Y113 Seven-Segment LED Display Module Technical Manual (RS485)

This document applies to the RS485 version of the Y113. The Y113 family includes submodels with 1 to 6 display digits. For product selection and general specifications, see the Y113 Specification.

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Contents

Section	Description
1	Scope and Submodels
2	Hardware and Electrical Parameters
3	Communication Protocol and Serial Settings
4	Holding Register Map
5	Display Data Organization
6	Modbus Command Examples
7	Commissioning and Parameter Activation Rules
8	Troubleshooting
9	Support and Contact

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1. Scope and Submodels

Series	Submodel	Display Digits	Protocol	Notes
Y113	Y113-1	1 digit	Modbus RTU	Dimensions vary by digit count
Y113	Y113-2	2 digits	Modbus RTU	Same as above
Y113	Y113-3	3 digits	Modbus RTU	Same as above
Y113	Y113-4	4 digits	Modbus RTU	Same as above
Y113	Y113-5	5 digits	Modbus RTU	Same as above
Y113	Y113-6	6 digits	Modbus RTU	Same as above

Item	Description
Interfaces covered by protocol materials	RS485 / RS232 / TTL, depending on the ordered version
Scope of this manual	RS485 version only
RS485 bus capacity	About 32 nodes without repeaters; up to 254 with repeaters

Engineering notes:

• The register map is designed for the maximum 6-digit display capability, using 0000H to 0005H.
• If a submodel has fewer than 6 digits, only the first N digit registers are effective, where N is the display digit count of the submodel. Writes beyond that range usually do not appear on the display.
• For decimal point and flashing bitmaps, use only the valid bits for the installed submodel.

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2. Hardware and Electrical Parameters

2.1 Electrical and Environmental

Parameter	Value
Supply voltage	DC 5 to 36 V
Communication distance	0 to 1200 m, extendable with repeaters
Operating temperature	-40 °C to +85 °C
Operating humidity	0% to 95% RH, non-condensing
Mounting method	Snap-in mounting

2.2 Terminal Definition (4-pin)

Terminal Marking	Meaning on RS485 Version	Notes
+	Power positive
-	Power negative
A/T	RS485 A	Reused as TXD on the TTL version
B/R	RS485 B	Reused as RXD on the TTL version

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3. Communication Protocol and Serial Settings

3.1 Protocol Capability

Item	Description
Protocol	Modbus RTU
Register type	Holding register, 16-bit unsigned
Supported function codes	0x03 Read Holding Registers, 0x06 Write Single Register, 0x10 Write Multiple Registers
Address range	1 to 255, with 0 reserved for broadcast

3.2 Serial Port Parameters

Parameter	Options	Factory Default
Baud rate	4800 / 9600 / 14400 / 19200 / 38400 / 56000 / 57600 / 115200 and up to 128000 / 256000 through register settings	9600
Start bit	1 bit	1 bit
Data bits	8 bits	8 bits
Stop bits	1 / 1.5 / 2	1
Parity	None / Odd / Even	None

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4. Holding Register Map

All addresses below are hexadecimal register addresses, for example 000AH.

Address	Reset Value	R/W	Name	Description	Power-Loss Retention
0000H	0x30	R/W	DIG1	Character for digit 1, ASCII code	Yes
0001H	0x30	R/W	DIG2	Character for digit 2, ASCII code	Yes
0002H	0x30	R/W	DIG3	Character for digit 3, ASCII code	Yes
0003H	0x30	R/W	DIG4	Character for digit 4, ASCII code	Yes
0004H	0x30	R/W	DIG5	Character for digit 5, ASCII code	Yes
0005H	0x30	R/W	DIG6	Character for digit 6, ASCII code	Yes
0006H	0	R/W	DATA_FMT_HI	Combined with 0007H for 24-bit numeric display. In the high byte, the upper nibble is sign control (0 positive, 1 negative), the lower nibble is decimal point count (0 to 5), and the low byte is the highest 8 bits of the 24-bit value.	Yes
0007H	0	R/W	DATA_24_LO	Combined with 0006H. The high byte is the middle 8 bits of the 24-bit value, and the low byte is the lowest 8 bits.	Yes
0008H	0	R/W	FLASH_MASK	Flashing bitmask. bit0 corresponds to digit 1. 1 means flashing.	No
0009H	0	R/W	DISP_SAVE	Display retention. 0 = do not retain, 1 = retain all display content.	Yes
000AH	1	R/W	DEV_ADDR	RS485 slave address. 1 to 255, with 0 as broadcast.	Yes
000BH	1	R/W	BAUD_CFG	Baud rate code. See the table below.	Yes
000CH	0	R/W	STOP_CFG	Stop bits. 0 = 1 bit, 1 = 1.5 bits, 2 = 2 bits.	Yes
000DH	0	R/W	PARITY_CFG	Parity. 0 = None, 1 = Odd, 2 = Even.	Yes
000EH	3	R/W	BRIGHT	Brightness, 0 to 7. 0 is the dimmest and 7 is the brightest.	Yes
000FH	0	R/W	BOOT_MODE	Power-on display. 0 = show 0, 1 = show address, 2 = show retained data.	Yes
0010H	0	R/W	DECIMAL_CNT	Decimal point count	Yes
0011H	0	R/W	SIGN_SET	Sign setting. 0 = positive, 1 = negative, showing the minus sign.	Yes

