Omega OSP SERIES Manuel d'utilisateur télécharger pdf (Page 47)

IBM

IBM - PC

+ 5 V

10 µF, 16 V

Ground

IBM

2 16 10

10 µF, 16 V

ICL 232

TSC 232

+ 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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Omega OSP SERIES Manuel d'utilisateur Page 47