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plc serial -27.11
R6:1/EN ACB Channel 0
Control R6:1
GEQ Source A R6:1.POS Source B 2 ARL Channel 0 Dest ST10:0 Control R6:0
Length 2
R6:0/DN ACN
StringA ST10:1 StringB ST10:0 Dest ST10:2
AWT
ST10:1 = "HI " Channel 0
String ST10:2 Length 7

Figure 27.9 An ASCII String Example

The ASCII functions can also be used to support simple number conversions. The example in Figure 27.10 will convert the strings in ST9:10 and ST9:11 to integers, add the numbers, and store the result as a string in ST9:12.

plc serial -27.12

Figure 27.10 A String to Integer Conversion Example

Many of the remaining string functions are illustrated in Figure 27.11. When A is true the ABL and ACB functions will check for characters that have arrived on channel 1, but have not been retrieved with an ARD function. If the characters "ABC"have arrived ( is an ASCII carriage return) the ACB would count the three characters, and store the value in R6:0.POS.The ABL function would also count the and store a value of four in R6:1.POS.If B is true, and the string in ST9:0 is "ABCDEFGHIJKL", then "EF" will be stored in ST9:1. The last function will compare the strings in ST9:2 and ST9:3, and if they are equal, output O:001/2 will be turned on.

plc serial -27.13
A ACB
Channel 1
Control R6:0
ABL
Channel 1
Control R6:1
B AEX
Source ST9:0
Index 5
Length 2
Dest ST9:1
ASR O:001/2
StringA ST9:2
StringB ST9:3

Figure 27.11 String Manipulation Functions

The AHL function can be used to do handshaking with a remote serial device.

27.3 PARALLEL COMMUNICATIONS

Parallel data transmission will transmit multiple bits at the same time over multiple wires.

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