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The baud rate is 9600, 8 data bits, one stop bit, and no parity bit. Each data frame contains 8 bytes. Control command format:
Specifications:
Model: CE039_12V
Product series: RS232
Rated current: 10A
Rated voltage: DC12V
3C rated voltage range: below 36V
Relay load current: Max 10A
Relay load voltage: DC 1-100v or AC85-265v
Weight: 67g
Size: 8.5 x 4.7 x 1.8cm/3.35 x 1.85 x 0.71inch
Package Included: 1 x RS232 Relay
Every time a command is sent, there is a return frame, and the 7th byte in the return frame contains the status of the relay. Return to instruction:
2 return instructions
1. Return to relay on (return to this command, indicating that the relay NO and COM are in the pull-in state)
Relay 1: 33 3C 00 00 00 01 01 71
Relay 2: 33 3C 00 00 00 02 01 72
Relay 3: 33 3C 00 00 00 03 01 73
Relay 4: 33 3C 00 00 00 04 01 74
2. Return to relay off (return to this command, indicating that the relay NO and COM are disconnected)
Relay 1: 33 3C 00 00 00 01 02 72
Relay 2: 33 3C 00 00 00 02 02 73
Relay 3: 33 3C 00 00 00 03 02 74
Relay 4: 33 3C 00 00 00 04 02 75
Seth Robertson
July 16, 2025
It works as described. Note that the device is an RS-232 DCE, so a normal computer (DTE) does not need a null modem but a modem/radio typically will. Further note that serial grounding (as always) can be critical--it didn't work for my debugging without it.It has that "self-locking" mode where NO is connected to COM. Note, however, that this only occurs when the system is powered on. When powered off, COM is connected to NC regardless of the self-locking status.The biggest nit is that, while the interlock mode works great, the REPORTING of it fails. Turn on 1, status reports 1 on. Interlock 2, then status reports ports 1 and 2 on, despite 1 having been turned off in reality.Speaking of status, the sixth byte is used to request the status (2 off, 1 on) of each port just like the other commands. Using the default command they provide (with a port of 0) only returns the status of port 4 AFAIK.If you are developing in python, then the following code fragment will be of use: `struct.pack("BBBBBBBB", 0x55, 0x56, 0x00, 0x00, 0x00, int(relay), int(state), 0xAB + int(relay) + int(state))`
Joe
July 3, 2025
Programming is a little tricky but once you understand it, it works as intended.
Bic Olano
March 11, 2025
After determining that this board required a male-female straight-through serial cable, found it to be working well with my application which is based on PHP sripts.
Customer
December 27, 2024
it's working just fine and as it says, waiting until i start stressing it in the coming 2 weeks, I just wonder if they have a version with less channels
Michael McGrath
November 28, 2024
It appears to work reliably! Thank you!