Acer H11h4-ad Motherboard Manual -

If you are upgrading or repairing an Acer desktop containing this board, bookmark this guide. Unlike a generic PDF, this article is updated with community feedback and real-world fixes.

| Problem | Solution | | :--- | :--- | | | You need an Acer 9-pin to standard front panel adapter cable (e.g., eBay search: "Acer front panel adapter"). | | M.2 SSD not detected | Your drive is SATA-based. This board only supports NVMe (PCIe) M.2 – but at slow x1 speed. Better to use a 2.5" SATA SSD. | | New GPU shows black screen | Go to BIOS > Boot > disable "Secure Boot" + enable "CSM" (Compatibility Support Module). Also ensure PSU is adequate (the Acer stock PSU often lacks GPU power cables). | | Fans run at 100% all the time | Enter BIOS > Power > Fan Control – change from "Full Speed" to "Quiet" or "Auto". | | No audio after Windows reinstall | You need the custom Acer Realtek driver (not the generic Realtek one). Download from Acer's support site for your specific PC model. |

If your system fails to POST (Power On Self Test) after a hardware modification or bad BIOS configuration change, you must manually clear the CMOS memory.

2133 MHz / 2400 MHz (Higher speeds like 2666 MHz downclock automatically) Micro-ATX (Custom OEM layout) Storage Ports 2 x SATA III (6.0 Gb/s) connectors Expansion Slots acer h11h4-ad motherboard manual

For traditional 3.5-inch hard drives and 2.5-inch SATA SSDs. Pinout Diagrams and Connector Mapping

Center-top location under the CPU cooler bracket.

Inside BIOS, press or Ctrl+F1 to reveal advanced menus (e.g., XMP, VT-d, Above 4G Decoding). Acer hides these by default. If you are upgrading or repairing an Acer

Note: If you are moving this motherboard to a new retail case, use the Power Switch lead across Pins 6 and 8 to turn on the machine. 4. RAM Installation and Memory Configuration

Leave the battery out for 5 minutes to completely drain the motherboard's volatile memory.

Since Acer often changes OEM pinouts, here is the verified breakout for the . | | New GPU shows black screen |

The is a proprietary micro-ATX motherboard manufactured by ECS (Elitegroup Computer Systems) specifically for Acer’s line of commercial and consumer desktop computers . Most notably, this board serves as the backbone for the Acer Aspire TC-780 , XC-780 , and various Veriton series desktops.

Connecting the front case cables to the motherboard can be challenging due to missing labels. Locate the header on the bottom right corner of the board.

The back panel layout provides standard connectivity for peripherals and display outputs if you are running integrated Intel HD graphics. 2 x USB 2.0 Ports (Black) 4 x USB 3.0 / 3.1 Gen 1 Ports (Blue) 1 x HDMI Port

Acer H11h4-ad Motherboard Manual -

The function code (FC) in the telegram header identifies the telegram type, such as Request telegram (Request or Send/Request) and Acknowledgement or Response telegram (Acknowledgement frame, Response frame). In addition the function code contains the actual transmission function and control information that prevent loss and duplication of messages, or the station type with FDL status.

FC: Function Code Request

Request Telegramm

FCV = Alternating bit switched on

href=»http://profibus.felser.ch/en/funktionscode.htm#aufruffolgebit»>FCB = Alternating bit (from frame count)

0 (0x0)

CV = Clock Value (Clock synchronization)

other

Reserved

0 (0x0)

TE = Time Event (Clock synchronization)

3 (0x3)

SDA_LOW = Send Data Acknowledged — low priority

4 (0x4)

SDN_LOW = Send Data Not acknowledged — low priority

5 (0x5)

SDA_HIGH = Send Data Acknowledged — high priority

6 (0x6)

SDN_HIGH = Send Data Not acknowledged

7 (0x7)

MSRD = Send Request Data with Multicast Reply

9 (0x9)

Request FDL Status

12(0xC)

SRD low = Send and Request Data

13(0xD)

SRD high = Send and Request Data

14(0xE)

Request Ident with reply

15 (0xF)

Request LSAP Status with reply 1)

other

Reserved

1) this value is in the last version of the standard not defined anymore but only reserved

7	6	5	4	3	2	1	0	FC : Function Code Response
	0							Response telegram
0								Reserved
		0	0					Slave
		0	1					Master not ready
		1	0					Master ready, without token
		1	1					Master ready, in token ring
				0 (0x0)				OK
				1 (0x1)				UE = User Error
				2 (0x2)				RR = No resources
				3 (0x3)				RS = SAP not enabled
				8 (0x8)				DL = Data Low (normal case with DP)
				9 (0x9)				NR = No response data ready
				10(0xA)				DH = Data High (DP diagnosis pending)
				12(0xC)				RDL = Data not received and Data Low
				13(0xD)				RDH = Data not received and Data High
				other				Reserved

Frame Count Bit The frame count bit FCB (b5) prevents message duplication by the acknowledging or responding station(responder) and any loss by the calling station (initiator). Excluded from this are requests without acknowledgement (SDN) and FDL Status, Ident and LSAP Status requests.

