E10 and H-series PLC do not have ability to initial data via RS232 port. They are only slave and can respond to commands sent to them. Only M-series PLC has that ability to send via RS232 or RS485. If you use a M-series PLC (T100MD888+, for example), it can read the status of another PLC such as E10 or T22H-npn. E10 does not have a published set of host link command so it is actually better to use a T22H-npn. But if cost is a concern then E10 can work with a limited set of ASCII commands.