7 Application Instructions API 50-99 4. Corresponding table between COM ports and communication settings/status. DVP-PLC APPLICATION MANUAL 7-110 COM1 COM2 COM3 Function Description M1138 M1120 M1136 Retain communication setting Protocol M1139 M1143 M1320 ASCII/RTU mode selection setting D1036 D1120 D1109 Communication protocol D1121 D1121 D1255 PLC communication address - M1161 - 8/16 bit mode selection - M1121 - Indicate transmission status Sending M1312 M1122 M1316 Sending request request - M1126 - Set STX/ETX as user/system defined. (RS) - M1130 - Set STX/ETX as user/system defined.
(RS) - D1124 - Definition of STX (RS) - D1125 - Definition of ETX1 (RS) - D1126 - Definition of ETX2 (RS) D1249 D1129 D1252 Communication timeout setting (ms) - D1122 - Residual number of words of transmitting data Sending - D1256 ~ D1295 - Store the sent data of MODRW instruction. request - D1089 ~ D1099 - Store the sent data of MODRD / MODWR / FWD / REV / STOP / RDST / RSTEF instruction M1313 M1124 M1317 Data receiving ready - M1125 - Communication ready status reset - M1128 - Transmitting/Receiving status Indication - D1123 - Residual number of words of the receiving data Data - D1070 ~ D1085 - Store the feedback data of Modbus communication. RS instruction is not supported.
Receiving D1167 D1168 D1169 Store the specific end word to be detected for executing interrupts I140/I150/I160 (RS) M1314 M1123 M1318 RS communication data receiving completed M1314 M1127 M1318 The sending / receiving of communication data is complete. Receiving - M1131 - ON when data is being converted from ASCII to Hex completed - D1296 ~ D1311 - Store the converted HEX data of MODRW instruction.