I bought a 6610 second hand. I saw references on the forum that this RJ45 USB serial cable was compatible. I already had on hand some CH340/341 USB-TTL devices so I decided to just make my own. I cut off the end of an ethernet cable and soldered the wires to a breakout board. I measured the voltages on them and it doesn't make sense.
The 6610 installation guide, on page 88, says the pinout is:
1 Not supported N/A
2 Not supported N/A
3 UART0_TXD Transmit data
4 GND Logic ground
5 GND Logic ground
6 UART0_RXD Receive data
7 Not supported N/A
8 Not supported N/A
The Amazon product listing also shows a similar pinout (modulo TX/RX):
1 CTS
2 DSR
3 RXD
4 GND
5 GND
6 TXD
7 DTR
8 RTS
9 NC
But when I measure the voltages I see:
1 GND
2 +6.5V
3 +6.5V
4 +6.5V
5 +6.5V
6 GND
7 GND
8 GND
So I'm a bit confused. Pins 4 and 5 are supposed to be the ground pins. Even if I was looking at it upside down, 4 and 5 should still be the ground pins. This is making me worried that the serial port on this device is defective.
I fired up minicom at the recommended settings (9600, 8 bit, no parity, 1 stop bit), hooked up the GND cable to pin 1, and tried attaching my RX to each of the 6.5V pins in series while rebooting. None of them produced any output at all in minicom. I also tried hooking up my GND to ping 4 and my RX to pin 3 per the installation manual but also didn't get any output.
The 6610 installation guide, on page 88, says the pinout is:
1 Not supported N/A
2 Not supported N/A
3 UART0_TXD Transmit data
4 GND Logic ground
5 GND Logic ground
6 UART0_RXD Receive data
7 Not supported N/A
8 Not supported N/A
The Amazon product listing also shows a similar pinout (modulo TX/RX):
1 CTS
2 DSR
3 RXD
4 GND
5 GND
6 TXD
7 DTR
8 RTS
9 NC
But when I measure the voltages I see:
1 GND
2 +6.5V
3 +6.5V
4 +6.5V
5 +6.5V
6 GND
7 GND
8 GND
So I'm a bit confused. Pins 4 and 5 are supposed to be the ground pins. Even if I was looking at it upside down, 4 and 5 should still be the ground pins. This is making me worried that the serial port on this device is defective.
I fired up minicom at the recommended settings (9600, 8 bit, no parity, 1 stop bit), hooked up the GND cable to pin 1, and tried attaching my RX to each of the 6.5V pins in series while rebooting. None of them produced any output at all in minicom. I also tried hooking up my GND to ping 4 and my RX to pin 3 per the installation manual but also didn't get any output.
