# Odd format EGI Nexus 1500+ Meter

**URL:** <https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511>\
**Category:** General\
**Created:** [16 August 2022 16:52 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511 "2022-08-16T16:52:03Z")\
**Posts on this page:** 8\
**Page:** 1

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**Author:** ![HansZnarf](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/hansznarf/32/70215_2.png) [@HansZnarf](https://discourse.nodered.org/u/HansZnarf)\
**Post date:** [16 August 2022 16:52 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/1 "2022-08-16T16:52:03Z")

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I find this really and odd format. Tried playing around with what others have assisted with so far without success. Please see following right out of device manual.

3.7: Type F7- Secondary Voltage, Current, VA, VAR, Watts, Hz or Flicker  
Length: 2 Registers (4 bytes)  
Range: +32767 / -32768  
Unit: 1/65536 V, A, VA, VAR, W or Hz  
The registers together contain a four-byte signed (2's compliment) integer. Positive  
values have the most significant bit clear, and have the same magnitude as an  
unsigned integer. Negative values have the most significant bit set. The magnitude of a negative  
value is found by complementing (inverting) all of the bits and adding 1.

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**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [16 August 2022 18:44 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/2 "2022-08-16T18:44:38Z")

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> [@HansZnarf](#):
>
> The magnitude of a negative  
> value is found by complementing (inverting) all of the bits and adding 1.

That is the normal format for a signed integer. The buffer parser node should convert it for you.

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<div class="post-metadata">

**Author:** ![HansZnarf](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/hansznarf/32/70215_2.png) [@HansZnarf](https://discourse.nodered.org/u/HansZnarf)\
**Post date:** [17 August 2022 14:58 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/3 "2022-08-17T14:58:35Z")

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Colin:

Many thanks: NOTE - will we need to write any code in the buffer parser for this to work?

Thanks,

Hans

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**Author:** ![dynamicdave](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dynamicdave/32/96_2.png) [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)\
**Post date:** [17 August 2022 15:07 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/4 "2022-08-17T15:07:11Z")

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Can I ask, is this thread a continuation of your previous one??  
If it is, then we seem to be covering the same ground again.

> [@Signed Integer showing 3 phase power factor for electrical metering](https://discourse.nodered.org/t/signed-integer-showing-3-phase-power-factor-for-electrical-metering/66250):
>
> This is a signed three phase power factor value. The manual states the following "-100 to +1000 to +100 in 1000th. It is from a 16 bit register. The most significant bit is left as read and is the sign value. When "0" the number is positive. When a "1" it is negative. The most significant value bit is 512 in binary Example 0000\_0011\_1110\_1000 = 1000 and 1000\_0000\_0000\_0001 = -1. Thanks, Hans

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**Author:** ![HansZnarf](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/hansznarf/32/70215_2.png) [@HansZnarf](https://discourse.nodered.org/u/HansZnarf)\
**Post date:** [17 August 2022 17:34 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/5 "2022-08-17T17:34:49Z")

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[  
{  
"id": "b9ea5d5227b5083a",  
"type": "modbustcp-read",  
"z": "ffde3f89549527d7",  
"name": "",  
"topic": "",  
"dataType": "HoldingRegister",  
"adr": "187",  
"quantity": "2",  
"rate": "10",  
"rateUnit": "s",  
"server": "c840a64164607c03",  
"ieeeType": "off",  
"ieeeBE": true,  
"x": 110,  
"y": 40,  
"wires": [  
[  
"3a2182f4ea0b30d3",  
"ee79504be1c1dbe3"  
]  
]  
},  
{  
"id": "3a2182f4ea0b30d3",  
"type": "debug",  
"z": "ffde3f89549527d7",  
"name": "Raw",  
"active": true,  
"tosidebar": true,  
"console": false,  
"tostatus": false,  
"complete": "payload",  
"targetType": "msg",  
"statusVal": "",  
"statusType": "auto",  
"x": 430,  
"y": 100,  
"wires":   
},  
{  
"id": "66ba3472bad9425b",  
"type": "debug",  
"z": "ffde3f89549527d7",  
"name": "Buffered",  
"active": true,  
"tosidebar": true,  
"console": false,  
"tostatus": false,  
"complete": "payload",  
"targetType": "msg",  
"statusVal": "",  
"statusType": "auto",  
"x": 440,  
"y": 40,  
"wires":   
},  
{  
"id": "ee79504be1c1dbe3",  
"type": "buffer-parser",  
"z": "ffde3f89549527d7",  
"name": "",  
"data": "payload",  
"dataType": "msg",  
"specification": "",  
"specificationType": "ui",  
"items": [  
{  
"name": "item1",  
"type": "int16be",  
"offset": 0,  
"length": 1,  
"mask": ""  
}  
],  
"swap1": "",  
"swap2": "",  
"swap3": "",  
"swap1Type": "swap",  
"swap2Type": "swap",  
"swap3Type": "swap",  
"msgProperty": "payload",  
"msgPropertyType": "str",  
"resultType": "keyvalue",  
"resultTypeType": "return",  
"multipleResult": false,  
"fanOutMultipleResult": false,  
"setTopic": true,  
"outputs": 1,  
"x": 290,  
"y": 40,  
"wires": [  
[  
"66ba3472bad9425b"  
]  
]  
},  
{  
"id": "c840a64164607c03",  
"type": "modbustcp-server",  
"name": "N 1500+",  
"host": "10.145.44.200",  
"port": "502",  
"unit\_id": "1",  
"reconnecttimeout": "5"  
}  
]

---

<div class="post-metadata">

**Author:** ![HansZnarf](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/hansznarf/32/70215_2.png) [@HansZnarf](https://discourse.nodered.org/u/HansZnarf)\
**Post date:** [17 August 2022 17:36 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/6 "2022-08-17T17:36:58Z")

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Let me know if I exported this correctly. Note: The modbus read that I am using is listed 4X register minus one. If the published value is 188 I must start at 187. In "our" world the would be JBus.

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<div class="post-metadata">

**Author:** ![HansZnarf](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/hansznarf/32/70215_2.png) [@HansZnarf](https://discourse.nodered.org/u/HansZnarf)\
**Post date:** [17 August 2022 17:41 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/7 "2022-08-17T17:41:58Z")

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![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/c/e/ce95b3f8ffb9073ff288ed922f87b081e1b41c68.png)

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [2 September 2022 17:47 UTC](https://discourse.nodered.org/t/odd-format-egi-nexus-1500-meter/66511/8 "2022-09-02T17:47:49Z")

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