169 * that will be executing the MB transaction |
169 * that will be executing the MB transaction |
170 * requested by flag exec_req has already been activated. |
170 * requested by flag exec_req has already been activated. |
171 * -> will be reset once the MB transaction has completed |
171 * -> will be reset once the MB transaction has completed |
172 */ |
172 */ |
173 u16 flag_exec_started; |
173 u16 flag_exec_started; |
174 /* flag that will be mapped onto a (WORD) located variable |
174 /* flag that will be mapped onto a (BYTE) located variable |
175 * (u16 because the flag is a word! ) |
175 * (u8 because the flag is a BYTE! ) |
176 * -> MSByte will store the result of the last executed MB transaction |
176 * -> will store the result of the last executed MB transaction |
177 * 1 -> error accessing IP network, or serial interface |
177 * 1 -> error accessing IP network, or serial interface |
178 * 2 -> reply received from server was an invalid frame |
178 * 2 -> reply received from server was an invalid frame |
179 * 3 -> server did not reply before timeout expired |
179 * 3 -> server did not reply before timeout expired |
180 * 4 -> server returned a valid Modbus error frame |
180 * 4 -> server returned a valid Modbus error frame |
181 * -> if the MSByte is 4, the LSByte will store the MB error code returned by the server |
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182 * -> will be reset (set to 0) once this MB transaction has completed sucesfully |
181 * -> will be reset (set to 0) once this MB transaction has completed sucesfully |
183 * |
182 * |
184 * In other words, this variable will be set from the current status of the |
183 * In other words, this variable is a copy of tn_error_code, reset after each request attempt completes. |
185 * mb_error_code and tn_error_code flags after each request. |
184 * We map this copy (instead of tn_error_code) onto a located variable in case the user program decides |
186 */ |
185 * to overwrite its value and mess up the plugin logic. |
187 u16 flag_exec_status; |
186 */ |
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187 u8 flag_tn_error_code; |
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188 /* flag that will be mapped onto a (BYTE) located variable |
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189 * (u8 because the flag is a BYTE! ) |
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190 * -> if flag_tn_error_code is 4, this flag will store the MB error code returned by the MB server in a MB error frame |
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191 * -> will be reset (set to 0) once this MB transaction has completed succesfully |
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192 * |
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193 * In other words, this variable is a copy of mb_error_code, reset after each request attempt completes. |
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194 * We map this copy (instead of mb_error_code) onto a located variable in case the user program decides |
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195 * to overwrite its value and mess up the plugin logic. |
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196 */ |
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197 u8 flag_mb_error_code; |
188 } client_request_t; |
198 } client_request_t; |
189 |
199 |
190 |
200 |
191 /* The total number of nodes, needed to support _all_ instances of the modbus plugin */ |
201 /* The total number of nodes, needed to support _all_ instances of the modbus plugin */ |
192 #define TOTAL_TCPNODE_COUNT %(total_tcpnode_count)s |
202 #define TOTAL_TCPNODE_COUNT %(total_tcpnode_count)s |