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I just got a currency discriminator (Carnation CR1500) that can be connected to a receipt printer. There is a modular jack on the back of the machine, but I don't know what kind of cable it needs. It won't accept RJ45 or RJ11 connectors. It's taller and thinner than any RJ port I've seen and there's nothing in the manual about it.

Printer port

Can anyone identify this?

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    \$\begingroup\$ An email to the company might solve this problem \$\endgroup\$ – Voltage Spike Jul 15 '19 at 14:54
  • \$\begingroup\$ @laptop2d: To my experience, companies in the POS industry treat their technical datasheets as trade secrets, not something which enables the end customer using their product. \$\endgroup\$ – Janka Jul 15 '19 at 15:00
  • \$\begingroup\$ @Janka Looks like you might be right. Figuring out which contact is which won't be a problem. Can you post your comment as an answer? \$\endgroup\$ – David Brown Jul 15 '19 at 15:05
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It's most likely an RJ10 (earphone cord) connector with ±5V RS232 on it. That's what common receipt printers accept.

You have to find out yourself which pin is TxD, RxD and GND. In idle state, TxD has -5V against GND.

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