What is the serial pinout for the M221 Controller?
| Pin | RS232 | RS485 |
| 1 | RxD | N.C. |
| 2 | TxD | N.C. |
| 3 | RTS | N.C. |
| 4 | N.C. | D1 / D+ |
| 5 | N.C. | D0 / D- |
| 6 | CTS | N.C. |
| 7 | N.C. | 5 Vdc |
| 8 | Common | Common |
CTS= Clear to Send
RTS= Ready To Send
RxD= Received Data
TxD= Transmitted Data
N.C.= No Connection
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