Protocol Specifications - Omron V640 - MANUAL 2 User Manual

SECTION 6
Appendix

Protocol Specifications

• Character composition
Start bit (1) + data bits (8) + stop bit (1)
* Conforms to SEMI E4
• Protocol parameters
Sign
BAUD Baud Rate
DEVID Device ID
T1 Time-out between characters
T2 Protocol time-out
T3 Response time-out
T4 Time-out between blocks
RTY Retry limit
M/S Master/slave
• Double block detection
The header of the block currently being received is compared with the correct block received immedi-
ately before, and double blocks are detected. A setting in the setting mode determines whether this
function is used or not.
• Multi-block
Multi-blocks are supported at the receiving side (maximum of 128 blocks).
Multi-blocks are used at the sending side.
• Message size
The maximum receivable message size is 32 kbytes.
• Interleaving
The receiving side supports interleaving and block interleaving.
The sending side uses interleaving and block interleaving.
The maximum number of simultaneously open transactions is 16. If the maximum number is
exceeded, SxF0 (abort transmission) is sent.
• Device ID
The number of device IDs used is 1. Device IDs are specified in the setting mode.
• Block numbers
With a single block, the block number is either 1 or 0. For multi-block transmission, the numbers 1 to
128 are used. The block number for a single block is set in the setting mode.
• Treatment of the systems byte
The system byte comprises the source ID and the transaction ID.
The source ID is a fixed value and is specified in the setting mode.
The initial value of the transaction ID is 1 and the maximum value is 0xFFFF. The value is incremented
from the first message transmission.
CIDRW System
132
User's Manual
Name Default setting
9600
0
0.5 s
10 s
45 s
45 s
3
M
Setting range
1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 -
0 to 32767
0.1 to 10 s
0.2 to 25 s
1 to 120 s
1 to 120 s
0 to 31
M: Master
S: Slave
Setting
unit
1
0.1 s
0.2 s
1 s
1 s
1
-