GE T35 Instruction Manual page 62

3.3 DIRECT I/O COMMUNICATIONS
3
Figure 3–29: TIMING CONFIGURATION FOR RS422 TWO-CHANNEL, 3-TERMINAL APPLICATION
Data Module 1 provides timing to the T35 RS422 interface via the ST(A) and ST(B) outputs. Data Module 1 also provides
timing to Data Module 2 TT(A) and TT(B) inputs via the ST(A) and AT(B) outputs. The Data Module pin numbers have been
omitted in the figure above since they may vary depending on the manufacturer.
c) TRANSIT TIMING
The RS422 Interface accepts one clock input for Transmit Timing. It is important that the rising edge of the 64 kHz Transmit
Timing clock of the Multiplexer Interface is sampling the data in the center of the Transmit Data window. Therefore, it is
important to confirm Clock and Data Transitions to ensure Proper System Operation. For example, the following figure
shows the positive edge of the Tx Clock in the center of the Tx Data bit.
3-26
Tx1(+) W 2a
Tx1(-) W 3b
RS422
Rx1(+) W 4b
CHANNEL 1
Rx1(-) W 3a
W 6a
Shld.
+ W 7a
CLOCK
-
W 8b
Tx2(+) W 4a
Tx2(-) W 5b
RS422
Rx2(+) W 6b
CHANNEL 2
Rx2(-) W 5a
W 7b
Shld.
com W 2b
W 8a
SURGE
Tx Clock
Tx Data
Figure 3–30: CLOCK AND DATA TRANSITIONS
T35 Transformer Management Relay
Data Module 1
Signal Name
Pin No.
SD(A) - Send Data
SD(B) - Send Data
RD(A) - Received Data
RD(B) - Received Data
RS(A) - Request to Send (RTS)
RS(B) - Request to Send (RTS)
RT(A) - Receive Timing
RT(B) - Receive Timing
CS(A) - Clear To Send
CS(B) - Clear To Send
Local Loopback
Remote Loopback
Signal Ground
ST(A) - Send Timing
ST(B) - Send Timing
Data Module 2
Signal Name
Pin No.
TT(A) - Terminal Timing
TT(B) - Terminal Timing
SD(A) - Sand Data
SD(B) - Sand Data
RD(A) - Received Data
RD(B) - Received Data
RS(A) - Request to Send (RTS)
RS(B) - Request to Send (RTS)
CS(A) - Clear To Send
CS(B) - Clear To Send
Local Loopback
Remote Loopback
Signal Ground
ST(A) - Send Timing
ST(B) - Send Timing
831022A2.CDR
3 HARDWARE
GE Multilin