F.1.6 Link Disabling (Unbind) 245
- F.1.7 Session Detach 245
- DLI_ICP_CMD_ATTACH command 248
- F.3 Response Header Format 257
- 258 DC 900-1340I 258
- DC 900-1340I 259 259
- 260 DC 900-1340I 260
- DC 900-1340I 261 261
- 262 DC 900-1340I 262
- DC 900-1340I 263 263
- 264 DC 900-1340I 264
- DC 900-1340I 265 265
- 266 DC 900-1340I 266
- DC 900-1340I 267 267
- 268 DC 900-1340I 268
- Customer Report Form 269
- Protogate, Inc 270
- Customer Service 270
- San Diego, CA 92128 270
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