4.1 Baud Rate Code Table (000BH)

Code	Baud Rate (bps)
0	4800
1	9600
2	14400
3	19200
4	38400
5	56000
6	57600
7	115200
8	128000
9	256000

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5. Display Data Organization

Mode	Registers	Typical Use	Write Method
Per-digit character mode	0000H to 0005H	Display mixed content such as A001, B002, or -12.3	Write ASCII values by digit using 0x06 or 0x10
24-bit numeric mode	0006H + 0007H, optionally with 0010H and 0011H	Display integers, decimals, or signed values directly	0x10 multi-register write is recommended

Item	Rule
Flashing control	Controlled by the 0008H bitmask. Each bit maps to one display digit. 1 means flashing.
Decimal point and sign	Can be encoded in the high byte of 0006H, or configured separately through 0010H and 0011H
Display retention	Controlled by 0009H
Submodel digit-width limit	For Y113-N, only the first N digit registers should be written, where N = 1 to 6

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6. Modbus Command Examples

The request frames below use RTU hexadecimal format. The default slave address is 01, and the CRC values are already included.

6.1 Communication and Runtime Parameter Settings (0x06)

Purpose	Register	Value	Request Frame (Hex)
Change slave address to 2	000AH	0002	01 06 00 0A 00 02 28 09
Set baud rate to 19200	000BH	0003	01 06 00 0B 00 03 B8 09
Set baud rate to 38400	000BH	0004	01 06 00 0B 00 04 F9 CB
Set stop bits to 2	000CH	0002	01 06 00 0C 00 02 C8 08
Set even parity	000DH	0002	01 06 00 0D 00 02 99 C8
Set brightness to 7	000EH	0007	01 06 00 0E 00 07 A9 CB
Set power-on display to address	000FH	0001	01 06 00 0F 00 01 78 09
Enable display retention after power loss	0009H	0001	01 06 00 09 00 01 98 08
Set flashing bitmask, digits 1 and 3 flashing	0008H	0005	01 06 00 08 00 05 C8 0B

6.2 Character Display Commands

Purpose	Function Code	Request Frame (Hex)	Description
Show 1 on digit 1	0x06	01 06 00 00 00 31 48 1E	Writes 0000H = 0x0031
Batch display 1234	0x10	01 10 00 00 00 04 08 00 31 00 32 00 33 00 34 5E A5	Writes 0000H to 0003H continuously

6.3 Numeric Display Commands (0006H + 0007H)

Purpose	Function Code	Request Frame (Hex)	Description
Display 12345 using numeric format	0x10	01 10 00 06 00 02 04 00 00 30 39 A7 97	0006H = 0x0000, 0007H = 0x3039
Display 12.345	0x10	01 10 00 06 00 02 04 03 00 30 39 A7 D3	Lower nibble of the high byte in 0006H is 3, meaning 3 decimal places

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7. Commissioning and Parameter Activation Rules

7.1 Software Commissioning Flow

Step	Action
1	Open the test page for the seven-segment display
2	Select serial settings, typically starting with address 1, 9600, 8N1
3	After a successful connection, run single-digit and batch display tests
4	Configure the slave address, baud rate, stop bits, parity, brightness, and flashing
5	Save the configuration, power-cycle the device, and verify the settings

7.2 Notes on Parameter Activation

Item	Rule
Communication parameter changes	After changing the address, baud rate, stop bits, or parity, the host must switch to the new settings before communication can continue
Parameter retention	After writing retained parameters, verify them again after a restart
Submodel differences	Submodels with different digit counts only differ in visible display width; the protocol is the same
Compatibility	Firmware may vary slightly across production batches, so reading back key parameters is recommended before volume deployment

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8. Troubleshooting

Symptom	Possible Cause	Recommended Action
Cannot connect	Address or serial settings do not match	Return to the default settings of address 1, 9600, 8N1 and check each item in sequence
Requests sent with no response	A/B wiring reversed, poor contact, or serial port occupied	Check wiring polarity and terminal crimping, and close other serial software
Device appears offline after address change	Host is still using the old address	Communicate with the new address, or scan the full address range if necessary
Display content is lost after power-off	Display retention not enabled	Write 0009H = 1, then power-cycle and verify
Flashing does not work	Incorrect 0008H bitmask setting	Check the bit-to-digit mapping, where bit0 corresponds to digit 1
Abnormal display on low-digit submodels	Registers beyond the available digit count were written	For Y113-N, write only the first N digit registers

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9. Support and Contact

Item	Information
Manufacturer	Hunan YenGear Tech Co., Ltd.
Email	[email protected]
Website	www.yengear.com