# Delta DVP-12SE Modbus RTU connection issue with Ignition

**URL:** <https://forum.inductiveautomation.com/t/delta-dvp-12se-modbus-rtu-connection-issue-with-ignition/113193>\
**Category:** Ignition\
**Created:** [January 10, 2026, 10:37am UTC](https://forum.inductiveautomation.com/t/delta-dvp-12se-modbus-rtu-connection-issue-with-ignition/113193 "2026-01-10T10:37:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![abhishek.rai](https://avatars.discourse-cdn.com/v4/letter/a/958977/32.png) [@abhishek.rai](https://forum.inductiveautomation.com/u/abhishek.rai)\
**Post date:** [January 10, 2026, 10:37am UTC](https://forum.inductiveautomation.com/t/delta-dvp-12se-modbus-rtu-connection-issue-with-ignition/113193/1 "2026-01-10T10:37:53Z")

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Hello,I am trying to connect my Delta DVP-12SE11T PLC using RS485 with Ignition in the gateway.

I have created the device connection with following properties:

- Serial Port : COM4

- Transfer Mode : ASCII

In PLC there is a simple on off program with M0(NO),M1(NC),M2(NO) memory bits and Y0,Y1 output bits. In order to see the tags(Boolean) in ignition designer for this connection what OPC Item Path should be used. I have tried but didn’t get any data.

However, in modscan64 the M2 bit which has the address 02051 shows to be 1 and also the corresponding output of this Y0 at address 01281 also shows 1.

Also,with the same device when i connected using Modbus TCP protocol everything work fine  
with M0 at C2049,M1 at C2050,M2 at C2051,Y0 at 1281,Y1 at 1282.

Help me to configure the OPC Item Path for Modbus RTU.

 ![IMG_20260108_160549919_HDR_AE (1)](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/b/5b2a44ae65a0053a875f753a0cc3827e83f0070d.jpeg)

 ![IMG_20260108_142642266_HDR_AE](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/b/bba7a0822b0e55e3f9445eb3a6c751aa2c5db161.jpeg)

 ![IMG_20260108_160453980_HDR_AE](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/a/9aa638834312082383c877f333c6a1c0c4b61f2a.jpeg)

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**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [January 10, 2026, 1:31pm UTC](https://forum.inductiveautomation.com/t/delta-dvp-12se-modbus-rtu-connection-issue-with-ignition/113193/2 "2026-01-10T13:31:50Z")

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What OPC Item Paths have you tried?

I would expect something like `[MyDevice]1.C2049` to work if it worked similarly on Modbus TCP, assuming your serial settings are correct.

Speaking of... "Transfer Mode" being "ASCII" is probably wrong... is there an "RTU" option?

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [January 10, 2026, 3:38pm UTC](https://forum.inductiveautomation.com/t/delta-dvp-12se-modbus-rtu-connection-issue-with-ignition/113193/3 "2026-01-10T15:38:03Z")

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Neither my driver nor Kevin's native driver support ASCII transfer mode. You **must** use RTU with 8-bit symbols.