IDEC DS2_Series - Manual (Page 41)

DS2 series Instruction manual
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l. PNP/NPN output piloting command - 0x4E (‘N’ ASCII)
Turns on and/or turns off the PNP/NPN output.
Host sends:
0x02 0x02 0x4E o 0x03 x
DS2 replies:
0x02 0x01 0x6E 0x03 0x90
where:
o = 1 byte with the PNP/NPN output status (0 off, 1 on)
x = checksum (complement to one of the Length, Type and Data field bytes sum)
m. Analogue output piloting command - 0x4F (‘O’ ASCII)
Sets the analogue output level.
Host sends:
0x02 0x02 0x4F p 0x03 x
DS2 replies:
0x02 0x01 0x6F 0x03 0x8F
where:
p = 1 byte with the analogue output percentage (0 = 0V, 100 = 10V)
x = checksum (complement to one of the Length, Type and Data field bytes sum)
n. A/D Photoelement Conversion Reading Command - 0x50 (‘P’ ASCII)
Reads the result of the A/D conversion for an expansion of 21 photoelements.
Host sends:
0x02 0x02 0x50 e 0x03 x
DS2 replies:
0x02 0x16 0x70 a ….. n 0x03 x
where:
e = 1 byte with the expansion number to read (1 to 21)
a = 1 byte with the result in bit of the conversion for the photoelement 1
n = 1 byte with the result in bit of the conversion for the photoelement 21
x = checksum (complement to one of the Length, Type and Data field bytes sum)
The result of a conversion can be interpreted as follows:
V
Photoelement
[ mV ] = Bit
Photoelement
* 5000 / 255
Note: the 3 less important bits of a conversion [2-0] have to be zeroed before the calculation.
The scanning times vary and depend on different factors such as the number of photoelements, the
serial transmission speed, the measurement type selected and the binary or ASCII data format. The
values can vary from a minimum of 8 reaching a maximum of 90 milliseconds.
The serial transmission parameters are:
Baud-rate Equity Data bits Stop bits
9600
19200
38400
57600
None 8 1