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  3. ZTS-3000 analog I/O series

Zhongsheng ZTS-3000 analog I/O series Modbus register map

RS485 analog input/output modules (1 to 8 channels, 0-5 V, 0-10 V, 0/4-20 mA and other ranges), Modbus RTU

  • Official
  • 21 registers
  • Modbus RTU
  • Revision 1 · 2026-10-24

Official: Written from the manufacturer's documentation, but not tested on a device yet. Check the map against the manufacturer's documentation before you write to a live device. Tested it? Report a test.

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Communication

Protocol
Modbus RTU
Unit ID
1
Serial
9600 8N1 · 9600 baud, 8 data bits, none parity, 1 stop bit
Byte / word order
ABCD · bytes big-endian, words high first default
Addresses
0-based

Connection values are defaults: the device may be configured differently.

Map

Registers
13 holding registers, 8 input registers
Groups
3
Translation tables
3
Revision
1 · 2026-10-24
Added
()
File
maps/zhongsheng/zts-3000.mbmap.json · 7 KB · history
SHA-256
6dcea1612d8284dbdbae202e9bc0fd73a9ed08fea098a4230634b0c592d71cd8
Manufacturer
zskjdg.com

Sources and notes

Source: Analog input/output series user manual, RS485 version V2.0 (Zhongsheng Technology, 2019)

  • One map for the whole series: a module has 1 to 8 input and/or output channels, so only the first registers exist on a smaller module.
  • Function codes 03, 04, 06 and 10. Measured values are input registers; output setpoints and settings are holding registers. Output setpoints are not kept after power off; the settings are.
  • Values are unsigned 16-bit with three decimals (raw 1000 = 1.000) when the data format register is 2 (fixed 3 decimals). With another data format the scale in this map is wrong: the manual's variable-decimal format puts the number of decimals in the ten-thousands digit (raw 31000 = 1.000).
  • The manual is inconsistent about the factory data format: section 2.2 calls fixed decimals the factory default, table 2.2 gives a reset value of 0 (variable decimals). Read register 0x3A first and write 2 if needed.
  • On 0/4-20 mA input models the value is the voltage across the 249 ohm input shunt, in V: divide by 249 to get the current in A (1.000 V = 4.016 mA).
  • Address, baud rate, data format and parity take effect after a power cycle.
  • Written from the manufacturer's manual; not tested on a device.
AreaAddressNameTypeAccessUnitScaleDescription
IR 0 uint16 R V ×0.001 Channel 1 measured value (V; on current models the shunt voltage)
IR 1 uint16 R V ×0.001 Channel 2 measured value
IR 2 uint16 R V ×0.001 Channel 3 measured value
IR 3 uint16 R V ×0.001 Channel 4 measured value
IR 4 uint16 R V ×0.001 Channel 5 measured value
IR 5 uint16 R V ×0.001 Channel 6 measured value
IR 6 uint16 R V ×0.001 Channel 7 measured value
IR 7 uint16 R V ×0.001 Channel 8 measured value
HR 10 uint16 RW ×0.001 Channel 1 output setpoint, in V or mA by output type; not kept after power off
HR 11 uint16 RW ×0.001 Channel 2 output setpoint, in V or mA
HR 12 uint16 RW ×0.001 Channel 3 output setpoint, in V or mA
HR 13 uint16 RW ×0.001 Channel 4 output setpoint, in V or mA
HR 14 uint16 RW ×0.001 Channel 5 output setpoint, in V or mA
HR 15 uint16 RW ×0.001 Channel 6 output setpoint, in V or mA
HR 16 uint16 RW ×0.001 Channel 7 output setpoint, in V or mA
HR 17 uint16 RW ×0.001 Channel 8 output setpoint, in V or mA
HR 49 uint16 RW s ×0.001 Interval of unsolicited data frames; 0 = off (factory default)
HR 50 uint16 RW Modbus address; factory default 1
HR 51 uint16 RW Factory default 1 (9600)
HR 58 uint16 RW Decimal format of inputs and outputs; this map assumes 2
HR 61 uint16 RW Factory default 0 (none); 8 data bits and 1 stop bit

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