Zilog Z80195 - Manual (Page 38)

4-2
Z80185/195 D EVELOPMENT K IT
U SER ' S M ANUAL
UM951800100
Z ILOG
Serial Interface
The serial I/O pins of the Z80185/195 serial controller are connected to the J9–J13 connector blocks
through RS-232 or RS-422 drivers and receivers. J9–J12 are EIA-570 DB-25 connectors for the three
serial ports (ASCI0, ASCI1, and EMSCC) of the Z80185/195.
Jumper Description
J9 ASCI1, data (TXD and RXD) only, female, DTE or DCE
pinning.
J10 EMSCC, male DTE pinning.
J11 EMSCC, female DCE pinning.
J12 ASCI0, male DTE pinning.
J13 ASCI0, female DCE pinning.
The following option jumpers are associated with the above ports:
Pin
Jumper Numbers Description
J15 2–3 Insert jumper to use J10 or J11 rather than J16 with the
ESCC.
J15 4–5 Insert jumper to use RS-422 signaling on J10 and J10.
Remove to use RS-232.
J15 6–7 Insert jumper to use RS-422 signaling on J12 and J13.
Remove to use RS-232.
To use J9 as RS-232 DTE:
Pin
Jumper Numbers
J8 4–6, 7–9, 8–10
To use J9 as RS-232 DCE:
Pin
Jumper Numbers
J8 4–6, 7–8, 9–10