Chapter 6 Applied Instruction 1812 Symbol: S 1 : Communication port number (1~2) Word S 2 : Source of the data which is sent Word S 3 : Length of the data which is sent Word D 1 : Initial device in which communication data received is stored Word D 2 : Condition of ending the receiving of data Word Explanation: 1. Only applicable for version V1.03 or later versions. 2. If a specific character or specific characters are used as the condition of ending the receiving of data, it is suggested that the instruction should be applied to ASCII data. If the instruction is not applied to ASCII data, it is suggested that a timeout period should be used as the condition of ending the receiving of data.
3. The instruction COMRS only supports the built-in communication ports of an AH500 series CPU module. (COM1 in AHCPU5xx-EN, and COM1 and COM2 in AHCPU5xx-RS2 are supported.) 4. S 1 : Communication port number S 1 =1: COM1 S 1 =1: COM2 If the value in S 1 is neither 1 nor 2, the instruction will not be executed. 5. S 2 : Source of the data which is sent S 3 : Length of the data which is sent If S 2 is D100 and S 3 is K10, the values in the low bytes in D100~D109 will be sent through the communication port specified by S 1 . 6. If the setting value in S 3 is 0, no string will be sent. The maximum number of characters which can be sent is 1000. 7. D 1 :
Length of the data which has been received. D 1 +1~ D 1 +n: Devices in which the data received is stored If D 1 is D200, the value in D 2 is 3, and the value in D 2 +1 is 16#0D0A, the data received will be stored in the low bytes in the devices starting from D201 (the high bytes will be unchanged), the receiving of data will not stop until the consecutive stop characters 16#0D and 16#0A are received, the length of the data received will be written to D200 after 16#0D and 16#0A are received, and a completion flag will be set to ON after the receiving of data stops. 8. D 2 :
Mode of receiving data 6-423 Instruction code Operand Function COMRS S , S , S , D , D 1 2 3 1 2 Sending and receiving communication data Device X Y M S T C HC D L SM SR E K 16# “$” DF S 1 S 2 S 3 D 1 D 2 Pulse instruction 16-bit instruction (11 steps) 32-bit instruction (5 steps) - AH500 -