Dell™ C5522QT/C6522QT RS232
External Control
Application
This document defines the communication method for control of the Dell LCD display C5522QT /
C6522QT when using an external controller.
Connectors and wiring
2.1 RS-232C Remote Access
Connector: 9-pin D-Sub
Cable: Straight cable or null modem cable
RS232 Pin Assignment (Facing Display)
This display uses RXD, TXD, and GND lines for RS-232 control.
Note 1: The RS232 cable is not provided by Dell.
2.2 LAN control
Connector: RJ-45 10/100 BASE-T
Cable: Category 5 or higher LAN cable
Note 2: The LAN cable is not provided by Dell
Communication Parameter
3.1 RS-232C Remote access
| 1 | Interface | RS-232C |
| 2 | Baud rate | 9600bps |
| 3 | Data length | 8bits |
| 4 | Parity | None |
| 5 | Stop bit | 1 bit |
3.2 LAN control
| 1 | Communication system | TCP/IP (Internet protocol suite) |
| 2 | Interface | Ethernet |
| 3 | Communication layer | Transport layer (TCP) Using the payload of a TCP segment. |
| 4 | IP address | If you need to change, Default: 10.0.50.100 Please refer “Dell Web Management for Displays” section on the User’s manual. |
| 5 | Port No. | 4661 (Fixed) |
Communication Format
Control Command Syntax
[H0][H1][Len][R/W][Cmd][Data0]…[DataN][Chk]
[H0] = 0x37
[H1] = 0x51
[Len] = Length
[R/W] = Read/Write
Read = 0xEB
Write = 0xEA
[Cmd] = Command
[Data0]…[DataN] = Data0~N
[Chk] = Check Sum
Reply Command Syntax
[H2][H3][Len][Reply][RC][Cmd][Data0]…[DataN][Chk]
[H2] = 0x6F
[H3] = 0x37
[Len] = Length
[Reply] = Reply (0x02)
[RC] = Result Code
0 = Success
1 = Timeout
2 = Parameters Error
3 = Not connected
4 = Other Failure
[Cmd] = Command
[Data0]…[DataN] = Data0~N
[Chk] = Check Sum
Example: Get Display Name
[From PC to Display] = 37, 51, 02, EB, 01, 8E
[From Display to PC] = 6F, 37, 0F, 02, 00, 01, 44, 65, 6C, 6C, 20, 43, 37, 35, 32, 30, 51, 54, 13
CheckSum calculation
Xor byte by byte from first byte to the end of the command data stream.
Control Commands List
Information in this document is subject to change without notice.
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December 2020 Rev. A00
Documents / Resources
 | DELL C5522QT 4K Interactive Touch Monitor [pdf] User Guide C5522QT, C6522QT RS232, 4K Interactive Touch Monitor |