For the security sequence, the initiator must carry an FCB for each responder. When a Request telegram (Request or Send/Request) is sent to a responder for the first time, or if it is re-sent to a responder currently marked as non-operational, the FCB must be set as defined in the responder. The initiator achieves this in a Request telegram with FCV=0 and FCB=1. The responder must assess a telegram of this kind as the first message cycle and store the FCB=1 together with the initiator’s address (SA) (see following table). This message cycle will not be repeated by the initiator. In subsequent Request telegrams to the same responder, the initiator must set FCV=1 and change the FCB with each new Request telegram. Any responder that receives a Request telegram addressed to it with FCV=1 must evaluate the FCB. If the FCB has changed when compared with the last Request telegram from the same initiator (same SA), this is valid confirmation that the preceding message cycle was concluded properly. If the Request telegram originates from a different initiator (different SA), evaluation of the FCB is no longer necessary. In both cases, the responder must save the FCB with the source SA until receipt of a new telegram addressed to it. In the case of a lost or impaired acknowledgement or response telegram, the FCB must not be changed by the initiator in the request retry: this will indicate that the previous message cycle was faulty. If the responder receives a Request telegram with FCV=1 and the same FCB as the last Request telegram from the same initiator (same SA), this will indicate a request retry. The responder must in turn retransmit the acknowledgement or response telegram held in readiness. Until the above-mentioned confirmation or receipt of a telegram with a different address (SA or DA) that is not acknowledged (Send Data with No Acknowledge, SDN) the responder must hold the last acknowledgement or response telegram in readiness for any possible request retry. In the case of Request telegrams that are not acknowledged and with Request FDL Status, Ident, and LSAP Status, FCV=0 and FCB=0; evaluation by the responder is no longer necessary.

Bit position

FCB

FCV

Condition

Meaning

Action

DA = TS/127

Request without acknowledgement
Request FDL Status/ Ident/ LSAP Status

Delete last acknowledgement

0/1

DA # TS

Request to another responder

Delete last acknowledgement / response

DA = TS

First request

FCBM := 1
SAM := SA
Delete last acknowledgement / response

0/1

DA = TS
SA = SAM
FCB # FCBM

New Request

Delete last acknowledgement / response
FCBM := FCB
Hold acknowledgement / response in readiness for retry

0/1

DA = TS
SA = SAM
FCB = FCBM

Retry Request

FCBM := FCB
Repeat acknowledgement / response and continue to hold in readiness

0/1

DA = TS
SA # SAM

New initiator

FCBM := FCB
SAM := SA Hold acknowledgement / response in readiness for retry

FCBM stored FCB in memory SAM stored SA in memory

Acer H11h4-ad Motherboard Manual -

The FCS (Frame Check Sequence) checksum required in the telegram for Hamming distance 4 is always located directly in front of the end delimiter (ED) and has the following configuration:

7	6	5	4	3	2	1	0
0 to 255								Checksum

For the without-data format (SD1) the checksum must be formed by the arithmetical sum of DA, SA, and FC without start delimiter (SD) or end delimiter (ED) and disregarding sums carried over. For the fixed length format with data (SD3) and the variable length format (SD2) the checksum must also include the payload (PDU). Example of bytes added together in the FCS:

SD2

LEr

SD2

DSAP

SSAP

PDU

FCS

Пн	Вт	Ср	Чт	Пт	Сб	Вс
				1	2	3
4	5	6	7	8	9	10
11	12	13	14	15	16	17
18	19	20	21	22	23	24
25	26	27	28	29	30	31

7	6	5	4	3	2	1	0	DA: Destination address
	0 — 127 (0x7F)							Destination address
0 1								no DSAP (SAP = NIL) DSAP present

7	6	5	4	3	2	1	0	SA : Source address
	0 – 126 (0x7E)							Source address
0 1								no SSAP (SAP = NIL) SSAP present

Acer H11h4-ad Motherboard Manual -

Acer H11h4-ad Motherboard Manual -

Для личного использования. Информация, взятая из сети сопровождается ссылкой на источник

Acer H11h4-ad Motherboard Manual -

Length information

Acer H11h4-ad Motherboard Manual -

Acer H11h4-ad Motherboard Manual -

7	6	5	4	3	2	1	0	LE and LEr: length byte
4 to 249								Length byte