Bit Effect Default Definition
2^7 n/c 0
2^6 n/c 0
2^5 H0 / H1 0 Half Duplexcontrol(see AT&H)
2^4 Q0 / Q1 0 Echo (Return code) on/off(see
ATQ)
2^3 n/c 0
2^2 &D0 / &D1 1 DTR control line (see AT&D)
2^1 V0 / V1 0 System return code (see ATV)
2^0 E0 / E1 1 command echo (see ATE)
00000101 binary = 5 decimal
S38 UseTC57
Range 0..1
efault 0 D
Store in permanent memory AT&W
The advantage of the TC 57 settings is that on reception of a frame of this format
(from the RS232 line) the frame is immediately sent on to the Ethernet without
having to wait for a timeout. This greatly improves communication speed and
e registers 38-41 are inactive; 1 = register 38-41
S39 TC
he IEC 60870-5-1 and IEC 60870-5-2 norms define four standard frame formats
r the link layer. They are:
= Format FT 1.1
= Format FT 1.2
at FT 2
at FT 3
The Frame w a T 2 and FT 3 have a header of fixed length.
The Frame w varia e a header of fixed length. It
includes “Start chara heck sequence
The user mu elect “Fixed frame
length” and “Header
performance.
efault = 0, this means th(D
active).
type 57
Range 0..3
Default 1
Store in permanent memory AT&W
T
fo
0
1
2 = Form
3 = Form
The transmission frame formats - FT 1.2, FT 2 and FT 3 have a Frame of fixed
length.
ith vari ble length for F
ith ble length for FT 2 and FT 3 hav
cter”, “Length” byte, “User Data” and “C
de values for st s the desired Format and inclu
length” parameters.
Änderungen vorbehalten Stand 09.09.05
ipcas GmbH ipEther232 V11.01 Seite 75 von 150
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