The pinout of the integrated Modbus port on M340 CPU's BMXP34 1000/2010/2020 is as follows:
| 1 | RXD |
| 2 | TXD |
| 3 | RTS |
| 4 | D1 |
| 5 | D0 |
| 6 | CTS |
| 7 | Vcc |
| 8 | Com |
| 9 | Shield |
Legacy KB System (APS) Data: RESL187214 V1.0, Originally authored by DaSo on 07/23/2007, Last Edited by DaSo on 07/23/2007
Related ranges: Modicon M340
Released for: Schneider Electric Saudi Arabia
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