Omega OSP SERIES User Manual Page 47

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47
+
IBM
3
2
7
D
B
2
5
IBM - PC
+ 5 V
10 µF, 16 V
10 µF, 16 V
10 µF, 16 V
+
15
8
Rx
Tx
Ground
IBM
IBM
Tx
Rx
6
2 16 10
11
12
14
13
1
3
4
5
+
+
10 µF, 16 V
10 µF, 16 V
ICL 232
TSC 232
Tx
Rx
+ 5 V
Mini-Din
TTL to RS 232 converter
15.3 Communication protocol
The exchange of information when a
OSP
is interconnected with a PC is as it follows.
Serial Interface of PC has to be set to 9600 Baud, 8 bit and No parity.
15.3.1 Computer data request from OSP to PC
Computer OSP
Tx IDNAME Rx IDNAME Proceed if the name is acknowledged
Rx IDNAME Tx IDNAME If not, do not answer
Tx Instruction Rx Instruction
Rx Instruction Tx Instruction
Tx char Rx char
Rx DATA 1 Tx DATA 1
Tx char Rx char
Rx DATA 2 Tx DATA 2
Tx char Rx char
Rx DATA 3 Tx DATA 3
Tx char Rx char
Rx DATA 4 Tx DATA 4
Tx CHKSUM Rx char
Rx CHKSUM Tx CHKSUM
IDNAME, Instruction, DATA 1, DATA 2, DATA 3, DATA 4 and CHKSUM are 8-bit values (1 byte)
Tx CHKSUM = DATA 1+DATA 2+DATA 3+DATA 4 .AND. FF
Rx CHKSUM = DATA 1+DATA 2+DATA 3+DATA 4 .AND. FF
The above is useful to verify correct received data.
The minimum time-out of OSP is 3 seconds.
IDNAME is set to 1.
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