🚀 go-pugleaf

>  I am trying to interface a piece of lab equipment to an IBM serail port. The
> DB25 connector is a current loop and the RS232C is an 8 pin I repeat an 8 pin
> DIN connector. Does any by chance besides guessing the proper pinouts for it.

It might be a S5/8 interface. See e.g. "electronics & wireless world" July 1986 
and August 1986. The pin numbering is:
   1 Data input
   2 Ground
   3 Data output
   4 Handshake input
   5 Handshake output
   6 Subsidiary input (not standardized yet)
   7 Subsidiary output (not standardized yet)
   8 5Volt (out for a D-device, in for an S-device)

A D-device is a self-powered device, able to supply power to the S5/8 
interface. An S-device may draw up to 20mA. A D-device has a (female) 
connector, an S-device has a lead attached to the device with a male connector.

All signals are 0 to 5Volt. All inputs however can cope with up to 25Volt, such 
that the +12V and -12V of an RS232 output. To drive an RS232 input from an S5/8 
output the 5Volt may be too little for reliable operation.

Data format: 1 start bit, 8 databits, 1 stopbit at 9600 bit/s.



Kees  van der Wal				  e-mail: JC_vdWal@pttrnl.nl
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