SUPPORTED MODBUS FUNCTIONS 6. COMMUNICATIONS
6-4
6.2.5
TIMING
Data packet synchronization is maintained by timing constraints. The receiving device must measure the time between the reception of
characters. If three and one half character times elapse without a new character or completion of the packet, then the communication
link must be reset (i.e. all slaves start listening for a new transmission from the master). Thus at 9600 baud a delay of greater than 3.5 *
1/9600 * 10 = 3.65 ms will cause the communication link to be reset.
6.3 SUPPORTED MODBUS FUNCTIONS
6.3.1
SUPPORTED MODBUS FUNCTIONS
The following functions are supported by the SR469:
01 - Read Relay Coil
02 - Read Digital Input Status
03 - Read Setpoints and Actual Values
04 - Read Setpoints and Actual Values
05 - Execute Operation
06 - Store Single Setpoint
07 - Read Device Status
08 - Loopback Test
16 - Store Multiple Setpoints
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