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3-40 B30 Bus Differential System GE Multilin

3.3 DIRECT INPUT AND OUTPUT COMMUNICATIONS 3 HARDWARE

Figure 3–43: TIMING CONFIGURATION FOR RS422 TWO-CHANNEL, THREE-TERMINAL APPLICATION

Data module 1 provides timing to the B30 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 vary by manufacturer.

c) TRANSMIT 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 impor-

tant 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.

Figure 3–44: CLOCK AND DATA TRANSITIONS

Data module 1

Data module 2

Signal name

SD(A) - Send data

TT(A) - Terminal timing

TT(B) - Terminal timing

SD(B) - Send data

RD(A) - Received data

SD(A) - Send data

SD(B) - Send data

RD(B) - Received data

RS(A) - Request to send (RTS)

RT(A) - Receive timing

CS(A) - Clear To send

RT(B) - Receive timing

CS(B) - Clear To send

Local loopback

Remote loopback

Signal ground

ST(A) - Send timing

ST(B) - Send timing

RS(B) - Request to send (RTS)

831022A3.CDR

Shld.

Tx1(+)

Tx2(+)

Tx1(-)

Tx2(-)

Rx1(+)

Rx2(+)

com

Rx1(-)

Rx2(-)

–

INTER-RELAY COMMUNICATIONS

RS422

CHANNEL 1

RS422

CHANNEL 2

CLOCK

SURGE

831733A1.CDR

Tx Clock

Tx Data

Model	b30
Manufacturer	GE
Coil Voltage	N/A (Solid State Relay)
Coil Power	N/A (Solid State Relay)
Mechanical Life	N/A (Solid State Relay)
Electrical Life	N/A (Solid State Relay)

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