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SECTION 6
SECS Protocol Specifications
CIDRW System
User’s Manual
SECTION 6
Appendix
Protocol Specifications
• Character composition
Start bit (1) + data bits (8) + stop bit (1)
* Conforms to SEMI E4
• Protocol parameters
• 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.
Sign Name Default setting Setting range
Setting
unit
BAUD Baud Rate 9600 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 -
DEVID Device ID 0 0 to 32767 1
T1 Time-out between characters 0.5 s 0.1 to 10 s 0.1 s
T2 Protocol time-out 10 s 0.2 to 25 s 0.2 s
T3 Response time-out 45 s 1 to 120 s 1 s
T4 Time-out between blocks 45 s 1 to 120 s 1 s
RTY Retry limit 3 0 to 31 1
M/S Master/slave M M: Master
S: Slave
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