Campbell Scientific CR23X Micrologger - Manual (Page 80)

SECTION 6. 9-PIN SERIAL INPUT/OUTPUT
6-2
TABLE 6.2-1. Pin Description
ABR = Abbreviation for the function name.
PIN = Pin number.
O = Signal Out of the CR10X to a peripheral.
I = Signal Into the CR10X 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 CR10X 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 CR10X 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 CR10X 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, 9600, 76,800 baud (user
selectable).
(ME)
MODEM
(COM200
RF95
SC32A)
FIGURE 6.2-1. Hardware Enabled and Synchronously Addressed Peripherals