Instruction manual

4. SETTING
IMR01H02-E3
13
4.3 Communication Requirements
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Processing times during data send/receive
The MA900/MA901 requires the following processing times during data send/receive.
Whether the host computer is using either the polling or selecting procedure for communication, the
following processing times are required for MA900/MA901 to send data:
-Response wait time after MA900/MA901 sends BCC in polling procedure
-Response wait time after MA900/MA901 sends ACK or NAK in selecting procedure
RKC communication (Polling procedure)
Procedure details Time (ms)
MIN TYP MAX
Response send time after MA900/MA901 receives ENQ 1 2 4
Response send time after MA900/MA901 receives ACK 1
−
4
Response send time after MA900/MA901 receives NAK 1
−
4
Response send time after MA900/MA901 sends BCC
−−
1
RKC communication (Selecting procedure)
Procedure details Time (ms)
MIN TYP MAX
Response send time after MA900/MA901 receives BCC 1 2 3
Response wait time after MA900/MA901 sends ACK
−−
1
Response wait time after MA900/MA901 sends NAK
−−
1
Modbus
Procedure details Time
Read holding registers [03H]
Response transmission time after the slave receives the query
message
20 ms max.
Preset single register [06H]
Response transmission time after the slave receives the query
message
3 ms max.
Diagnostics (loopback test) [08H]
Response transmission time after the slave receives the query
message
3 ms max.
Preset multiple registers [10H]
Response transmission time after the slave receives the query
message
20 ms max.
Response send time is time at having set interval time in 0 ms.