TDT RZ2, Manual, Page: 466 / 736

10-52 System 3
SH16 Switchable Headstages
A poke component is used to send the resulting value to memory address 51 on the
RZ5 processor or memory address 3 on the RX7. The Poke RPvdsEx component
writes values to a specific device memory location and should be used with care.
Using the Switching Headstage with Other Devices
When using the SH16/SH16-Z with hardware other than a microstimulator system,
connect as follows:
The Serial Control Bit Pattern that controls connection of a given channel to the
Stimulus Isolator can be sent using any 3 digital logic lines that will produce a +3V
logic signal. Circuit design is similar to the example above, designed for use with
the RZ5 and RX7 processors, but must be modified by routing Bit 0, Bit 1, and Bit
2 to the appropriate digital outputs of the device (instead of using the Poke
component).
Note: The serial clock (Bit 2) on the SH16/SH16-Z can be run at a maximum rate of
5 MHz for other devices.
Technical Specifications
SH16/SH16 ‐ Z Pinout Diagrams
PreAmp Connector
For SH16 headstages with serial numbers <2000, the DB25 connector labeled
Preamp must be connected as it supplies power to the headstage. For headstages
with serial numbers >2000, this connector does not need to be connected if the
user is not recording on the non-stimulating channels.
FromBits
Rst=0
b0=0
b1=0
b2=0
[1:5,0]
b3=0
b4=0
b5=0
iOr
N=248
[1:6,0]
Poke
Addr=51
[1:7,0]
Bit0
Bit1
Bit2
Bit0 is the load pulse for loading data
Bit1 is the serial data line
Bit2 is the serial clock for the data
Headstage Relay Register
SH16
RA16PA
Control Stimulator
Preamp
To base station with
fiber optic input
Control device p roduc ing
3V logic signal
Stimulation input to headstage
Headstage Gain
Unity (1x)
Input Impedance
10
14
Ohms