YASKAWA GA700 Series Technical Manual page 310

6.3 MEMOBUS/Modbus Communications
Note:
• If the keypad shows CALL [Serial Comm Transmission Error], refer to "Troubleshooting" to remove the cause of the error, and try to
do communications again. If the keypad does not show CALL, check U1-19 [MEMOBUS/Modbus Error Code] for the error and error
type.
• If you execute the write function code when the slave address in the command message is 00 (Hex.), all of the slaves will execute the
write command, but they will not send response messages to the master.
310 YASKAWA SIEPC71061705H GA700 Series Technical Manual