Specifications

C-1
Appendix C. Serial Port Pin Outs
C.1 CS I/O Communications Port
Pin configuration for the CR1000 CS I/O port is listed in TABLE C-1.
TABLE C-1. CS I/O Pin Description
ABR = Abbreviation for the function name.
PIN = Pin number.
O = Signal Out of the CR1000 to a peripheral.
I = Signal Into the CR1000 from a peripheral.
PIN ABR I/O Description
1 5 V O 5V: Sources 5 VDC, used to power peripherals.
2 SG Signal Ground: Provides a power return for pin 1
(5V), and is used as a reference for voltage levels.
3 RING I Ring: Raised by a peripheral to put the CR1000 in
the telecommunications mode.
4 RXD I Receive Data: Serial data transmitted by a peripheral
are received on pin 4.
5 ME O Modem Enable: Raised when the CR1000
determines that a modem raised the ring line.
6 SDE O Synchronous Device Enable: Used to address
Synchronous Devices (SDs), and can be used as an
enable line for printers.
7 CLK/HS I/O Clock/Handshake: Used with the SDE and TXD
lines to address and transfer data to SDs. When not
used as a clock, pin 7 can be used as a handshake
line (during printer output, high enables, low
disables).
8 +12 VDC
9 TXD O Transmit Data: Serial data are transmitted from the
CR1000 to peripherals on pin 9; logic low marking
(0V) logic high spacing (5V) standard asynchronous
ASCII, 8 data bits, no parity, 1 start bit, 1 stop bit,
300, 1200, 2400, 4800, 9600, 19,200, 38,400,
115,200 baud (user selectable).